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  • 1. Broy, Yvonne
    et al.
    Matsson, Ingvar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Reaction Kinetics of Oxidation and Hydriding Inside Operating Fuel Rods1999In: OECD Halden Reactor Project Work Report Series, no HWR-602, p. iv+29-Article in journal (Refereed)
  • 2. Fäldt, Göran
    et al.
    Stenmark, Mårten
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    The production of theta baryons in proton-deuteron collisions near thresholdArticle in journal (Refereed)
  • 3. Grapengiesser, Björn
    et al.
    Matsson, Ingvar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Schrire, David
    Fission Gas Release in ABB SVEA-96/100 Fuel1997In: Proceedings from the TopFuel '97 Conference, Manchester, UK, June 9-11, 1997, 1997, p. 9-Chapter in book (Other academic)
  • 4.
    Keleta, Samson
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Double Pion Production in the dd to αππ reaction2008Doctoral thesis, monograph (Other academic)
    Abstract [en]

    The reaction dd → 4Heππ has been measured exclusively for the first time. The measurements were performed at Td = 712 MeV and Td = 1029 MeV, with the WASA detector assembly at CELSIUS (Uppsala-Sweden). The aim was to investigate a long standing puzzle, the so called ABC effect. This is a peculiar feature of double pion production in light nuclei collisions. In addition to confirming previous experimental observations in this regard, our results also reveal a strong angular dependence of the pions in the overall center of mass system as well as non-isotropic angular distribution of the low mass enhancement in the ππ invariant mass. The results are qualitatively reproduced by a theoretical model, according to which, the ABC effect is described as a result of kinematical enhancement in the independent production of the pion pairs from two parallel and independent NN → dπ reactions.

  • 5. Limbäck, Magnus
    et al.
    Dahlbäck, Mats
    Hallstadius, Lars
    Dalene, P.M.
    Devold, Harald
    Vitanza, Carlo
    Wiesenack, Wolfgang
    Jenssen, H.
    Oberländer, B.C.
    Matsson, Ingvar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Test-Reactor Study of the Phenomena Involved in Secondary Fuel Degradation2004In: Proceedings of the 2004 International Topical Meeting on LWR Fuel Performance, Orlando, Florida, September 19-22, 2004, 2004, p. 15-Chapter in book (Other academic)
  • 6.
    Lundborg, Agnes
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    BESII analysis memo: Radiative decays of ψ´ into pseudoscalars ψ´→ γK+K–, ψ´→ γπ+π–In: BESII analysis memoArticle in journal (Refereed)
  • 7.
    Lundborg, Agnes
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Exotic charmonium hybrids at PANDA2003In: Hadron Spectroscopy - Tenth International Conference on Hadron Spectroscopy: AIP Conference Proceedings, 2003, p. 431-435Chapter in book (Other academic)
  • 8.
    Lundborg, Agnes
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Simulation of ηc → γγ at PANDAManuscript (Other academic)
  • 9.
    Lundborg, Agnes
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    The Charm of Excited Glue: Charmonium in e+e and ppbar collisions2007Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis treats the mass range of charmonium states and excited gluonic fields in two experiments, BESII and PANDA, and outlines a phenomenological model that connects them.

    In BESII, e+e form a charmonium initial state, which is utilised as a source for secondary particles. The analysed channels, ψ´→ γK+K and ψ´→ γπ+π, give access to intermediate scalar states such as the two glueball candidates: f0(1500) and f0(1710). The f0(1710) is indeed observed in decay into both π+π and K+K and the f0(1500) is accepted as a necessary part of the π+π signal at the moderate 5% level. In addition, we observe the two tensor states f2(1270) (in both channels) and f2´(1525) (in K+K), but the need for the f2´(1525) is not firmly established. The region around 2 GeV/c2 is fitted with an f4(2050) and an f0(2200) in π+π. This region is fairly flat in K+K with a slight peak at the f0(2200). Branching ratios for all eight channels are given. A fit to the angular distribution of ψ´→ γ f2(1270) → γ π+πgave two possible solutions for the relative importance of helicity projections zero, one and two.

    The future ppbar experiment PANDA is still in the development phase; important physics goals have been defined and we are now taking on the laborious task of constructing a detector that is able to fulfil them. A simulation investigation of a theoretically preferred JPC=1–+ charmonium hybrid (Hc) is presented: ppbarHcπ0/η, Hcχc1 (π0π0)S–wave, χc1J/ψπ0, with a final state of seven photons and a lepton pair. To detect this channel next to full coverage of CM phase space is needed and as little material as possible before the electromagnetic calorimeter.

