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  • 1.
    Adlarson, Patrik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Adolph, C.
    Augustyniak, W.
    Bardan, W.
    Bashkanov, M.
    Bednarski, T.
    Bergmann, F. S.
    Berlowski, M.
    Bhatt, H.
    Brinkmann, K. -T
    Buescher, M.
    Calén, Hans
    Clement, H
    Coderre, D.
    Czerwinski, E.
    Doroshkevich, E.
    Engels, R.
    Erven, W.
    Eyrich, W.
    Fedorets, P.
    Foehl, K.
    Fransson, Kjell
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Goldenbaum, F.
    Goslawski, P.
    Grigoryev, K.
    Gullström, Carl-Oscar
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Hanhart, C.
    Heijkenskjöld, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Heimlich, J.
    Hejny, V.
    Hinterberger, F.
    Hodana, M.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jany, A.
    Jany, B. R.
    Jarczyk, L.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kamys, B.
    Kemmerling, G.
    Khakimova, O.
    Khoukaz, A.
    Kistryn, S.
    Klaja, J.
    Kleines, H.
    Klos, B.
    Kren, F.
    Krzemien, W.
    Kulessa, P.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Lalwani, K.
    Leupold, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Lorentz, B.
    Magiera, A.
    Maier, R.
    Marianski, B.
    Marciniewski, Pawel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Meissner, U-G
    Mikirtychiants, M.
    Morsch, H. -P
    Moskal, P.
    Nandi, B. K.
    Niedzwiecki, S.
    Ohm, H.
    Passfeld, A.
    Pauly, C.
    del Rio, E. Perez
    Petri, T.
    Petukhov, Y.
    Piskunov, N.
    Plucinski, Pawel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Podkopal, P.
    Povtoreyko, A.
    Prasuhn, D.
    Pricking, A.
    Pysz, K.
    Pyszniak, A.
    Rausmann, T.
    Redmer, Cristoph F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ritman, J.
    Roy, A.
    Rudy, Z.
    Sawant, S.
    Schadmand, S.
    Schmidt, A.
    Sefzick, T.
    Serdyuk, V.
    Shah, N.
    Siemaszko, M.
    Siudak, R.
    Skorodko, T.
    Skurzok, M.
    Smyrski, J.
    Sopov, V.
    Stassen, R.
    Stepaniak, J.
    Sterzenbach, G.
    Stockhorst, H.
    Stollenwerk, F.
    Stroeher, H.
    Szczurek, A.
    Taeschner, A.
    Terschlüsen, Carla
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Tolba, T.
    Trzcinski, A.
    Varma, R.
    Vlasov, P.
    Wagner, G. J.
    Weglorz, W.
    Winnemoeller, A.
    Wirzba, A.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Wronska, A.
    Wuestner, P.
    Wurm, P.
    Yuan, X.
    Yurev, L.
    Zabierowski, J.
    Zheng, C.
    Zielinski, M. J.
    Zipper, W.
    Zlomanczuk, Jozef
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Zupranski, P.
    Exclusive measurement of the eta -> pi(+) pi(-) gamma decay2012In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 707, no 2, p. 243-249Article in journal (Refereed)
    Abstract [en]

    An exclusive measurement of the decay eta -> pi(+) pi(-) gamma has been performed at the WASA facility at COSY. The eta mesons were produced in the fusion reaction pd -> He-3 X at a proton beam momentum of 1.7 GeV/c. Efficiency corrected differential distributions have been extracted based on 13 960 +/- 140 events after background subtraction. The measured pion angular distribution is consistent with a relative p-wave of the two-pion system, whereas the measured photon energy spectrum was found at variance with the simplest gauge invariant matrix element of eta -> pi(+) pi(-) gamma. A parameterization of the data can be achieved by the additional inclusion of the empirical pion vector form factor multiplied by a first-order polynomial in the squared invariant mass of the pi(+) pi(-) system.

  • 2.
    Adlarson, Patrik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Adolph, C.
    Augustyniak, W.
    Bashkanov, M.
    Bednarski, T.
    Bergmann, F. S.
    Berlowski, M.
    Bhatt, H.
    Brinkmann, K. -T
    Buescher, M.
    Calén, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Clement, H.
    Coderre, D.
    Czerwinski, E.
    Doroshkevich, E.
    Engels, R.
    Erven, W.
    Eyrich, W.
    Fedorets, P.
    Foehl, K.
    Fransson, Kjell
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Goldenbaum, F.
    Goslawski, P.
    Grigoryev, K.
    Gullström, Carl-Oskar
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Heijkenskjöld, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Heimlich, J.
    Hejny, V.
    Hinterberger, F.
    Hodana, M.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Janusz, M.
    Jany, A.
    Jany, B. R.
    Jarczyk, L.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kamys, B.
    Kemmerling, G.
    Khakimova, O.
    Khoukaz, A.
    Kistryn, S.
    Klaja, J.
    Kleines, H.
    Klos, B.
    Kren, F.
    Krzemien, W.
    Kulessa, P.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Lalwani, K.
    Lorentz, B.
    Magiera, A.
    Maier, R.
    Marianski, B.
    Marciniewski, Pawel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Mikirtychiants, M.
    Morsch, H. -P
    Moskal, P.
    Nandi, B. K.
    Niedzwiecki, S.
    Ohm, H.
    Passfeld, A.
    Pauly, C.
    del Rio, E. Perez
    Petukhov, Y.
    Piskunov, N.
    Plucinski, Pawel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Podkopal, P.
    Povtoreyko, A.
    Prasuhn, D.
    Pricking, A.
    Pysz, K.
    Rausmann, T.
    Redmer, Christoph F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ritman, J.
    Roy, A.
    Rudy, Z.
    Sawant, S.
    Schadmand, S.
    Schmidt, A.
    Sefzick, T.
    Serdyuk, V.
    Shah, N.
    Siemaszko, M.
    Skorodko, T.
    Skurzok, M.
    Smyrski, J.
    Sopov, V.
    Stassen, R.
    Stepaniak, J.
    Sterzenbach, G.
    Stockhorst, H.
    Stroeher, H.
    Szczurek, A.
    Taeschner, A.
    Tolba, T.
    Trzcinski, A.
    Varma, R.
    Vlasov, P.
    Wagner, G. J.
    Weglorz, W.
    Wiedner, U.
    Winnemoeller, A.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Wronska, A.
    Wuestner, P.
    Wurm, P.
    Yuan, X.
    Yurev, L.
    Zabierowski, J.
    Zheng, C.
    Zielinski, M. J.
    Zipper, W.
    Zlomanczuk, Jozef
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Zupranski, P.
    pi(0)pi(0) Production in proton-proton collisions at T-p=1.4 GeV The WASA-at-COSY Collaboration2012In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 706, no 4-5, p. 256-262Article in journal (Refereed)
    Abstract [en]

    The reaction pp -> pp pi(0)pi(0) has been investigated at a beam energy of 1.4 GeV using the WASA-at-COSY facility. The total cross section is found to be (324 +/- 21(systematic) +/- 58(normalization)) mu b. In order to study the production mechanism, differential kinematic distributions have been evaluated. The differential distributions indicate that both initial state protons are excited into intermediate Delta(1232) resonances, each decaying into a proton and a single pion, thereby producing the pion pair in the final state. No significant contribution of the Roper resonance N*(1440) via its decay into a proton and two pions is found.

  • 3.
    Andersson Sundén, Erik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Gustavsson, Cecilia
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Hjalmarsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA.
    Lantz, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Marciniewski, Pawel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA.
    Barker, Abigail
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
    Lundén, Karl
    SLU.
    Citizen Science and Radioactivity2019In: Nuclear Physics News, ISSN 1050-6896, Vol. 29, no 2, p. 25-28Article in journal (Other (popular science, discussion, etc.))
  • 4. Archilli, F.
    et al.
    Babusci, D.
    Badoni, D.
    Balwierz, I.
    Bencivenni, G.
    Bini, C.
    Bloise, C.
    Bocci, V.
    Bossi, F.
    Branchini, P.
    Budano, A.
    Bulychjev, S. A.
    Caldeira Balkeståhl, Li
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Campana, P.
    Capon, G.
    Ceradini, F.
    Ciambrone, P.
    Czerwinski, E.
    Dane, E.
    De Lucia, E.
    De Robertis, G.
    De Santis, A.
    De Zorzi, G.
    Di Domenico, A.
    Di Donato, C.
    Domenici, D.
    Erriquez, O.
    Fanizzi, G.
    Felici, G.
    Fiore, S.
    Franzini, P.
    Gauzzi, P.
    Giardina, G.
    Giovannella, S.
    Gonnella, F.
    Graziani, E.
    Happacher, F.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Iafolla, L.
    Iarocci, E.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kowalewska, A.
    Kulikov, V.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Lee-Franzini, J.
    Loddo, F.
    Mandaglio, G.
    Martemianov, M.
    Martini, M.
    Mascolo, M.
    Matsyuk, M.
    Messi, R.
    Miscetti, S.
    Morello, G.
    Moricciani, D.
    Moskal, P.
    Nguyen, F.
    Passeri, A.
    Patera, V.
    Longhi, I. Prado
    Ranieri, A.
    Redmer, Christoph F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Santangelo, P.
    Sarra, I.
    Schioppa, M.
    Sciascia, B.
    Sciubba, A.
    Silarski, M.
    Stucci, S.
    Taccini, C.
    Tortora, L.
    Venanzoni, G.
    Versaci, R.
    Wislicki, W.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Zdebik, J.
    Search for a vector gauge boson in phi meson decays with the KLOE detector KLOE-2 Collaboration2012In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 706, no 4-5, p. 251-255Article in journal (Refereed)
    Abstract [en]

