Single-Pion Production in pp Collisions at 0.95 GeV/c (II)

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dc.creatorEl-Samad, S. Abd
dc.creatorBilger, R.
dc.creatorBrinkmann, K. Th.
dc.creatorClement, H.
dc.creatorDietrich, M.
dc.creatorDoroshkevich, E.
dc.creatorDshemuchadse, S.
dc.creatorEhrhardt, K.
dc.creatorErhardt, A.
dc.creatorEyrich, W.
dc.creatorFilippi, A.
dc.creatorFreiesleben, H.
dc.creatorFritsch, M.
dc.creatorGeyer, R.
dc.creatorGillitzer, A.
dc.creatorHauffe, J.
dc.creatorHesselbarth, D.
dc.creatorJaekel, R.
dc.creatorJakob, B.
dc.creatorKarsch, L.
dc.creatorKilian, K.
dc.creatorKress, J.
dc.creatorKuhlmann, E.
dc.creatorMarcello, S.
dc.creatorMarwinski, S.
dc.creatorMeier, R.
dc.creatorMoeller, K.
dc.creatorMorsch, H. P.
dc.creatorNaumann, L.
dc.creatorRitman, J.
dc.creatorRoderburg, E.
dc.creatorSchoenmeier, P.
dc.creatorSchulte-Wissermann, M.
dc.creatorSchroeder, W.
dc.creatorStinzing, F.
dc.creatorSun, G. Y.
dc.creatorWaechter, J.
dc.creatorWagner, G. J.
dc.creatorWagner, M.
dc.creatorWeidlich, U.
dc.creatorWilms, A.
dc.creatorWirth, S.
dc.creatorZhang, G.
dc.creatorZupranski, P.
dc.date2008-07-08
dc.date2009-01-15
dc.date.accessioned2026-07-07T13:04:37Z
dc.date.available2026-07-07T13:04:37Z
dc.descriptionThe single-pion production reactions $pp\to dπ^+$, $pp\to npπ^+$ and $pp\to ppπ^0$ were measured at a beam momentum of 0.95 GeV/c ($T_p \approx$ 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. Main emphasis is put on the presentation and discussion of the $npπ^+$ 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 $ppπ^0$ channel we find in the $npπ^+$ channel a strong influence of the $Δ$ excitation already at this energy close to threshold. In particular we find a $(3 cos^2Θ+ 1)$ dependence in the pion angular distribution, typical for a pure s-channel $Δ$ excitation and identical to that observed in the $dπ^+$ channel. Since the latter is understood by a s-channel resonance in the $^1D_2$ $pn$ partial wave, we discuss an analogous scenario for the $pnπ^+$ channel.
dc.identifierhttps://arxiv.org/abs/0807.1189
dc.identifierhttp://arxiv.org/abs/0807.1189
dc.identifierEur.Phys.J.A39:281-289,2009
dc.identifierdoi:10.1140/epja/i2008-10721-4
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/227226
dc.subjectNuclear Experiment
dc.titleSingle-Pion Production in pp Collisions at 0.95 GeV/c (II)
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