    A second simulation study of ppbar → ηcγγ at PANDA, suggests that the channel should be possible to detect with a signal-to-background ratio of 5±1 and a detection efficiency of at least 10%.

    By assuming a constant matrix element we obtain a relation between the decay width for ψppbar+m, which has been measured at BES for several cases, and the cross section for ppbar charmonium production in association with the same light meson, m (at for example PANDA). Cross sections of ~300–3000 pb were predicted for J/ψ production and ~30 pb for ψ' production. Isoscalars seem to be preferred to isovectors in J/ψ production, this might however be an artefact of simplifications within the model. A comparison with the only measured cross section, ppbar → J/ψπ0, suggests that the model is useful as a first estimate.

    List of papers
    1. BESII analysis memo: Radiative decays of ψ´ into pseudoscalars ψ´→ γK+K–, ψ´→ γπ+π–
    Open this publication in new window or tab >>BESII analysis memo: Radiative decays of ψ´ into pseudoscalars ψ´→ γK+K–, ψ´→ γπ+π–
    In: BESII analysis memoArticle in journal (Refereed) In press
    Identifiers
    urn:nbn:se:uu:diva-95415 (URN)
    Available from: 2007-02-02 Created: 2007-02-02 Last updated: 2010-01-14Bibliographically approved
    2. Charmonium production in ppbar: Estimating cross sections from decay widths
    Open this publication in new window or tab >>Charmonium production in ppbar: Estimating cross sections from decay widths
    2006 In: Phys. Rev., Vol. D73, p. 096003-096008Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-95416 (URN)
    Available from: 2007-02-02 Created: 2007-02-02Bibliographically approved
    3. The Charm of Hybrids
    Open this publication in new window or tab >>The Charm of Hybrids
    2003 In: Universitá degli studi di Milano, Proceedings of the XLI International Winter meeting on nuclear physics, Vol. Supplemento N120, p. 72-81Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-95417 (URN)
    Available from: 2007-02-02 Created: 2007-02-02Bibliographically approved
    4. Exotic charmonium hybrids at PANDA
    Open this publication in new window or tab >>Exotic charmonium hybrids at PANDA
    2003 In: Hadron Spectroscopy - Tenth International Conference on Hadron Spectroscopy: AIP Conference Proceedings, 2003, p. 431-435Chapter in book (Other academic) Published
    Identifiers
    urn:nbn:se:uu:diva-95418 (URN)
    Available from: 2007-02-02 Created: 2007-02-02Bibliographically approved
    5. Simulation of ηc → γγ at PANDA
    Open this publication in new window or tab >>Simulation of ηc → γγ at PANDA
    Manuscript (Other academic)
    Identifiers
    urn:nbn:se:uu:diva-95419 (URN)
    Available from: 2007-02-02 Created: 2007-02-02 Last updated: 2010-01-13Bibliographically approved
  • 10.
    Lundborg, Agnes
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    The Charm of Hybrids2003In: Universitá degli studi di Milano, Proceedings of the XLI International Winter meeting on nuclear physics, Vol. Supplemento N120, p. 72-81Article in journal (Refereed)
  • 11.
    Lundborg, Agnes
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Barnes, Ted
    Wiedner, Ulrich
    Charmonium production in ppbar: Estimating cross sections from decay widths2006In: Phys. Rev., Vol. D73, p. 096003-096008Article in journal (Refereed)
  • 12.
    Matsson, Ingvar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Studies of Nuclear Fuel Performance Using On-site Gamma-ray Spectroscopy and In-pile Measurements2006Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Presently there is a clear trend of increasing demands on in-pile performance of nuclear fuel. Higher target burnups, part length rods and various fuel additives are some examples of this trend. Together with an increasing demand from the public for even safer nuclear power utilisation, this implies an increased focus on various experimental, preferably non-destructive, methods to characterise the fuel.

    This thesis focuses on the development and experimental evaluation of such methods. In its first part, the thesis presents a method based on gamma-ray spectroscopy with germanium detectors that have been used at various power reactors in Europe. The aim with these measurements is to provide information about the thermal power distribution within fuel assemblies in order to validate core physics production codes. The early closure of the Barsebäck 1 BWR offered a unique opportunity to perform such validations before complete depletion of burnable absorbers in Gd-rods had taken place. To facilitate the measurements, a completely submersible measuring system, LOKET, was developed allowing for convenient in-pool measurements to be performed.