    The existence of a light dark force mediator has been tested with the KLOE detector at DA Phi NE. This particle, called U. is searched for using the decay chain phi -> eta U, eta -> pi(+)pi(-)pi(0), U -> e(+)e(-). No evidence is found in 1.5 fb(-1) of data. The resulting exclusion plot covers the mass range 5 < M-U < 470 MeV, setting an upper limit on the ratio between the U boson coupling constant and the One structure constant, alpha'/alpha, of <= 2 x 10(-5) at 90% C.L. for 50 < M-U < 420 MeV.

  • 5. Babusci, D.
    et al.
    Badoni, D.
    Balwierz-Pytko, I.
    Bencivenni, G.
    Bini, C.
    Bloise, C.
    Bocci, V.
    Bossi, F.
    Branchini, P.
    Budano, A.
    Caldeira Balkeståhl, Li
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Capon, G.
    Ceradini, F.
    Ciambrone, P.
    Czerwiński, E.
    Dané, E.
    De Lucia, E.
    De Robertis, G.
    De Santis, A.
    De Simone, P.
    Di Domenico, A.
    Di Donato, C.
    Di Micco, B.
    Di Salvo, R.
    Domenici, D.
    Erriquez, O.
    Fanizzi, G.
    Fantini, A.
    Felici, G.
    Fiore, S.
    Franzini, P.
    Gauzzi, P.
    Giardina, G.
    Giovannella, S.
    Gonnella, F.
    Graziani, E.
    Happacher, F.
    Höistad, B.
    Iafolla, L.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Lee-Franzini, J.
    Leverington, B.
    Loddo, F.
    Loffredo, S.
    Mandaglio, G.
    Martemianov, M.
    Martini, M.
    Mascolo, M.
    Messi, R.
    Miscetti, S.
    Morello, G.
    Moricciani, D.
    Moskal, P.
    Nguyen, F.
    Passeri, A.
    Patera, V.
    Prado Longhi, I.
    Ranieri, A.
    Redmer, C. F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Santangelo, P.
    Sarra, I.
    Schioppa, M.
    Sciascia, B.
    Silarski, M.
    Taccini, C.
    Tortora, L.
    Venanzoni, G.
    Versaci, R.
    Wiślicki, W.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Xu, G.
    Zdebik, J.
    Measurement of Γ(η→π+π-γ)/Γ(η→π+π-π0) with the KLOE detector2013In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 718, no 3, p. 910-914Article in journal (Refereed)
    Abstract [en]

    The ratio Rη=Γ(η→π+π-γ)/Γ(η→π+π-π0) has been measured by analysing 22 million φ→ηγ decays collected by the KLOE experiment at DAΦNE, corresponding to an integrated luminosity of 558 pb-1. The η→π+π-γ proceeds both via the ρ resonant contribution, and possibly a non-resonant direct term, connected to the box anomaly. Our result, Rη=0.1856±0.0005stat±0.0028syst, points out a sizable contribution of the direct term to the total width. The di-pion invariant mass for the η→π+π-γ decay could be described in a model-independent approach in terms of a single free parameter, α. The determined value of the parameter α is α=(1.32±0.08stat-0.09syst+0.10±0.02theo) GeV-2.

  • 6. Babusci, D.
    et al.
    Badoni, D.
    Balwierz-Pytko, I.
    Bencivenni, G.
    Bini, C.
    Bloise, C.
    Bossi, F.
    Branchini, P.
    Budano, A.
    Balkestahl, Li Caldeira
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Capon, G.
    Ceradini, F.
    Ciambrone, P.
    Curciarello, F.
    Czerwinski, E.
    Dane, E.
    De Leo, V.
    De Lucia, E.
    De Robertis, G.
    De Santis, A.
    De Simone, P.
    Di Domenico, A.
    Di Donato, C.
    Domenici, D.
    Erriquez, O.
    Fanizzi, G.
    Felici, G.
    Fiore, S.
    Franzini, P.
    Gauzzi, P.
    Giardina, G.
    Giovannella, S.
    Gonnella, F.
    Graziani, E.
    Happacher, F.
    Heijkenskjöld, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Iafolla, L.
    Iarocci, E.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kluge, W.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Lee-Franzini, J.
    Loddo, F.
    Lukin, P.
    Mandaglio, G.
    Martemianov, M.
    Martini, M.
    Mascolo, M.
    Messi, R.
    Miscetti, S.
    Morello, G.
    Moricciani, D.
    Moskal, P.
    Mueller, S.
    Nguyen, F.
    Passeri, A.
    Patera, V.
    Longhi, I. Prado
    Ranieri, A.
    Redmer, C. F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Santangelo, P.
    Sarra, I.
    Schioppa, M.
    Sciascia, B.
    Silarski, M.
    Taccini, C.
    Tortora, L.
    Venanzoni, G.
    Versaci, R.
    Wislicki, W.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Zdebik, J.
    Precision measurement of sigma (e(+)e(-) -> pi(+)pi(-)gamma)/sigma(e(+)e(-) ->mu(+)mu(-)gamma) and determination of the pi(+)pi(-) contribution to the muon anomaly with the KLOE detector2013In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 720, no 4-5, p. 336-343Article in journal (Refereed)
    Abstract [en]

    We have measured the ratio cr (e(+)e(-) -> pi(+)pi(-)gamma)/sigma(e(+)e(-) -> mu(+)mu(-)gamma), with the KLOE detector at DA Phi NE for a total integrated luminosity of similar to 240 pb(-1). From this ratio we obtain the cross section sigma (e(+)e(-) -> pi(+)pi(-)gamma). From the cross section we determine the pion form factor vertical bar F-pi vertical bar(2) and the two-pion contribution to the muon anomaly a(mu) for 0.592< M-pi pi < 0.975 GeV, Delta(pi pi) a(mu) = (385.1 +/- 1.1(stat) +/- 2.7(sys+theo)) x 10(-10). This result confirms the current discrepancy between the Standard Model calculation and the experimental measurement of the muon anomaly. (c) 2013 Elsevier B.V. All rights reserved.

  • 7. Babusci, D.
    et al.
    Badoni, D.
    Balwierz-Pytko, I.
    Bencivenni, G.
    Bini, C.
    Bloise, C.
    Bossi, F.
    Branchini, P.
    Budano, A.
    Balkestahl, Li Caldeira
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Capon, G.
    Ceradini, F.
    Ciambrone, P.
    Czerwinski, E.
    Dane, E.
    De Lucia, E.
    De Robertis, G.
    De Santis, A.
    Di Domenico, A.
    Di Donato, C.
    Di Salvo, R.
    Domenici, D.
    Erriquez, O.
    Fanizzi, G.
    Fantini, A.
    Felici, G.
    Fiore, S.
    Franzini, P.
    Gauzzi, P.
    Giardina, G.
    Giovannella, S.
    Gonnella, F.
    Graziani, E.
    Happacher, F.
    Heijkenskjöld, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Iafolla, L.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Lee-Franzini, J.
    Leverington, B.
    Loddo, F.
    Loffredo, S.
    Mandaglio, G.
    Martemianov, M.
    Martini, M.
    Mascolo, M.
    Messi, R.
    Miscetti, S.
    Morello, G.
    Moricciani, D.
    Moskal, P.
    Nguyen, F.
    Passeri, A.
    Patera, V.
    Longhi, I. Prado
    Ranieri, A.
    Redmer, C. F.
    Santangelo, P.
    Sarra, I.
    Schioppa, M.
    Sciascia, B.
    Silarski, M.
    Taccini, C.
    Tortora, L.
    Venanzoni, G.
    Wislicki, W.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Zdebik, J.
    Measurement of eta meson production in gamma gamma interactions and Gamma(eta -> gamma gamma) with the KLOE detector2013In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 1, p. 119-Article in journal (Refereed)
    Abstract [en]

