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Double Pion Production in the dd to αππ reaction
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
2008 (English)Doctoral 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.

Place, publisher, year, edition, pages
Uppsala: Avdelningen för kärnfysik , 2008. , 107 p.
Series
Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-2516 ; 77
Keyword [en]
Nuclear physics, ABC effect, double pion
Keyword [sv]
Kärnfysik
Research subject
Nuclear Physics
Identifiers
URN: urn:nbn:se:uu:diva-8926ISBN: 978-91-554-7231-3 (print)OAI: oai:DiVA.org:uu-8926DiVA: diva2:172240
Public defence
2008-06-13, Polhemsalen, Ångström lab., Lägerhyddsv. 1, Uppsala, 10:00
Opponent
Supervisors
Available from: 2008-05-15 Created: 2008-05-15Bibliographically approved

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