Near threshold production of the eta meson via the quasi-free pn --> pn eta reaction

Abstract

Total cross sections for the quasi-free pn --> pn eta reaction in the range from the kinematical threshold up to 20 MeV excess energy have been determined. At threshold they exceed corresponding cross sections for the pp --> pp eta reaction by a factor of about three in contrast to the factor of six established for higher excess energies. To large extent, the observed decrease of the ratio sigma(pn --> pn eta)/sigma(pp --> pp eta) towards threshold may be assigned to the different energy dependence of the proton-proton and proton-neutron final state interactions. The experiment has been conducted using a proton beam of the cooler synchrotron COSY and a cluster jet deuteron target. The proton-neutron reactions were tagged by the spectator proton whose momentum was measured for each event. Protons and neutron outgoing from the pn --> pn eta reaction have been registered by means of the COSY-11 facility, an apparatus dedicated for threshold meson production.

arXiv comment15 pages, 6 figures, submitted to Phys. Rev. C

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Cited by in corpus (14)

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• Combined analysis of eta' production reactions: gamma N -> eta' N, N N -> N N eta', and pi N -> eta' N
• A versatile method for simulating pp -> ppe+e- and dp -> pne+e-p_spec reactions
• Few-body aspects of the near threshold pseudoscalar meson production
• Study of the eta meson production with the polarised proton beam
• Upper limit of the total cross section for the pn --> pn eta' reaction
• Near-threshold $\eta$ production in $pp$ collisions
• Anomalous glue, eta and eta-prime mesons
• Determination of the analysing power for the $\vec{p}p\to pp\eta$ reaction using WASA-at-COSY detector system
• Spin dependence of η meson production in proton-proton collisions close to threshold
• Omega and Eta (Eta-prime) mesons from NN and ND collisions at intermediate energies
• Production and interaction of the eta meson with nucleons and nuclei
• Studies of properties of the eta' meson at the COSY-11 facility