Eur. Phys. J. A (2010) 45: 11-21
https://doi.org/10.1140/epja/i2010-10981-3

Regular Article - Experimental Physics

Production of and 3 mesons in the pd ³HeX reaction at 1360 and 1450 MeV

¹ Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20, Uppsala, Sweden
² Department of Physics, Stockholm University, S-106 91, Stockholm, Sweden
³ Physikalisches Institut der Universität Tübingen, D-72076, Tübingen, Germany
⁴ Sołtan Institute of Nuclear Studies, PL-00-681, Warsaw, Poland
⁵ Joint Institute for Nuclear Research, 141980, Dubna, Moscow region, Russia
⁶ Institut für Experimentalphysik, Universität Hamburg, D-22761, Hamburg, Germany
⁷ The Svedberg Laboratory, S-751 21, Uppsala, Sweden
⁸ Budker Institute of Nuclear Physics, 630 090, Novosibirsk, Russia
⁹ Institut für Kernphysik, Forschungszentrum Jülich GmbH, D-52425, Jülich, Germany
¹⁰ Moscow Engineering Physics Institute, Moscow, Russia
¹¹ Institute of Theoretical and Experimental Physics, Moscow, Russia
¹² Institute of Experimental Physics, University of Warsaw, PL-00-681, Warsaw, Poland
¹³ Soltan Institute of Nuclear Studies, PL-90-950, Lodz, Poland

Received: 12 January 2010
Revised: 22 March 2010
Accepted: 30 April 2010
Published online: 12 June 2010

Abstract

The cross-sections of the pd ³He , pd ³He and pd ³He reactions have been measured at the beam kinetic energies T _p= 1360 MeV and T _p= 1450 MeV using the CELSIUS/WASA detector setup. At both energies, the differential cross-section of the meson in the pd ³He reaction shows a strong forward-backward asymmetry in the CMS. The ratio between the pd ³He and pd ³He cross-sections has been analysed in terms of isospin amplitudes. The reconstructed invariant-mass distributions of the ,

³He and

³He2 systems provide hints on the role of nucleon resonances in the 3 production process.