    We present a measurement of eta meson production in photon-photon interactions produced by electron-positron beams colliding with root s = 1 GeV. The measurement is done with the KLOE detector at the phi-factory DA Phi NE with an integrated luminosity of 0.24 fb(-1). The e(+)e(-) -> e(+)e(-)eta cross section is measured without detecting the outgoing electron and positron, selecting the decays eta -> pi(+)pi(-)pi(0) and eta -> pi(0)pi(0)pi(0). The most relevant background is due to e(+)e(-) -> eta gamma when the monochromatic photon escapes detection. The cross section for this process is measured as sigma(e(+)e(-) -> eta gamma) = (856 +/- 8(stat) +/- 16(syst)) pb. The combined result for the e(+)e(-) -> e(+)e(-)eta cross section is sigma(e(+)e(-) -> e(+)e(-)eta) = (32.72 +/- 1.27(stat) +/- 0.70(syst)) pb. From this we derive the partial width Gamma(eta -> gamma gamma) = (520 +/- 20(stat) +/- 13(syst)) eV. This is in agreement with the world average and is the most precise measurement to date.

  • 8. Babusci, D.
    et al.
    Badoni, D.
    Balwierz-Pytko, I.
    Bencivenni, G.
    Bini, C.
    Bloise, C.
    Bossi, F.
    Branchini, P.
    Budano, A.
    Balkestahl, Li Caldeira
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Capon, G.
    Ceradini, F.
    Ciambrone, R.
    Curciarello, F.
    Czerwiriski, E.
    Dane, E.
    De Leo, V.
    De Lucia, E.
    De Robertis, G.
    De Santis, A.
    Di Domenico, A.
    Di Donato, C.
    Di Salvo, R.
    Domenici, D.
    Erriquez, O.
    Fanizzi, G.
    Fantini, A.
    Felici, G.
    Fiore, S.
    Franzini, P.
    Gauzzi, P.
    Giardina, G.
    Giovannella, S.
    Gonnella, F.
    Graziani, E.
    Happacher, F.
    Heijkenskjöld, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Iafolla, L.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kacprzak, K.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Lee-Franzini, J.
    Leverington, B.
    Loddo, F.
    Loffredo, S.
    Mandaglio, G.
    Martemianov, M.
    Martini, M.
    Mascolo, M.
    Messi, R.
    Miscetti, S.
    Morello, G.
    Moricciahi, D.
    Moskal, P.
    Nguyen, F.
    Passeriu, A.
    Patera, V.
    Longhi, I. Prado
    Ranieri, A.
    Redmer, C. F.
    Santangelo, P.
    Sarra, I.
    Schioppa, M.
    Sciascia, B.
    Silarski, M.
    Taccini, C.
    Tortora, L.
    Venanzoni, G.
    Wislicki, W.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Zdebik, J.
    A new limit on the CP violating decay K-S -> 3 pi(0) with the KLOE experiment2013In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 723, no 1-3, p. 54-60Article in journal (Refereed)
    Abstract [en]

    We have carried out a new direct search for the CP violating decay K-S -> 3 pi(0) with 1.7 fb(-1) of e(+)e(-) collisions collected by the KLOE detector at the Phi-factory DA Phi NE. We have searched for this decay in a sample of about 5.9 x 10(8) KSKL events tagging the K-S by means of the K-L interaction in the calorimeter and requiring six prompt photons. With respect to our previous search, the analysis has been improved by increasing of a factor four the tagged sample and by a more effective background rejection of fake K-S tags and spurious clusters. We find no candidates in data and simulated background samples, while we expect 0.12 standard model events. Normalizing to the number of K-S -> 2 pi(0) events in the same sample, we set the upper limit on BR(K-S -> 3 pi(0)) <= 2.6 x 10(-8) at 90% C.L., five times lower than the previous limit. We also set the upper limit on the eta(000) parameter, vertical bar eta(000)vertical bar <= 0.0088 at 90% C.L., improving by a factor two the latest direct measurement. (c) 2013 Elsevier B.V. All rights reserved.

  • 9. Babusci, D.
    et al.
    Badoni, D.
    Balwierz-Pytko, I.
    Bencivenni, G.
    Bini, C.
    Bloise, C.
    Bossi, F.
    Branchini, P.
    Budano, A.
    Balkeståhl, Li Caldeira
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Capon, G.
    Ceradini, F.
    Ciambrone, P.
    Czerwinski, E.
    Dane, E.
    De Lucia, E.
    De Robertis, G.
    De Santis, A.
    Di Domenico, A.
    Di Donato, C.
    Di Salvo, R.
    Domenici, D.
    Erriquez, O.
    Fanizzi, G.
    Fantini, A.
    Felici, G.
    Fiore, S.
    Franzini, P.
    Gauzzi, P.
    Giardina, G.
    Giovannella, S.
    Gonnella, F.
    Graziani, E.
    Happacher, F.
    Heijkenskjöld, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Iafolla, L.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Lee-Franzini, J.
    Leverington, B.
    Loddo, F.
    Loffredo, S.
    Mandaglio, G.
    Martemianov, M.
    Martini, M.
    Mascolo, M.
    Messi, R.
    Miscetti, S.
    Morello, G.
    Moricciani, D.
    Moskal, P.
    Nguyen, F.
    Passeri, A.
    Patera, V.
    Longhi, I. Prado
    Ranieri, A.
    Redmer, C. F.
    Santangelo, P.
    Sarra, I.
    Schioppa, M.
    Sciascia, B.
    Silarski, M.
    Taccini, C.
    Tortora, L.
    Venanzoni, G.
    Wislicki, W.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Zdebik, J.
    Limit on the production of a light vector gauge boson in phi meson decays with the KLOE detector2013In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 720, no 1-3, p. 111-115Article in journal (Refereed)
    Abstract [en]

    We present a new limit on the production of a light dark-force mediator with the KLOE detector at DA Phi NE. This boson, called U, has been searched for in the decay phi -> eta U, U -> e(+)e(-), analyzing the. decay eta -> pi(0)pi(0)pi(0) in a data sample of 1.7 fb(-1). No structures are observed in the e(+)e(-) invariant mass distribution over the background. This search is combined with a previous result obtained from the decay eta -> pi(+)pi(-)pi(0), increasing the sensitivity. We set an upper limit at 90% C.L. on the ratio between the U boson coupling constant and the fine structure constant of alpha'/alpha < 1.7 x 10(-5) for 30 < M-U < 400 MeV and alpha'/alpha <= 8 x 10(-6) for the sub-region 50 < M-U <210 MeV. This result assumes the Vector Meson Dominance expectations for the phi eta gamma* transition form factor. The dependence of this limit on the transition form factor has also been studied.

  • 10. Babusci, D.
    et al.
    Balwierz-Pytko, I.
    Bencivenni, G.
    Bloise, C.
    Bossi, F.
    Branchini, P.
    Budano, A.
    Balkestahl, L. Caldeira
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Capon, G.
    Ceradini, F.
    Ciambrone, P.
    Curciarello, F.
    Czerwinski, E.
    Dane, E.
    De Leo, V.
    De Lucia, E.
    De Robertis, G.
    De Santis, A.
    De Simone, P.
    Di Cicco, A.
    Di Domenico, A.
    Di Donato, C.
    Di Salvo, R.
    Domenici, D.
    Erriquez, O.
    Fanizzi, G.
    Fantini, A.
    Felici, G.
    Fiore, S.
    Franzini, P.
    Gajos, A.
    Gauzzi, P.
    Giardina, G.
    Giovannella, S.
    Graziani, E.
    Happacher, F.
    Heijkenskjold, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kacprzak, K.
    Kaminska, G. D.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Lee-Franzini, J.
    Loddo, F.
    Loffredo, S.
    Mandaglio, G.
    Martemianov, M.
    Martini, M.
    Mascolo, M.
    Messi, R.
    Miscetti, S.
    Morello, G.
    Moricciani, D.
    Moskal, R.
    Nguyen, F.
    Palladino, A.
    Passeri, A.
    Patera, V.
    Longhi, I. Prado
    Ranieri, A.
    Santangelo, R.
    Sarra, I.
    Schioppa, M.
    Sciascia, B.
    Silarski, M.
    Taccini, C.
    Tortora, L.
    Venanzoni, G.
    Wislicki, W.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Zdebik, J.
    Test of CPT and Lorentz symmetry in entangled neutral kaons with the KLOE experiment2014In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 730, p. 89-94Article in journal (Refereed)
    Abstract [en]

    Neutral kaon pairs produced in phi decays in anti-symmetric entangled state can be exploited to search for violation of CPT symmetry and Lorentz invariance. We present an analysis of the CP-violating process phi -> KSKL -> pi(+)pi(-)pi(+)pi(-) based on 1.7 fb(-1) of data collected by the KLOE experiment at the Frascati phi-factory DA Phi NE. The data are used to perform a Measurement of the CPT-violating parameters Delta a(mu) for neutral kaons in the context of the Standard Model Extension framework. The parameters measured in the reference frame of the fixed stars are: Delta a(0) = (-6.0 +/- 7.7(stat)+/- 3.1(syst)) X 10(-18) GeV, Delta a(x) = (0.9 +/- 1.5(stat)+/- 0.6(syst)) X 10(-18) GeV, Delta a(y) = (-2.0 +/- 1.5(stat)+/- 0.5(syst)) X 10(-18) GeV, Delta a(z) = (3.1 +/- 1.7(stat)+/- 0.5(syst)) X 10(-18) GeV. These are presently the most precise measurements in the quark sector of the Standard Model Extension. (C) 2014 The Authors. Published by Elsevier B.V.

