( , t)2p reaction at 2 GeVB. Ramstein1, C. Mosbacher2, T. Hennino1, W. Augustyniak3, D. Bachelier1, H.G. Bohlen4, J.L. Boyard1, R. Dahl5, C. Ellegaard5, C. Gaarde5, J. Gosset6, J.C. Jourdain1, J.S. Larsen5, M.C. Lemaire6, D. L'Hôte6, H.P. Morsch4, M. Österlund7, J. Poitou6, P. Radvanyi4, M. Roy-Stephan1, T. Sams4, 5, M. Skousen5, S. Tarlé-Rousteau1 and P. Zupranski1, 4, 3
1 Institut de Physique Nucléaire, IN2P3(CNRS), 91406 Orsay Cedex, France
2 Institut für Kernphysik, Forschungszentrum Jülich GmbH, D-52425, Germany
3 Soltan Institute for Nuclear Studies, 00681 Warsaw, Poland
4 Laboratoire National Saturne, IN2P3(CNRS) and DSM(CEA), F-91191 Gif-sur-Yvette Cedex, France
5 Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
6 DSM/Dapnia, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France
7 Institute of Physics, University of Lund, S-223 62 Lund, Sweden
(Received: 21 October 2002 / Published online: 11 March 2003)
The exclusive ( , t)2p reaction has been studied at 2 GeV for energy transfers up to 500 MeV and triton angles up to 3.4°. The protons were measured in the large acceptance magnetic detector DIOGENE, in coincidence with the forward tritons detected in a dedicated magnetic arm. The energy transfer spectra extend well above the pion threshold. However, in the region of excitation, the yield is less than 10% of the inclusive ( , t) cross-section, which indicates the small contribution of the N NN process. The angular distributions of the two protons in their center of mass have been analysed as a function of energy transfer and triton angle and a Legendre polynomial decomposition has been achieved. These data have been compared to a model based on a coupled-channel approach for describing the NN and N systems.
25.55.Kr - Charge-exchange reactions.
14.20.Gk - Baryon resonances with S=0 .
24.10.Eq - Coupled-channel and distorted-wave models.
© Società Italiana di Fisica, Springer-Verlag 2003