    In its second part, the thesis describes methods that utilise in-pile measurements. These methods have been used in the Halden test-reactor for determination of fission gas release, pellet-cladding interaction studies and fuel development studies.

    Apart from the power measurements, the LOKET device has been used for fission gas release (FGR) measurements on single fuel rods. The significant reduction in fission gas release in the modern fuel designs, in comparison with older designs, has been demonstrated in a series of experiments. A FGR database covering a wide range of burnup, power histories and fuel designs has been compiled and used for fuel performance analysis. The fission gas release has been measured on fuel rods with average burnups well above 60 MWd/kgU. The comparison between core physics calculations (PHOENIX-4/POLCA-7) and the in-pool measurements of thermal power indicates that the nodal power can generally be predicted with an accuracy within 4% and the bundle power with an accuracy better than 2%, expressed as rms errors.

    In-pile experiments have successfully simulated the conditions that occur in a fuel rod following a primary debris failure, being secondary fuel degradation. It was concluded that massive hydrogen pick-up takes place during the first few days following the primary failure and that a pre-oxidized layer does not function as a barrier towards hydriding in an environment with a very high partial pressure of hydrogen. Another series of in-pile experiments clearly indicate that increased UO2 grain size is an effective way of suppressing fission gas release in LWR fuel up to the burnup level covered (55 MWd/kgUO2).

    List of papers
    1. Developments in Gamma Scanning of Irradiated Nuclear Fuel
    Open this publication in new window or tab >>Developments in Gamma Scanning of Irradiated Nuclear Fuel
    1997 In: Applied Radiation and Isotopes, ISSN 0969-8043, Vol. 48, no 10-12, p. 1289-1298Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-94559 (URN)
    Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
    2. Fission Gas Release Determination Using an Anti-Compton Shield Detector
    Open this publication in new window or tab >>Fission Gas Release Determination Using an Anti-Compton Shield Detector
    Show others...
    1998 In: Nuclear Technology, ISSN 0029-5450, Vol. 122, no 3, p. 276-283Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-94560 (URN)
    Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
    3. Fission Gas Release in ABB SVEA 10x10 BWR Fuel
    Open this publication in new window or tab >>Fission Gas Release in ABB SVEA 10x10 BWR Fuel
    1997 In: Proceedings from the International Topical Meeting on LWR Fuel Performance, Portland, Oregon, USA, march 2-5, 1997, 1997, p. 8-Chapter in book (Other academic) Published
    Identifiers
    urn:nbn:se:uu:diva-94561 (URN)
    Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
    4. Fission Gas Release in ABB SVEA-96/100 Fuel
    Open this publication in new window or tab >>Fission Gas Release in ABB SVEA-96/100 Fuel
    1997 In: Proceedings from the TopFuel '97 Conference, Manchester, UK, June 9-11, 1997, 1997, p. 9-Chapter in book (Other academic) Published
    Identifiers
    urn:nbn:se:uu:diva-94562 (URN)0 7277 2619 6 (ISBN)
    Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
    5. The shut-down of the Barseback 1 BWR: A unique opportunity to measure the power distribution in nuclear fuel rods
    Open this publication in new window or tab >>The shut-down of the Barseback 1 BWR: A unique opportunity to measure the power distribution in nuclear fuel rods
    2006 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 33, no 13, p. 1091-1101Article in journal (Refereed) Published
    Abstract [en]

    Reactor poolside measurements of gamma radiation specific for the fission product La-140 (1596 keV) have been used for an experimental determination of axial power distributions in 55 nuclear fuel rods irradiated in the Barseback 1 BWR nuclear power plant. The measurements take advantage of the unique situation of a very short last reactor cycle of only three months due to the out-phasing of the reactor unit at November 30 1999. La-140 whose decay is controlled by the mother nuclide Ba-140 with the half-life 12.75 days reflects an average power distribution, representative for the latest weeks of core operation (in this case basically during November 1999). The measured intensities have been transformed into a 25 nodal representation to allow a precise and direct comparison with the corresponding calculated power distribution. The 55 rods were selected from two different fuel assemblies with average burn-ups of 1.9 and 9.7 MWd/ kgU, respectively (that is one fresh bundle and one slightly more than one cycle bundle). The stability and the linearity of the measurement system were evaluated. The linearity was checked using the two-source method. The stability was checked by recurrent measurements on a reference fuel rod. The results have been used in the validation of the pin power reconstruction model of Westinghouse 3D core simulator POLCA-7. The deviation between measured and calculated Ba-140 concentration (expressed as radial error) is typically a few percent on rod level. Results indicate that also Gd-rods are properly modelled over a broad range of conditions. It is indicated that predictions for fuel rods in their first month of operation are less accurate than for the rest of the rods.