  • 11. Bargholtz, Chr.
    et al.
    Bashkanov, M.
    Berlowski, M.
    Bondar, A.
    Bogoslawsky, D.
    Brodowski, W.
    Brudvik, J.
    Calén, Hans
    Uppsala University, The Svedberg Laboratory.
    Capellaro, Filippo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Chilingarov, A.
    Clement, H.
    Comfort, J.
    Demiroers, L.
    Ekström, Curt
    Uppsala University, The Svedberg Laboratory.
    Fransson, Kjell
    Uppsala University, The Svedberg Laboratory.
    Fridén, Carl-Johan
    Uppsala University, The Svedberg Laboratory.
    Geren, L.
    Gornov, M.
    Grebenev, V.
    Greiff, J.
    Gurov, Y.
    Gustafsson, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Ivanov, G.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Jiganov, E.
    Johansson, A.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Keleta, S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Khakimova, O.
    Khoukaz, A.
    Kilian, K.
    Kimura, N.
    Koch, I.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kolachev, G.
    Kren, F.
    Kullander, Sven
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kuzmin, A.
    Kuznetsov, A.
    Lindberg, K.
    Marciniewski, Pawel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Meier, R.
    Messner, O.
    Morosov, B.
    Nawrot, A.
    Nefkens, B. M. K.
    Norman, G.
    Uppsala University, The Svedberg Laboratory.
    Oelert, W.
    Pauly, C.
    Pettersson, H.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Pivovarov, A.
    Patzold, J.
    Petukhov, Y.
    Povtorejko, A.
    Reistad, Dag
    Uppsala University, The Svedberg Laboratory.
    Ruber, Roger J. M. Y.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Sandukovsky, S.
    Schönning, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Scobel, W.
    Sefzick, T.
    Shafigullin, R.
    Shwartz, B.
    Sidorov, V.
    Skorodko, T.
    Sopov, V.
    Starostin, A.
    Stepaniak, J.
    Sukhanov, A.
    Sukhanov, A.
    Tchernyshev, V.
    Tegner, P-E
    Engblom, P. Thorngren
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Tikhomirov, V.
    Toki, H.
    Turowiecki, A.
    Wagner, G. J.
    Wiedner, Ulrich
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Wilhelmi, Z.
    Wolke, M.
    Yamamoto, A.
    Yamaoka, H.
    Zabierowski, J.
    Zartova, I.
    Zlomanczuk, Josef
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    The WASA detector facility at CELSIUS2008In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 594, no 3, p. 339-350Article in journal (Refereed)
    Abstract [en]

    The WASA 4 pi multidetector system, aimed at investigating light meson production in light ion collisions and eta meson rare decays at the CELSIUS storage ring in Uppsala is presented. A unique feature of the system is the use of hydrogen pellets as internal targets for the first time. A detailed description of the design, together with the anticipated and achieved performance parameters are given. (C) 2008 Elsevier B.V. All rights reserved.

  • 12. Bashkanov, M.
    et al.
    Abdel-Samad, S.
    Brinkmann, K.
    Calen, Hans
    Uppsala University, Interfaculty Units, The Svedberg Laboratory.
    Capellaro, Filippo
    Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Clement, H.
    Demiroers, L.
    Doroshkevich, E.
    Dshemuchadse, S.
    Ekström, Curt
    Uppsala University, Interfaculty Units, The Svedberg Laboratory.
    Erhardt, A.
    Eyrich, W.
    Fransson, Kjell
    Uppsala University, Interfaculty Units, The Svedberg Laboratory.
    Freiesleben, H.
    Fritch, M.
    Gillitzer, G.
    Gustafsson, Leif
    Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Höistad, Bo
    Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Jacewicz, Marek
    Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Johansson, Tord
    Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Karsch, L.
    Keleta, Samson
    Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Kilian, K.
    Koch, Inken
    Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Kress, J.
    Kuhlmann, E.
    Kullander, Sven
    Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Kupsc, Andrzej
    Uppsala University, Interfaculty Units, The Svedberg Laboratory.
    Marcello, S.
    Marciniewski, Pawel
    Uppsala University, Interfaculty Units, The Svedberg Laboratory.
    Meier, R.
    Möller, K.
    Morozov, B.
    Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Morsch, H.P.
    Pauli, C.
    Pethukov, Y.
    Rodenburg, E.
    Schönmeier, P.
    Schroder, W.
    Schulte-Wissermann, M.
    Scobel, W.
    Sefzick, T.
    Skorodko, T.
    Stepaniak, J.
    Wagner, G.J.
    Wagner, M.
    Wiedner, Ulrich
    Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Wintz, P.
    Wuestner, P.
    Zabierowski, J.
    Zlomanczuk, Jozef
    Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Zupranski, P.
    Two-pion production in proton-proton collisions2004In: Hadron Spectroscopy, Tenth International Conference on Hadron Spectrscopy, Aschaffenburg, Germany 31 August - 6 September 2003, 2004, p. 241-244Conference paper (Other scientific)
  • 13. Bashkanov, M.
    et al.
    Bogoslawsky, D.
    Calén, Hans
    Uppsala University, The Svedberg Laboratory.
    Capellaro, Filippo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Clement, H.
    Demirörs, L.
    Ekström, Curt
    Uppsala University, The Svedberg Laboratory.
    Fransson, Kjell
    Uppsala University, The Svedberg Laboratory.
    Gustafsson, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Ivanov, G.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Jiganov, E.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Keleta, Samson
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Koch, Inken
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear and Particle Physics.
    Kullander, Sven
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kupsc, Andrzej
    Uppsala University, The Svedberg Laboratory.
    Kuznetsov, A.
    Marciniewski, Pawel
    Uppsala University, The Svedberg Laboratory.
    Meier, R.
    Morosov, B.
    Oelert, W.
    Pauly, C.
    Petukhov, Y.
    Pettersson, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Povtorejko, A.
    Ruber, Roger J. M. Y.
    Uppsala University, The Svedberg Laboratory.
    Schönning, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Scobel, W.
    Skorodko, T.
    Shwartz, B.
    Sopov, V.
    Stepaniak, J.
    Tchernyshev, V.
    Thörngren Engblom, Pia
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Tikhomirov, V.
    Turowiecki, A.
    Wagner, G.J.
    Wiedner, Ulrich
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Yamamoto, A.
    Zabierowski, J.
    Zlomanczuk, Jozef
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Measurement of the slope parameter for the η → 3π0 decay in the pp → ppη reaction2007In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 76, no 4, p. 048201-Article in journal (Refereed)
    Abstract [en]

    The CELSIUS-WASA setup is used to measure the 3π0 decay of η mesons produced in pp interactions with beam kinetic energies of 1.36 and 1.45 GeV. The efficiency-corrected Dalitz plot and density distributions for this decay are shown, together with a fit of the quadratic slope parameter α yielding α = −0.026 ± 0.010(stat) ± 0.010(syst). This value is compared to recent experimental results and theoretical predictions.

