Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 55: Hadronenstruktur und -spektroskopie
HK 55.2: Vortrag
Freitag, 23. März 2012, 11:30–11:45, RW 2
Double-Pionic Fusion to 3He – ABC-Effect and Resonance Structure* — •Elena Perez del Rio — Physikalisches Institut, Univ. Tübingen
The double-pionic fusion to 3He was historically the reaction, where the ABC effect (low-mass enhancement of the ππ-invariant mass spectrum) was observed in inclusive measurements more than 50 years ago for the first time. Meanwhile we know from exclusive and kinematically complete high-statistics maesurements with WASA at COSY that there is 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 → d π0π0 reaction [1].
In order to investigate the situation in the double-pionic fusion to 3He we have measured the energy dependence of the ABC effect in the fusion to 3He by fixed energy measurements of the type pd → 3Heππ and by quasifree and coherent measurements of the type dd → 3Heππ n.
The experimental results for the different reaction scenarios will be discussed.
[1] P. Adlarson et al., Phys. Rev. Lett. 106, 242302 (2011)
* supported by BMBF and COSY-FFE (FZ Jülich)