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HK: Fachverband Physik der Hadronen und Kerne
HK 35: Elektromagnetische und Hadronische Sonden
HK 35.1: Vortrag
Mittwoch, 14. März 2007, 17:00–17:15, A
Single-Pion Production at Tp = 400 MeV and the Excitation of the Δ Resonance* — •Evgueni Doroshkevich, Heinz Clement, Katharina Ehrhardt, Arthur Erhardt, and Gerhard Wagner for the COSY-TOF collaboration — Physikalisches Institut der Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen
The single-pion production in nucleon-nucleon collisions has been measured at COSY-TOF at Tp=400 MeV over the complete phase space region. In pp→ ppπ0 the Δ excitation is heavily suppressed near threshold - though an intermediate pΔ+ configuration with the two constituents being in relative p-wave can be sensed in the angular distributions [1].
The pp→ npπ+ reaction on the other hand appears to be strongly dominated by the Δ excitation process with nΔ++ and pΔ+ configurations in the intermediate state, as can be observed in the Dalitzplot together with its invariant mass projections as well as in the angular distributions.
[1] S. Abd El-Samad et al, EPJ A30 (2006) 443
*supported by BMBF (06 TU 261), DFG (Europ. Grad. School), COSY-FFE