  • 14.
    Bashkanov, M.
    et al.
    Physikalisches Institut der Universität Tübingen, D-72076 Tübingen, Germany.
    Bogoslawsky, D.
    Joint Institute for Nuclear Research, Dubna, Russia.
    Calén, Hans
    Uppsala University, The Svedberg Laboratory.
    Cappellaro, F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Clement, H.
    Physikalisches Institut der Universität Tübingen, D-72076 Tübingen, Germany.
    Demiroers, L.
    Hamburg University, Hamburg, Germany.
    Ekström, Curt
    Uppsala University, The Svedberg Laboratory.
    Fransson, Kjell
    Uppsala University, The Svedberg Laboratory.
    Greiff, J.
    Uppsala University, The Svedberg Laboratory.
    Gustafsson, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Ivanov, G.
    Joint Institute for Nuclear Research, Dubna, Russia.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Jiganov, E.
    Joint Institute for Nuclear Research, Dubna, Russia.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Khakimova, O.
    Physikalisches Institut der Universität Tübingen, D-72076 Tübingen, Germany.
    Kaskulov, M. M.
    Physikalisches Institut der Universität Tübingen, D-72076 Tübingen, Germany.
    Keleta, Samson
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Koch, I.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Kren, F.
    Physikalisches Institut der Universität Tübingen, D-72076 Tübingen, Germany.
    Kullander, Sven
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Kupsc, Andrzej
    Uppsala University, The Svedberg Laboratory.
    Kuznetsov, A.
    Joint Institute for Nuclear Research, Dubna, Russia.
    Marciniewski, Pawel
    Uppsala University, The Svedberg Laboratory.
    Meier, R.
    Physikalisches Institut der Universität Tübingen, D-72076 Tübingen, Germany.
    Morosov, B.
    Joint Institute for Nuclear Research, Dubna, Russia.
    Oelert, W.
    Forschungszentrum Jülich, Germany.
    Pauly, C.
    Hamburg University, Hamburg, Germany.
    Petukho, Y.
    Joint Institute for Nuclear Research, Dubna, Russia.
    Povtorejko, A.
    Joint Institute for Nuclear Research, Dubna, Russia.
    Ruber, Roger
    Uppsala University, The Svedberg Laboratory.
    Scobel, W.
    Hamburg University, Hamburg, Germany.
    Skorodko, T.
    Physikalisches Institut der Universität Tübingen, D-72076 Tübingen, Germany.
    Shwartz, B.
    Budker Institute of Nuclear Physics, Novosibirsk, Russia.
    Sopov, V.
    Institute of Theoretical and Experimental Physics, Moscow, Russia.
    Stepaniak, J.
    Soltan Institute of Nuclear Studies, Warsaw and Lodz, Poland.
    Tchernyshev, V.
    Institute of Theoretical and Experimental Physics, Moscow, Russia.
    Thorngren-Engblom, Pia
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Tikhomirov, V.
    Joint Institute for Nuclear Research, Dubna, Russia.
    Turowiecki, A.
    Institute of Experimental Physics, Warsaw, Poland.
    Wagner, G. J.
    Physikalisches Institut der Universität Tübingen, D-72076 Tübingen, Germany.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Yamamoto, A.
    High Energy Accelerator Research Organization, Tsukuba, Japan.
    Zabierowski, J.
    Soltan Institute of Nuclear Studies, Warsaw and Lodz, Poland.
    Zlomanczuk, Jozef
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Exclusive measurements of pd -> He-3 pi pi: The ABC effect revisited2006In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 637, no 4-5, p. 223-228Article in journal (Refereed)
    Abstract [en]

    Exclusive measurements of the reactions pd -> He-3 pi(+)7 pi(-) and pd -> He-3 pi(0)pi(0) have been carried out at T-p = 0.893 GeV at the CELSIUS storage ring using the WASA detector. The pi(+)pi(-) channel evidences a pronounced enhancement at low invariant pi pi masses-as anticipated from previous inclusive measurements of the ABC effect. This enhancement is seen to be even much larger in the isoscalar pi(0)pi(0) channel. The differential distributions prove this enhancement to be of scalar-isoscalar nature. Delta Delta calculations give a good description of the data, if a boundstate condition is imposed for the intermediate Delta Delta system.

  • 15.
    Bashkanov, M.
    et al.
    Physikalisches Institut, Universität Tübingen.
    Calèn, Hans
    Uppsala University, The Svedberg Laboratory.
    Cappellaro, F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Ekström, Curt
    Uppsala University, The Svedberg Laboratory.
    Fransson, Kjell
    Uppsala University, The Svedberg Laboratory.
    Gustafsson, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Keleta, Samson
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Koch, I.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kullander, Sven
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kupść, Andrzej
    Uppsala University, The Svedberg Laboratory.
    Marciniewski, Pawel
    Uppsala University, The Svedberg Laboratory.
    Ruber, Roger
    Uppsala University, The Svedberg Laboratory.
    Thörngren-Engblom, Pia
    Uppsala University, The Svedberg Laboratory.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Zlomanczuk, Jozef
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Low-mass pi pi enhancement in baryonic pi pi production: ABC effect revised by exclusive measurements2007In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 22, no 2-3, p. 625-628Article in journal (Refereed)
    Abstract [en]

    The ABC effect - a puzzling threshold enhancement in the ππ invariant mass spectrum of double-pionic fusion to nuclear bound states - has been investigated since 40 years by inclusive measurements without providing a conclusive interpretation. First exclusive measurements to this topic have now been carried out at CELSIUS-WASA. They confirm a huge ππ threshold enhancement, prove it to be of scalar-isoscalar nature, i.e., a σ-channel phenomenon and reveal the theoretically predicted high-mass enhancement in inclusive spectra to be of πππ rather than of ππ nature - falsifying thus corresponding model predictions for the ABC effect. From the kinematically complete data samples we infer that the interaction between the two Δ particles created in this process is of crucial importance.

  • 16.
    Bhattacharyya, Anirban
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Dancila, Dragos
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Eriksson, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Fransson, Kjell
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Gajewski, Konrad
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Goryashko, Vitaliy
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hermansson, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jönsson, Åke
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Li, Han
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Lofnes, Tor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Santiago Kern, Rocio
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Wedberg, Rolf
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    ESS RF Source and Spoke Cavity Test Plan2015Report (Other academic)
    Abstract [en]

    This report describes the test plan for the first high power RF source, ESS prototype double spoke cavity and ESS prototype cryomodule at the FREIA Laboratory.

  • 17.
    Borgmann, Ch.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ögren, Jim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    The Momentum Distribution Of The Decelerated Drive Beam In Clic And The Two-Beam Test Stand At Ctf32014In: Proceedings of IPAC2014, Dresden, Germany., 2014, p. 62-64Conference paper (Other academic)
  • 18.
    Calen, Hans
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Fransson, Kjell
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Gustafsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Hoistad, Bo
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Jacewicz, Marek
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Johansson, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Keleta, Samson
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Kullander, Sven
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Kupsc, Andrzej
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Marciniewski, Pawel
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Petterson, Henrik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Schonning, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Thorngren, Pia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Zlomanczuk, Jozef
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Evidence for a 'Narrow' Roper Resonance - The Breathing Mode of the Nucleon2006Report (Other scientific)
  • 19.
    Calen, Hans
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Fransson, Kjell
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Gustafsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Hoistad, Bo
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Jacewicz, Marek
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Johansson, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Keleta, Samson
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Kullander, Sven
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Kupsc, Andrzej
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Marciniewski, Pawel
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Petterson, Henrik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Schonning, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Thorngren, Pia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Zlomanczuk, Jozef
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Measurement of the eta->pi+ pi- e+ e- decay branching ration2006Report (Other scientific)
  • 20.
    Calen, Hans
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Fransson, Kjell
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Gustafsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Hoistad, Bo
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Jacewicz, Marek
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Johansson, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Keleta, Samson
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Kullander, Sven
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Kupsc, Andrzej
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Marciniewski, Pawel
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Petterson, Henrik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Schonning, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Thorngren, Pia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Zlomanczuk, Jozef
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Two-Pion Production in Nucleon-Nucleon Collisions and the ABC Effect - Approaching a Puzzle by Exclusive and Kinematically Complete Measurements2006Report (Other (popular scientific, debate etc.))
  • 21.
    Calen, Hans
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Fransson, Kjell
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Gustafsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Hoistad, Bo
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Jacewicz, Marek
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Johansson, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Keleta, Samson
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Kullander, Sven
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Kupsc, Andrzej
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Marciniewski, Pawel
    Ruber, Roger
    Interfaculty Units, The Svedberg Laboratory.
    Thörngren, Pia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Zlomanczuk, Jozef
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    On the pipi production in free and in-medium NN-collisions: sigma-channel low-mass enhancement and pi0pi0/pi+pi- asymmetry2006In: Acta Physica Slovaca, Vol. 56, no 3, p. 285-297Article in journal (Refereed)
  • 22.
    Cappellaro, F.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Gustafsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Hoistad, Bo
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Jacewicz, Marek
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Johansson, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Keleta, Samson
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Kullander, Sven
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Thorngren Engblom, Pia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Wiedner, Ulrich
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Wolke, Magnus
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Zlomanczuk, Jozef
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Calen, Hans
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    Ekstrom, Curt
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    Fransson, Kjell
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    Kupsc, Andrzej
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    Marciniewski, Pawel
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    Ruber, Roger
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    TWO-PION PRODUCTION, GAMMA GAMMA LINE AND ASPECTS OF SIGMA MESON, BOSE-EINSTEIN CORRELATIONS AND ISOSPIN BREAKING.2005In: 10th International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2004), Beijing, China, 29 Aug - 4 Sep 2004., 2005, p. 6-Conference paper (Refereed)
  • 23.
    Cappellaro, F.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Johansson, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Gustafsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Hoistad, Bo
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Jacewicz, Marek
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Keleta, Samson
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Kullander, Sven
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Thorngren Engblom, Pia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Wiedner, Ulrich
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Wolke, Magnus
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Zlomanczuk, Jozef
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics. kärnfysik.
    Calen, Hans
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    Ekstrom, Curt
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    Fransson, Kjell
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    Kupsc, Andrzej
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    Marciniewski, Pawel
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    Ruber, Roger
    Interfaculty Units, The Svedberg Laboratory. Department of Physics and Astronomy, Nuclear Physics.
    EXCLUSIVE MEASUREMENTS OF PD ---> HE-3 PI PI: THE ABC EFFECT REVISITED2005Other (Other scientific)
  • 24.
    Eriksson, Johan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA.
    Cryosystem for DC spark experiments: Construction and acceptance tests2019Report (Other academic)
  • 25.
    Farabolini, Wilfrid
    et al.
    CEA/DSM/IRFU Saclay, France.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Muranaka, Tomoko
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Palaia, Andrea
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Two Beam Test Stand Experiments in the CTF3 Facility2011Conference paper (Refereed)
    Abstract [en]

