2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 16, 583-597 (2003)
DOI: 10.1140/epja/i2002-10116-7

$\chem{^{2}H}$( $\chem{^{3}He}$, t)2p reaction at 2 GeV

B. 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

ramstein@ipno.in2p3.fr

(Received: 21 October 2002 / Published online: 11 March 2003)

Abstract
The exclusive $\chem{^{2}H}$( $\chem{^{3}He}$, 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 $\Delta$ excitation, the yield is less than 10% of the inclusive $\chem{^{2}H}$( $\chem{^{3}He}$, t) cross-section, which indicates the small contribution of the $\Delta$N $\to$ 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 $\Delta$ systems.

PACS
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