Issue |
EPJ Web of Conferences
Volume 37, 2012
MESON 2012 – 12th International Workshop on Production, Properties and Interaction of MESONS
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|
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Article Number | 09029 | |
Number of page(s) | 3 | |
Section | Posters | |
DOI | https://doi.org/10.1051/epjconf/20123709029 | |
Published online | 06 December 2012 |
https://doi.org/10.1051/epjconf/20123709029
ABC Effect and Resonance Structure in the Double-Pionic Fusion to 3He
1 Physikalisches Institut, Univ. Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
2 Kepler Center for Astro and Particle Physics, Univ. Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen
a e-mail: clement@pit.physik.uni-tuebingen.de
Historically the double-pionic fusion to 3He is the reaction, where the ABC effect (low-mass enhancement of the ππ-invariant mass spectrum) was observed for the first time more than 50 years ago. Meanwhile exclusive and kinematically complete high-statistics measurements with WASA at COSY revealed a strict correlation between the ABC effect and a narrow resonance structure with I(JP) = 0(3+) in the total cross section of the most basic double-pionic fusion, the pn → dπ0π0 reaction. In order to investigate the situation in the double-pionic fusion to 3He the energy dependence of the ABC effect in the fusion to 3He has been measured by fixed energy measurements of the type pd →3Heππ as well as by quasifree and coherent measurements of the type dd →3He n ππ.
© Owned by the authors, published by EDP Sciences, 2012
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