    The CLEX building in the CTF3 facility is the placewhere essential experiments are performed to validate theTwo-Beam Acceleration scheme upon which the CLICproject relies. The Drive Beam enters the CLEX hall afterbeing recombined in the Delay loop and the CombinerRing in intense beam trains of 24 A – 120 MeV lasting140 ns and bunched at 12 GHz, although other beamparameters are also accessible. This beam is thendecelerated in dedicated structures installed in the TestBeam Line (TBL) and in the Two-Beam Test Stand(TBTS) aimed at delivering bursts of 12 GHz RF power.In the TBTS this power is used to generate a highaccelerating gradient of 100 MV/m in specially designedaccelerating structures. To assess the performances ofthese structures a probe beam is used, produced by asecond Linac. We report here various experimentsconducted in the TBTS making use of the versatility ofthe probe beam and of dedicated diagnostics.

  • 26.
    Hamberg, Mathias
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Dancila, Dragos
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Ögren, Jim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Kuittinen, M.
    Institute of Photonics, University of Eastern Finland, Finland.
    Vartiainen, I.
    Institute of Photonics, University of Eastern Finland, Finland.
    Dielectric Laser Acceleration Setup Design, Grating Manufacturing and Investigations Into Laser Induced RF Cavity Breakdowns2017In: Proceedings of FEL2017, Santa Fe, NM, USA, 2017Conference paper (Refereed)
  • 27.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA.
    Dark currents studies with the Uppsala X-band Spectrometer at XBox test stand at CERN2019Report (Other academic)
    Abstract [en]

    Vacuum arcs is the phenomenon which limits the performance of normal conducting acceleratorcavities. It closely depends on electron field emission, which is consider a precursor for the creationof a vacuum discharge. These processes are still not fully understood, but we know that theydepend on the physical properties of the surfaces and bulk materials used in the acceleratorstructures. We need to come at these problems with a multidisciplinary approach, comprisingaccelerator, material and surface physics, for both experimental and theoretical analysis.The field emission current emitted during operation of the RF cavity is typically refer to as thedark current. Behavior of the dark current can give useful information about changes inside thestructure during conditioning and thus into the physics of the vacuum arcs. The Uppsala groupuses a magnetic spectrometer to look at the changes, both spatially on the screen and by measuringthe energy spectrum of the escaping electrons during conditioning of CLIC X-band structuresin dedicated high-power RF test stand at CERN. The spectrometer was originally designedto measure the electrons from the breakdown events with much higher intensities than the darkcurrent signals. In this paper we present the attempt to measure the dark current with the samesetup.

  • 28.
    Jacewicz, Marek
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Borgmann, Ch.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ruber, R.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Kovermann, J.
    Novel Diagnostics for Breakdown Studies2013In: Proceedings of IBIC2013, Oxford, UK, 2013, p. 287-290Conference paper (Other academic)
  • 29.
    Jacewicz, Marek
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Borgmann, Christopher
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ögren, Jim
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    General-purpose spectrometer for vacuum breakdown diagnostics for the 12 GHz test stand at CERN2014Conference paper (Other academic)
  • 30.
    Jacewicz, Marek
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Fransson, Kjell
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Hermansson, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Estimation of radiation levels during high power RF cavity tests in FREIA2014Report (Other academic)
  • 31.
    Jacewicz, Marek
    et al.
    Uppsala University.
    Höistad, Bo
    Uppsala University.
    Proceedings of the Second International Workshop on Eta Meson Physics2007Other (Other scientific)
  • 32.
    Jacewicz, Marek
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Kärnfysik.
    Kupsc, Andrzej
    Interfaculty Units, The Svedberg Laboratory.
    Analysis of eta decay into pi+pi-e+e- in pd->3He eta reaction2006In: Acta Physica Slovaca: ETA 2005 Conference, 2006Conference paper (Refereed)
  • 33.
    Jacewicz, Marek
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Kupsc, Andrzej
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
    Analysis of eta decay into pi+pi-e+e- in the pd->3He+eta reaction2006In: Acta Physica Slovaca, Vol. 56, no 3, p. 367-372Article in journal (Refereed)
  • 34.
    Jacewicz, Marek
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Dubrovskiy, A.
    CERN, CH-1211 Geneva 23, Switzerland.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Spectrometers for RF breakdown studies for CLIC2016In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 828, p. 63-71Article in journal (Refereed)
    Abstract [en]

    An e(+)e(-) collider of several TeV energy will be needed for the precision studies of any new physics discovered at the LHC collider at CERN. One promising candidate is CLIC, a linear collider which is based on a two-beam acceleration scheme that efficiently solves the problem of power distribution to the acceleration structures. The phenomenon that currently prevents achieving high accelerating gradients in high energy accelerators such as the CLIC is the electrical breakdown at very high electrical field. The ongoing experimental work within the CLIC collaboration is trying to benchmark the theoretical models focusing on the physics of vacuum breakdown which is responsible for the discharges. In order to validate the feasibility of accelerating structures and observe the characteristics of the vacuum discharges and their eroding effects on the structure two dedicated spectrometers are now commissioned at the high-power test-stands at CERN. First, the so called Flashbox has opened up a possibility for non-invasive studies of the emitted breakdown currents during two-beam acceleration experiments. It gives a unique possibility to measure the energy of electrons and ions in combination with the arrival time spectra and to put that in context with accelerated beam, which is not possible at any of the other existing test-stands. The second instrument, a spectrometer for detection of the dark and breakdown currents, is operated at one of the 12 GHz stand-alone test-stands at CERN. Built for high repetition rate operation it can measure the spatial and energy distributions of the electrons emitted from the acceleration structure during a single RF pulse. Two new analysis tools: discharge impedance tracking and tomographic image reconstruction, applied to the data from the spectrometer make possible for the first time to obtain the location of the breakdown inside the structure both in the transversal and longitudinal direction thus giving a more complete picture of the vacuum breakdown phenomenon.

  • 35.
    Jacewicz, Marek
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Dubrovskiy, Alexey
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Spectrometers for RF breakdown studies for CLIC2016Report (Other academic)
    Abstract [en]

    A e+e- collider of several TeV energy will be needed for the precision studies of any new physics discovered atthe LHC collider at CERN.  One promising candidate is CLIC, a linear collider which is based on a two-beam acceleration scheme that efficiently solves the problem of power distribution to the acceleration structures. The phenomenon that currently prevents achieving highaccelerating gradients in high energy accelerators such asthe CLIC is the electrical breakdown at very high electrical field.The ongoing experimental work within the CLIC collaboration is trying to benchmark the theoretical models focusing on the physics of vacuum breakdown which is responsible for the discharges. In order to validate the feasibility of accelerating structures and observe the characteristics of the vacuum discharges and their eroding effects on the structure two dedicated spectrometers are now commissioned at the high-power test-stands at CERN. First, the so called Flashbox has opened up a possibility for non-invasive studies of  the emitted breakdown currents during two-beam acceleration experiments. It gives an unique possibility to measure the energy of electrons and ions in combination withthe arrival time spectra and to put that in context with accelerated beam, which is not possible at any of the other existing test-stands.The second instrument, a spectrometer for detection of the dark and breakdown currents, is operated at one of the 12 GHz stand-alone test-stands at CERN.  Built for high repetition rate operation it can measure the spatial and energy distributions of the electrons emitted from the acceleration structure during a single RF pulse. Two new analysis tools: discharge impedance tracking and tomographic image reconstruction, applied to the data from the spectrometer make possible for the first time to obtain the location of the breakdown inside the structure both in the transversal and longitudinal direction thus giving a more complete picture of the vacuum breakdown phenomenon.

