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- Title
THE pp → dπ<sup>+</sup>π<sup>0</sup> REACTION — A CASE OF ΔΔ EXCITATION WITHOUT ABC-EFFECT.
- Authors
KREN, F.; BASHKANOV, M.; BOGOSLOWSKY, D.; CALÉN, H.; CLEMENT, H.; EKSTRÖM, C.; FRANSSON, K.; GUSTAFSSON, L.; HÖISTAD, B.; IVANOV, G.; JACEWICZ, M.; JIGANOV, E.; JOHANSSON, T.; KELETA, S.; KHAKIMOVA, O.; KOCH, I.; KULLANDER, S.; KUPŚĆ, A.; KUZNETSOV, A.; MARCINIEWSKI, P.
- Abstract
The ABC effect, a low-mass enhancement in the invariant ππ mass, is observed in double-pionic fusion reactions leading to a bound nuclear system in the final state. From previous measurements there have been indications that this phenomenon is resctricted to the σ channel of the ππ system. With exclusive measurements of the pp → dπ+π0 reaction at Tp = 1.1 GeV we demonstrate that, indeed, the ABC effect does not occur in the vector-isovector ππ channel (ρ channel) despite the fact that the ΔΔ excitation is oberved to be the dominant reaction process. We also show that this reaction is well described by a t-channel ΔΔ excitation with the subsequent decay into the vector-isovector ππ channel given by the ρ channel operator.
- Subjects
NUCLEAR excitation; NUCLEAR fusion; RADIOACTIVE decay; CONTROLLED fusion; NUCLEAR reactions; NUCLEAR physics
- Publication
International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics, 2009, Vol 24, Issue 2/3, p561
- ISSN
0217-751X
- Publication type
Article