TY  - JOUR
AU  - Abdel-Samad, S.
AU  - Bilger, R.
AU  - Brinkmann, K.
AU  - et, al
TI  - Single-pion production in pp collisions at 0.95 GeV/c (II)
JO  - The European physical journal / A
VL  - 39
SN  - 1434-6001
CY  - Berlin
PB  - Springer
M1  - PreJuSER-8500
SP  - 281 - 289
PY  - 2009
N1  - This work has been supported by BMBF, DFG (Europ. Graduiertenkolleg 683) and COSY-FFE. We acknowledge valuable discussions with R. A. Arndt, L. Alvarez-Ruso, D. Bugg, C. Hanhart, M. Kaskulov, V. Kukulin, E. Oset, I. Strakovsky, W. Weise and C. Wilkin.
AB  - 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.
KW  - p p: exclusive reaction (INSPIRE)
KW  - pi+: hadroproduction (INSPIRE)
KW  - pi0: hadroproduction (INSPIRE)
KW  - cross section: energy dependence (INSPIRE)
KW  - p: angular distribution (INSPIRE)
KW  - Delta(1232) (INSPIRE)
KW  - impulse approximation: plane wave (INSPIRE)
KW  - spectrometer: time-of-flight (INSPIRE)
KW  - experimental results (INSPIRE)
KW  - Juelich COSY PS (INSPIRE)
KW  - p p --> 2 nucleon pi (INSPIRE)
KW  - p p --> deuteron pi+ (INSPIRE)
KW  - 0.95 GeV/c (INSPIRE)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000264537600003
DO  - DOI:10.1140/epja/i2008-10721-4
UR  - https://juser.fz-juelich.de/record/8500
ER  -