  • 36.
    Khakimova, O.
    et al.
    Physikalisches Institut, Universität Tüubingen.
    Calèn, Hans
    Uppsala University, The Svedberg Laboratory.
    Cappellaro, F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Ekström, Curt
    Uppsala University, The Svedberg Laboratory.
    Fransson, Kjell
    Uppsala University, The Svedberg Laboratory.
    Gustafsson, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Keleta, Samson
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Koch, I.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kullander, Sven
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kupsc, Andrzej
    Uppsala University, The Svedberg Laboratory.
    Marciniewski, Pawel
    Uppsala University, The Svedberg Laboratory.
    Ruber, Roger
    Uppsala University, The Svedberg Laboratory.
    Thörngren-Engblom, Pia
    Uppsala University, The Svedberg Laboratory.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Zlomanczuk, Jozef
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Observation of the abc effect in the first exclusive measurements of pn -> d pi(0)pi(0)2007In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 22, no 2-3, p. 617-620Article in journal (Refereed)
    Abstract [en]

    The reaction pn → dπ0π0 constitutes the most fundamental system for the study of the ABC effect - a puzzling threshold enhancement in the ππ invariant mass spectrum of the ππ system in double-pionic fusion to nuclear bound states. The first exclusive measurements of this reaction have now been carried out at CELSIUS-WASA. They exhibit a striking low-mass enhancement in the ππ invariant mass spectrum, prove it to be a σ-channel phenomenon and falsify conventional theoretical models, which predict an associated high-mass enhancement not present in the new exclusive data. In the kinematically complete data sample we observe a ΔΔ excitation, where the interaction between the two Δ obviously plays a crucial role for the generation of the ππ low-mass enhancement.

  • 37.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Bhattacharyya, Anirban
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Dancila, Dragos
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Eriksson, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Fransson, Kjell
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Gajewski, Konrad
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Goryashko, Vitaliy
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Hermansson, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Holz, Michael
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Jobs, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Jönsson, Åke
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Li, Han
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Lofnes, Tor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Nicander, Harald
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Santiago Kern, Rocio
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Wedberg, Rolf
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Yogi, Ruthambara
    European Spallation Source.
    PROGRESS AT THE FREIA LABORATORY2015In: Proceedings of IPAC'15, JACoW: The Joint Accelerator Conferences Website , 2015Conference paper (Refereed)
    Abstract [en]

    The FREIA Facility for Research Instrumentation and Accelerator Development at Uppsala University, Sweden, has reached the stage where the testing of superconducting cavities for the European Spallation Source (ESS) is starting. The new helium liquefaction plant has been commissioned and now supplies a custom-made, versatile horizontal cryostat, HNOSS, with liquid helium at up to 140 l/h. The cryostat has been designed and built to house up to two accelerating cavities, or, later on, other superconducting equipment such as magnets or crab cavities. A prototype cavity for the spoke section of the ESS linac will arrive mid 2015 for high-power testing in the horizontal cryostat. Two tetrode-based commercial RF power stations will deliver 400 kW peak power each, at 352 MHz, to the cavity through an RF distribution line developed at FREIA. In addition, significant progress has been made with in-house development of solid state amplifier modules and powercombiners for future use in particle accelerators. We report here on these and other ongoing activities at the FREIA laboratory.

  • 38.
    Palaia, Andrea
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Muranaka, Tomoko
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Farabolini, Wilfrid
    CEA/DSM/IRFU, Saclay, France.
    RF-breakdown Kicks at the CTF3 Two-beam Test Stand2012Conference paper (Refereed)
    Abstract [en]

    The measurement of the effects of RF-breakdown on the beam in CLIC prototype accelerator structures is one of the key aspects of the CLIC two-beam acceleration scheme being addressed at the Two-beam Test Stand (TBTS) at CTF3. RF-breakdown can randomly cause energy loss and transverse kicks to the beam. Transverse kicks have been measured by means of a screen intercepting the beam after the accelerator structure. In correspondence of a RF-breakdown we detect a double beam spot which we interpret as a sudden change of the beam trajectory within a single beam pulse. To time-resolve such effect, the TBTS has been equipped with five inductive Beam Position Monitors (BPMs) and a spectrometer line to measure both relative changes of the beam trajectory and energy losses. Here we discuss the methodology used and we present the latest results of such measurements.

  • 39.
    Palaia, Andrea
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Farabolini, Wilfrid
    CEA/DSM/IRFU Saclay, France.
    Effects of rf breakdown on the beam in the Compact Linear Collider prototype accelerator structure2013In: Physical Review Special Topics. Accelerators and Beams, ISSN 1098-4402, E-ISSN 1098-4402, Vol. 16, no 8, p. 081004-Article in journal (Refereed)
    Abstract [en]

    Understanding the effects of rf breakdown in high-gradient accelerator structures on the acceleratedbeam is an extremely relevant aspect in the development of the Compact Linear Collider (CLIC) andis one of the main issues addressed at the Two-beam Test Stand at the CLIC Test Facility 3 at CERN.During a rf breakdown high currents are generated causing parasitic magnetic fields that interact withthe accelerated beam affecting its orbit. The beam energy is also affected because the power is partlyreflected and partly absorbed thus reducing the available energy to accelerate the beam. We discusshere measurements of such effects observed on an electron beam accelerated in a CLIC prototypestructure. Measurements of the trajectory of bunch trains on a nanosecond time scale showed fastchanges in correspondence of breakdown that we compare with measurements of the relative beamspots on a scintillating screen. We identify different breakdown scenarios for which we offer anexplanation based also on measurements of the power at the input and output ports of the acceleratorstructure. Finally we present the distribution of the magnitude of the observed changes in the beamposition and we discuss its correlation with rf power and breakdown location in the acceleratorstructure.

  • 40.
    Pauly, C.
    et al.
    Institut für Experimentalphysik der Universität Hamburg.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Koch, Inken
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Bashkanov, M.
    Bogoslawsky, D.
    Calén, Hans
    Uppsala University, The Svedberg Laboratory.
    Capellaro, Filippo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Clement, H.
    Ekström, Curt
    Uppsala University, The Svedberg Laboratory.
    Fransson, Kjell
    Uppsala University, The Svedberg Laboratory.
    Gustafsson, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Ivanov, G.
    Jiganov, E.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Keleta, Samson
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kullander, Sven
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kupsc, Andrzej
    Uppsala University, The Svedberg Laboratory.
    Kuznetsov, A.
    Marciniewski, Pawel
    Uppsala University, The Svedberg Laboratory.
    Meier, R.
    Morosov, B.
    Oelert, W.
    Petukhov, Y.
    Pettersson, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Povtorejko, A.
    Ruber, Roger J.M.Y
    Uppsala University, The Svedberg Laboratory.
    Schönning, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Scobel, W.
    Skorodko, T.
    Shwartz, B.
    Sopov, V.
    Stepaniak, J.
    Tchernyshev, V.
    Thörngren Engblom, Pia
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Tikhomirov, V.
    Turowiecki, A.
    Wagner, G.J.
    Wiedner, Ulrich
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Yamamoto, A.
    Zabierowski, J.
    Zlomanczuk, Jozef
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    The ppppπππ reaction channels in the threshold region2007In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 649, no 2-3, p. 122-127Article in journal (Refereed)
    Abstract [en]

    The cross section for direct neutral and charged three pion production in pp interactions was measured at excess energies in the range 160–216 MeV. That comprises the first measurement of the ppppπ0π0π0 reaction and the direct comparison with the ppppπ+ππ0 process. The experiment was performed above the η meson production threshold and the cross section could be directly normalized to the cross section of the ppppη reaction, with the η decaying into 3 pions. Since the same final states are selected, the measurement has a low systematical error. The measured cross section ratio σ(ppppπ+ππ0)/σ(ppppπ0π0π0) is compared to predictions of dominance of different isobars in the intermediate state.

