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| Hauptseite > Publikationsdatenbank > Single-pion production in pp collisions at 0.95 GeV/c (II) |
| Hauptseite > Publikationsdatenbank > Single-pion production in pp collisions at 0.95 GeV/c (II) |
| Journal Article | PreJuSER-8500 |
; ; ;
2009
Springer
Berlin
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Please use a persistent id in citations: http://hdl.handle.net/2128/10455 doi:10.1140/epja/i2008-10721-4
Abstract: 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.
Keyword(s): p p: exclusive reaction ; pi+: hadroproduction ; pi0: hadroproduction ; cross section: energy dependence ; p: angular distribution ; Delta(1232) ; impulse approximation: plane wave ; spectrometer: time-of-flight ; experimental results ; Juelich COSY PS ; p p --> 2 nucleon pi ; p p --> deuteron pi+ ; 0.95 GeV/c
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