    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-94563 (URN)10.1016/j.anucene.2006.07.007 (DOI)000242114100003 ()
    Available from: 2006-05-16 Created: 2006-05-16 Last updated: 2017-12-14Bibliographically approved
    6. On-site Gamma-ray Spectroscopic Measurements of Fission Gas Release in Irradiated Nuclear Fuel
    Open this publication in new window or tab >>On-site Gamma-ray Spectroscopic Measurements of Fission Gas Release in Irradiated Nuclear Fuel
    2007 (English)In: Applied Radiation and Isotopes, ISSN 0969-8043, E-ISSN 1872-9800, Vol. 65, no 1, p. 36-45Article in journal (Refereed) Published
    Abstract [en]

    An experimental, non-destructive in-pool, method for measuring fission gas release (FGR) in irradiated nuclear fuel has been developed. Using the method, a significant number of experiments have been performed in-pool at several nuclear power plants of the BWR type. The method utilises the 514 keV gamma-radiation from the gaseous fission product Kr-85 captured in the fuel rod plenum volume. A submergible measuring device (LOKET) consisting of an HPGe-detector and a collimator system was utilised allowing for single rod measurements on virtually all types of BWR fuel. A FGR database covering a wide range of burn-ups (up to average rod burn-up well above 60 MWd/kgU), irradiation history, fuel rod position in cross section and fuel designs has been compiled and used for computer code benchmarking, fuel performance analysis and feedback to reactor operators. Measurements clearly indicate the low FGR in more modern fuel designs in comparison to older fuel types.

    Keywords
    FGR database, fission gas release (FGR), fuel performance, fuel design, gamma-ray spectroscopy, krypton, LOKET
    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-94564 (URN)10.1016/j.apradiso.2006.07.004 (DOI)000242678800007 ()
    Available from: 2006-05-16 Created: 2006-05-16 Last updated: 2017-12-14Bibliographically approved
    7. LOKET- a Gamma-ray Spectroscopy System for In-pool Measurements of Thermal Power Distribution in Nuclear Fuel
    Open this publication in new window or tab >>LOKET- a Gamma-ray Spectroscopy System for In-pool Measurements of Thermal Power Distribution in Nuclear Fuel
    In: Nucl. Instrum. Meth. AArticle in journal (Refereed) Submitted
    Identifiers
    urn:nbn:se:uu:diva-94565 (URN)
    Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
    8. The integral fuel rod behaviour test IFA-597.3: Analysis of the measurements
    Open this publication in new window or tab >>The integral fuel rod behaviour test IFA-597.3: Analysis of the measurements
    1998 In: OECD Halden Reactor Project Work Report Series, no HWR-561, p. iv+29-Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-94566 (URN)
    Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
    9. The effect of fuel micro-structure and burn-up on FGR and PCMI studied in IFA-534.13
    Open this publication in new window or tab >>The effect of fuel micro-structure and burn-up on FGR and PCMI studied in IFA-534.13
    1998 In: OECD Halden Reactor Project Work Report Series, no HWR-546, p. iv+21-Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-94567 (URN)
    Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
    10. The Effect of Grain Size on FGR and PCMI in High Burnup Fuel (IFA-534.14) (Preliminary Results)
    Open this publication in new window or tab >>The Effect of Grain Size on FGR and PCMI in High Burnup Fuel (IFA-534.14) (Preliminary Results)
    1998 In: OECD Halden Reactor Project Work Report Series, no HWR-561, p. iv+7-Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-94568 (URN)
    Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
    11. The Effect of Grain Size on FGR and PCMI in High Burnup Fuel
    Open this publication in new window or tab >>The Effect of Grain Size on FGR and PCMI in High Burnup Fuel
    1999 In: OECD Halden Reactor Project Work Report Series, no HWR-558, p. iv+19-Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-94569 (URN)
    Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
    12. Reaction Kinetics of Oxidation and Hydriding Inside Operating Fuel Rods
    Open this publication in new window or tab >>Reaction Kinetics of Oxidation and Hydriding Inside Operating Fuel Rods
    1999 In: OECD Halden Reactor Project Work Report Series, no HWR-602, p. iv+29-Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-94570 (URN)
    Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
    13. Test-Reactor Study of the Phenomena Involved in Secondary Fuel Degradation
    Open this publication in new window or tab >>Test-Reactor Study of the Phenomena Involved in Secondary Fuel Degradation
    Show others...
    2004 In: Proceedings of the 2004 International Topical Meeting on LWR Fuel Performance, Orlando, Florida, September 19-22, 2004, 2004, p. 15-Chapter in book (Other academic) Published
    Identifiers
    urn:nbn:se:uu:diva-94571 (URN)
    Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
  • 13.
    Matsson, Ingvar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    The Effect of Grain Size on FGR and PCMI in High Burnup Fuel1999In: OECD Halden Reactor Project Work Report Series, no HWR-558, p. iv+19-Article in journal (Refereed)
  • 14.
    Matsson, Ingvar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    The Effect of Grain Size on FGR and PCMI in High Burnup Fuel (IFA-534.14) (Preliminary Results)1998In: OECD Halden Reactor Project Work Report Series, no HWR-561, p. iv+7-Article in journal (Refereed)
  • 15.
    Matsson, Ingvar
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Grapengiesser, Björn
    Developments in Gamma Scanning of Irradiated Nuclear Fuel1997In: Applied Radiation and Isotopes, ISSN 0969-8043, Vol. 48, no 10-12, p. 1289-1298Article in journal (Refereed)
  • 16.
    Matsson, Ingvar
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Grapengiesser, Björn
    The shut-down of the Barseback 1 BWR: A unique opportunity to measure the power distribution in nuclear fuel rods2006In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 33, no 13, p. 1091-1101Article in journal (Refereed)
    Abstract [en]

