Anmerkungen:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Beschreibung:
The single-pion production reactions pp -> d pi(+), pp -> np pi(+) and pp -> pp pi(0) were measured at a beam momentum of 0.95 GeV/c (T-p approximate to 400 MeV) using the short version of the COSY-TOF spectrometer. The central calorimeter provided particle identification, energy determination and neutron detection in addition to time-of-flight and angle measurements from other detector parts. Thus all pion production channels were recorded with 1-4 overconstraints. The main emphasis is put on the presentation and discussion of the npp+ channel, since the results on the other channels have already been published previously. The total and differential cross-sections obtained are compared to theoretical calculations. In contrast to the pp pi(0) channel we observe in the np pi(+) channel a strong influence of the Delta excitation. In particular, the pion angular distribution exhibits a (3cos(2) circle minus + 1)-dependence, typical for a pure s-channel Delta excitation and identical to that observed in the dp+ channel. Since the latter is understood by a s-channel resonance in the D-1(2) pn partial wave, we discuss an analogous scenario for the pn pi(+) channel.