Eur. Phys. J. A 16, 127-137 (2003)
DOI: 10.1140/epja/i2002-10079-7

Measurement of the production in proton-proton collisions with the COSY time-of-flight spectrometer

M. Abdel-Bary¹, S. Abdel-Samad¹, R. Bilger², K.-Th. Brinkmann³, H. Clement², S. Dshemuchadse⁴, E. Dorochkevitch², H. Dutz⁵, W. Eyrich⁶, A. Erhardt², D. Filges¹, A. Filippi⁷, H. Freiesleben³, M. Fritsch⁶, R. Geyer¹, A. Gillitzer¹, D. Hesselbarth¹, B. Jakob³, L. Karsch³, K. Kilian¹, H. Koch⁸, J. Kreß², E. Kuhlmann³, S. Marcello⁷, S. Marwinski¹, S. Mauro⁸, W. Meyer⁸, P. Michel⁴, K. Möller⁴, H. P. Morsch¹, L. Naumann⁴, N. Paul¹, M. Richter³, E. Roderburg¹, M. Rogge¹, A. Schamlott⁴, M. Schmitz¹, P. Schönmeier³, M. Schulte-Wissermann³, W. Schroeder⁶, T. Sefzick¹, F. Stinzing⁶, G.Y. Sun³, G.J. Wagner², M. Wagner⁶, A. Wilms⁸, P. Wintz¹, S. Wirth⁶ and P. Zupranski<sup>9

1</sup>  Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
²  Physikalisches Institut, Universität Tübingen, D-72076 Tübingen, Germany
³  Institut für Kern- und Teilchenphysik, Technische Universität Dresden, D-01062 Dresden, Germany
⁴  Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, D-01314 Dresden, Germany
⁵  Physikalisches Institut, Universität Bonn, D-53115 Bonn, Germany
⁶  Physikalisches Institut, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
⁷  INFN Torino, I-10125 Torino, Italy
⁸  Institut für Experimentalphysik, Universität Bochum, D-44780 Bochum, Germany
⁹  Andrzej Soltan Institute for Nuclear Studies, PL-00681 Warsaw, Poland

e.roderburg@fz-juelich.de

(Received: 24 May 2002 / Revised version: 20 September 2002 / Published online: 17 January 2003)

Abstract
The reaction was measured at excess energies of 15 and 41 MeV at an external target of the Jülich Cooler Synchrotron COSY with the time-of-flight spectrometer. About 25000 events were measured for the excess energy of 15 MeV and about 8000 for 41 MeV. Both protons of the process were detected with an acceptance of nearly 100% and the was reconstructed by the missing-mass technique. For both excess energies the angular distributions are found to be nearly isotropic. In the invariant-mass distributions strong deviations from the pure phase space distributions are seen.

PACS
25.40.Ve - Other reactions above meson production thresholds (energies 400 MeV).
13.75.Cs - Nucleon-nucleon interactions (including antinucleons, deuterons, etc.).
14.40.Aq - , K, and mesons.

© Società Italiana di Fisica, Springer-Verlag 2003