    Reactor poolside measurements of gamma radiation specific for the fission product La-140 (1596 keV) have been used for an experimental determination of axial power distributions in 55 nuclear fuel rods irradiated in the Barseback 1 BWR nuclear power plant. The measurements take advantage of the unique situation of a very short last reactor cycle of only three months due to the out-phasing of the reactor unit at November 30 1999. La-140 whose decay is controlled by the mother nuclide Ba-140 with the half-life 12.75 days reflects an average power distribution, representative for the latest weeks of core operation (in this case basically during November 1999). The measured intensities have been transformed into a 25 nodal representation to allow a precise and direct comparison with the corresponding calculated power distribution. The 55 rods were selected from two different fuel assemblies with average burn-ups of 1.9 and 9.7 MWd/ kgU, respectively (that is one fresh bundle and one slightly more than one cycle bundle). The stability and the linearity of the measurement system were evaluated. The linearity was checked using the two-source method. The stability was checked by recurrent measurements on a reference fuel rod. The results have been used in the validation of the pin power reconstruction model of Westinghouse 3D core simulator POLCA-7. The deviation between measured and calculated Ba-140 concentration (expressed as radial error) is typically a few percent on rod level. Results indicate that also Gd-rods are properly modelled over a broad range of conditions. It is indicated that predictions for fuel rods in their first month of operation are less accurate than for the rest of the rods.

  • 17.
    Matsson, Ingvar
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Grapengiesser, Björn
    Andersson, Björn
    LOKET- a Gamma-ray Spectroscopy System for In-pool Measurements of Thermal Power Distribution in Nuclear FuelIn: Nucl. Instrum. Meth. AArticle in journal (Refereed)
  • 18.
    Matsson, Ingvar
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Grapengiesser, Björn
    Andersson, Björn
    On-site Gamma-ray Spectroscopic Measurements of Fission Gas Release in Irradiated Nuclear Fuel2007In: Applied Radiation and Isotopes, ISSN 0969-8043, E-ISSN 1872-9800, Vol. 65, no 1, p. 36-45Article in journal (Refereed)
    Abstract [en]

    An experimental, non-destructive in-pool, method for measuring fission gas release (FGR) in irradiated nuclear fuel has been developed. Using the method, a significant number of experiments have been performed in-pool at several nuclear power plants of the BWR type. The method utilises the 514 keV gamma-radiation from the gaseous fission product Kr-85 captured in the fuel rod plenum volume. A submergible measuring device (LOKET) consisting of an HPGe-detector and a collimator system was utilised allowing for single rod measurements on virtually all types of BWR fuel. A FGR database covering a wide range of burn-ups (up to average rod burn-up well above 60 MWd/kgU), irradiation history, fuel rod position in cross section and fuel designs has been compiled and used for computer code benchmarking, fuel performance analysis and feedback to reactor operators. Measurements clearly indicate the low FGR in more modern fuel designs in comparison to older fuel types.

