Münster 2011 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 59: Hadronenstruktur und -spektroskopie X
HK 59.9: Talk
Thursday, March 24, 2011, 18:45–19:00, HS3
Σ− hyperon production in pn interactions at ANKE/COSY — •Egor Shikov — Petersburg Nuclear Physics Institute, Gatchina, Russia — Forschungszentrum Jülich, Germany
The production of light hyperons in pp and pn interaction constitutes a large part of the scientific program at the ANKE-spectrometer, which is an internal-beam experiment at the Cooler Synchrotron (COSY).
In this work the pd→ psppK+Σ− reaction is investigated using two samples of data with 2915 MeV/c and 3015 MeV/c beam momenta. The deuteron target has been used as an effective neutron target by measurement of the spectator proton’s momentum. Thus events of the pn→ pK+Σ− reaction could be reconstructed by using the spectator approximation. The Fermi motion of on-shell neutron allows to cover a wide range of excess energies (Q = 30 - 130 MeV) for this reaction.
Reaction identification has been done using the missing-mass technique. About 1000 events associated with Σ− hyperon production are observed in a peak of missing mass for events with detected K+ meson together with high momentum and spectator protons. The normalization procedure has been done using events of proton-deuteron elastic scattering.
Preliminary results for the energy dependence of the pn→ pK+Σ− total cross section will be presented.
This work is supported by COSY-FFE.