  • 41. Pauly, C.
    et al.
    Jacewicz, Marek
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Koch, Inken
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Calen, Hans
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Capellaro, Filippo
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Fransson, Kjell
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Gustafsson, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Höistad, Bo
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Johansson, Tord
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Keleta, Samson
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Kullander, Sven
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Kupsc, Andrzej
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Marciniewski, Pawel
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Pettersson, Henrik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Schönning, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Thörngren, Pia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    Zlomanczuk, Jozef
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Department of Physics and Astronomy, Nuclear Physics.
    The p p -> p p pi pi pi reaction channels in the threshold region2007Report (Other scientific)
  • 42.
    Pyszniak, Andrzej
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Calén, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Fransson, Kjell E. I.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics. Uppsala University, The Svedberg Laboratory.
    Fridén, Carl-Johan
    Uppsala University, The Svedberg Laboratory.
    Hellbeck, Elin
    Uppsala University, The Svedberg Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Marciniewski, Pawel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Rudy, Z.
    A pellet tracking system for the PANDA experiment2014In: Hyperfine Interactions, ISSN 0304-3843, E-ISSN 1572-9540, Vol. 229, no 1-3, p. 159-163Article in journal (Refereed)
    Abstract [en]

    Frozen microspheres of hydrogen (pellets) will be one of the target types for the future hadron physics experiment PANDA at FAIR (GSI, Darmstadt, Germany) [1]. Pellets with a diameter of 25- mum are generated about 3 meters above the interaction region, to which they travel with a velocity around 80 m/s inside a narrow pipe. The interaction region is defined by the overlap of the pellet stream and the accelerator beam and has a size of a few millimeters. One would like to know the interaction point more precisely, to have better possibilities to reconstruct particle tracks and events e.g. in charmonium decay studies. One would also like to suppress background events that do not originate in a pellet, but e.g. may occur in rest gas, that is present in the beam pipe. A solution is provided by the presented pellet tracking system together with a target operation mode that provides one and only one pellet in the interaction region most of the time. The goal is to track individual pellets in order to know their position with a resolution of a few tenths of a millimeter at the time of an interaction. The system must also be highly efficient and provide tracking information for essentially all pellets that pass the interaction region. Presented results from the design studies show that the goals can be fulfilled by this solution.

  • 43.
    Ruber, Roger
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Yogi, Rutambhara
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Dancila, Dragos
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Gajewski, Konrad
    Uppsala University, The Svedberg Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Goryashko, Vitaliy
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hermansson, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Lofnes, Tor
    Uppsala University, The Svedberg Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Santiago Kern, Rocio
    Uppsala University, The Svedberg Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Wedberg, Rolf
    Uppsala University, The Svedberg Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Tests of the Spoke Cavity RF Source and Cryomodules in Uppsala: ESS TDR Contribution2012Report (Other academic)
  • 44. Skorodko, T
    et al.
    Bashkanov, M
    Bogoslawsky, D
    Calèn, Hans
    Uppsala University, The Svedberg Laboratory.
    Clement, H
    Doroshkevich, E
    Demiroers, L
    Ekström, Curt
    Uppsala University, The Svedberg Laboratory.
    Fransson, Kjell
    Uppsala University, The Svedberg Laboratory.
    Gustafsson, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Ivanov, G
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Jiganov, E
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Khakimova, O
    Keleta, Samson
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Koch, Inken
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kren, F
    Kullander, Sven
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kupsc, Andrzej
    Uppsala University, The Svedberg Laboratory.
    Marciniewski, Pawel
    Uppsala University, The Svedberg Laboratory.
    Meier, R
    Morosov, B
    Pauly, C
    Petrén, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Petukhov, Y
    Povtorejko, A
    Ruber, Roger J. M. Y.
    Uppsala University, The Svedberg Laboratory.
    Schönning, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Scobel, W
    Shwartz, B
    Stepaniak, J
    Thörngren-Engblom, Pia
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Tikhomirov, V
    Wagner, G.J.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Yamamoto, A
    Zabierowski, J
    Zlomanczuk, Jozef
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Two-pion production in proton-proton collisions: experimental total cross sections and their isospin decomposition2009In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 679, no 1, p. 30-35Article in journal (Refereed)
    Abstract [en]

    The two-pion production in pp-collisions has been investigated at CELSIUS in exclusive measurements from threshold up to T-P = 1.36 GeV. Total and differential Cross sections have been obtained for the channels pn pi(+)pi(0), pp pi(+)pi(-), pp pi(0)pi(0) and also nn pi(+)pi(+). For intermediate incident energies T-P > 1GeV, i.e. in the region which is beyond the Roper excitation but at the onset of Delta Delta excitation, the total pp pi(0)pi(0) cross section falls behind theoretical predictions by as much as all order of magnitude near 1.2 GeV, whereas the nn pi(+)pi(+) cross section is a factor of five larger than predicted. An isospin decomposition of the total cross sections exhibits a s-channel-like energy dependence in the region of the Roper excitation as well as a significant contribution of an isospin 3/2 resonance other than the Delta(1232). As possible candidates the Delta(1600) and the Delta(1700) are discussed. (C) 2009 Elsevier B.V. All rights reserved.

  • 45. Skorodko, T.
    et al.
    Bashkanov, M.
    Bogoslawsky, D.
    Calén, Hans
    Uppsala University, The Svedberg Laboratory.
    Clement, H.
    Doroshkevich, E.
    Demiroers, L.
    Ekström, Curt
    Uppsala University, The Svedberg Laboratory.
    Fransson, Kjell
    Uppsala University, The Svedberg Laboratory.
    Gustafsson, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ivanov, G.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Jiganov, E.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Khakimova, O.
    Keleta, Samson
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Koch, Inken
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Kren, F.
    Kullander, Sven
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Marciniewski, Pawel
    Uppsala University, The Svedberg Laboratory.
    Meier, R.
    Morosov, B.
    Pauly, C.
    Petrén, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Petukhov, Y.
    Povtorejko, A.
    Ruber, Roger J. M. Y.
    Uppsala University, The Svedberg Laboratory.
    Schönning, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Scobel, W.
    Shwartz, B.
    Stepaniak, J.
    Thörngren-Engblom, Pia
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Tikhomirov, V.
    Wagner, G. J.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Yamamoto, A.
    Zabierowski, J.
    Zlomanczuk, Jozef
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Exclusive measurement of the pp -> nn pi(+)pi(+) reaction at 1.1 GeV2011In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 47, no 9, p. 108-Article in journal (Refereed)
    Abstract [en]

    First exclusive data for the pp -> nnp(+)pi(+) reaction have been obtained at CELSIUS with the WASA detector setup at a beam energy of T(p) - 1.1 GeV. Total and differential cross-sections disagree with theoretical calculations, which predict the Delta Delta excitation to be the dominant process at this beam energy. Instead, the data require the excitation of one of the nucleons to a higher-lying Delta state, preferably the Delta(1600)P(33), to be the leading process.

  • 46.
    Skorodko, T.
    et al.
    Physikalisches Institut, Universität Tübingen.
    Calèn, Hans
    Uppsala University, The Svedberg Laboratory.
    Cappellaro, F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Ekström, Curt
    Uppsala University, The Svedberg Laboratory.
    Fransson, Kjell
    Uppsala University, The Svedberg Laboratory.
    Greiff, Jan
    Uppsala University, The Svedberg Laboratory.
    Gustafsson, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Höistad, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Keleta, Samson
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Koch, I.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kullander, Sven
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Kupsc, Andrzej
    Uppsala University, The Svedberg Laboratory.
    Marciniewski, Pawel
    Uppsala University, The Svedberg Laboratory.
    Ruber, Roger
    Uppsala University, The Svedberg Laboratory.
    Thörngren-Engblom, Pia
    Uppsala University, The Svedberg Laboratory.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Zlomanczuk, Jozef
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    pi pi production in proton-proton collisions2007In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 22, no 2-3, p. 509-513Article in journal (Refereed)
    Abstract [en]

    At CELSIUS-WASA the two-pion production in proton-proton collisisons has been measured exclusively from threshold up to the energy regime, where both of the collision partners are expected to be excited to the Δ state. The measurements constitute the first kinematically complete data samples of solid statistics in this energy range. Most of the data have been obtained for the π+π- and π0π0channels. Whereas at near-threshold energies the differential distributions can be succesfully explained by chiral dynamics and Roper excitation, respectively, the data for the π+π- channel in the ΔΔ region can be described only, if the special configuration (ΔΔ)0+ is assumed. The data for the π0π0 channel moreover exhibit a low-mass enhancement in the π0π0 invariant mass spectrum, which is reminiscent of the ABC-effect found in double-pionic fusion to light nuclei.

1 - 46 of 46
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