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Single-pion production in pp collisions at 0.95 GeV/c (I)
Authors:S Abd El-Samad  R Bilger  K -Th Brinkmann  H Clement  M Dietrich  E Doroshkevich  S Dshemuchadse  A Erhardt  W Eyrich  A Filippi  H Freiesleben  M Fritsch  R Geyer  A Gillitzer  J Hauffe  D Hesselbarth  R Jaekel  B Jakob  L Karsch  K Kilian  H Koch  J Kress  E Kuhlmann  S Marcello  S Marwinski  R Meier  K Möller  H P Morsch  L Naumann  E Roderburg  P Schönmeier  M Schulte-Wissermann  W Schroeder  M Steinke  F Stinzing  G Y Sun  J Wächter  G J Wagner  M Wagner  U Weidlich  A Wilms  S Wirth  G Zhang  P Zupranski
Institution:8. Atomic Energy Authority NRC, Cairo, Egypt
6. Physikalisches Institut der Universit?t Tübingen, Auf der Morgenstelle 14, D-72076, Tübingen, Germany
2. Technische Universit?t Dresden, Germany
5. Forschungszentrum Rossendorf, Germany
3. Friedrich-Alexander-Universit?t Erlangen-Nürnberg, Germany
7. Sezione di Torino, University of Torino and INFN, Italy
1. Ruhr-Universit?t Bochum, Germany
4. Forschungszentrum Jülich, Germany
9. Soltan Institute for Nuclear Studies, Warsaw, Poland
Abstract:The single-pion production reactions ppdπ+, ppnpπ+ and ppppπ0 were measured at a beam momentum of 0.95GeV/c ( T p ≈ 400MeV) using the short version of the COSY-TOF spectrometer. The implementation of a central calorimeter provided particle identification, energy determination and neutron detection in addition to time-of-flight and angle measurements. Thus, all pion production channels were recorded with 1-4 overconstraints. The total and differential cross-sections obtained are compared to previous data and theoretical calculations. Main emphasis is put on the discussion of the ppπ0 channel, where we obtain angular distributions different from previous experimental results, however, partly in good agreement with recent phenomenological and theoretical predictions. In particular, we observe very large anisotropies for the π0 angular distributions in the kinematical region of small relative proton momenta revealing there a dominance of proton spinflip transitions associated with π0 s and d partial waves and emphasizing the important role of π0 d-waves.
Keywords:13  75  Cs Nucleon-nucleon interactions (including antinucleons  deuterons  etc  )  25  10  +s Nuclear reactions involving few-nucleon systems  25  40  Ep Inelastic proton scattering  29  20  Dh Storage rings
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