  • 19.
    Matsson, Ingvar
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Jansson, Peter
    Grapengiesser, Björn
    Håkansson, Ane
    Bäcklin, Anders
    Fission Gas Release Determination Using an Anti-Compton Shield Detector1998In: Nuclear Technology, ISSN 0029-5450, Vol. 122, no 3, p. 276-283Article in journal (Refereed)
  • 20.
    Matsson, Ingvar
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Teshima, Hideyuki
    The effect of fuel micro-structure and burn-up on FGR and PCMI studied in IFA-534.131998In: OECD Halden Reactor Project Work Report Series, no HWR-546, p. iv+21-Article in journal (Refereed)
  • 21.
    Matsson, Ingvar
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Turnbull, James
    The integral fuel rod behaviour test IFA-597.3: Analysis of the measurements1998In: OECD Halden Reactor Project Work Report Series, no HWR-561, p. iv+29-Article in journal (Refereed)
  • 22. Schrire, David
    et al.
    Matsson, Ingvar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Grapengiesser, Björn
    Fission Gas Release in ABB SVEA 10x10 BWR Fuel1997In: Proceedings from the International Topical Meeting on LWR Fuel Performance, Portland, Oregon, USA, march 2-5, 1997, 1997, p. 8-Chapter in book (Other academic)
  • 23.
    Stenmark, Mårten
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    Shout at the eta2004Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Quantum chromodynamics has interesting limits both in the low and the high-energy region. In the low energy region one has phenomenology of meson interactions which are still not clearly understood. In the high-energy region one wants to find a new theory which will envelope gravity and the standard model in the quantum framework, possibly via some kind of string theory.

    In this thesis some aspects are touched upon including both these limits. On the one hand we look at meson scattering close to threshold and try to describe cross sections via phenomenological models such as the two-step model. We then go on and dwell upon noncommutative geometry, a framework which has been successful in describing certain aspects of the theory of strings.

    The low-energy calculations gave some insight into the need for finding better understanding of the theories of mesons. The work on noncommutative geometry was on the other hand fruitful in gaining understanding of certain connections between different star products and their relations on a local level.

    List of papers
    1. The pd → 3He η reaction near threshold
    Open this publication in new window or tab >>The pd → 3He η reaction near threshold
    2003 In: Phys. Rev. C, Vol. 67, p. 6-Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-92413 (URN)
    Available from: 2004-11-22 Created: 2004-11-22Bibliographically approved
    2. The NN → NN η reaction revisited
    Open this publication in new window or tab >>The NN → NN η reaction revisited
    Article in journal (Refereed) Submitted
    Identifiers
    urn:nbn:se:uu:diva-92414 (URN)
    Available from: 2004-11-22 Created: 2004-11-22Bibliographically approved
    3. The production of theta baryons in proton-deuteron collisions near threshold
    Open this publication in new window or tab >>The production of theta baryons in proton-deuteron collisions near threshold
    Article in journal (Refereed) Submitted
    Identifiers
    urn:nbn:se:uu:diva-92415 (URN)
    Available from: 2004-11-22 Created: 2004-11-22Bibliographically approved
    4. Invariant Star Products on S 2 and the Canonical Trace
    Open this publication in new window or tab >>Invariant Star Products on S 2 and the Canonical Trace
    2004 (English)In: Letters in Mathematical Physics, ISSN 0377-9017, E-ISSN 1573-0530, Vol. 70, no 2, p. 109-120Article in journal (Refereed) Published
    Abstract [en]

    We calculate the canonical trace and use the Fedosov–Nest–Tsygan index theorem to obtain the characteristic class for a star product on S 2. We show how, for this simple example, it is possible to extract the relevant information needed to use the Fedosov–Nest–Tsygan index theorem from a local calculation.

    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:uu:diva-92416 (URN)10.1007/s11005-004-4290-7 (DOI)
    Available from: 2004-11-22 Created: 2004-11-22 Last updated: 2017-12-14Bibliographically approved
  • 24.
    Stenmark, Mårten
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    The NN → NN η reaction revisitedArticle in journal (Refereed)
  • 25.
    Stenmark, Mårten
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
    The pd → 3He η reaction near threshold2003In: Phys. Rev. C, Vol. 67, p. 6-Article in journal (Refereed)
1 - 25 of 25
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