Near-threshold production of the eta meson via the quasifree pn -> pn eta reaction
2009 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 79, no 1, 015208- p.Article in journal (Refereed) Published
Total cross sections for the quasifree 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 pn -> pn eta reaction by a factor of about 3 in contrast to the factor of 6 established for higher excess energies. To large extent, the observed decrease of the ratio s(pn -> pn eta)/s=sigma(pn -> pn eta) toward threshold may be assigned to the different energy dependence of the proton-proton and proton-neutron final-state interactions. The experiment was 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.
Place, publisher, year, edition, pages
2009. Vol. 79, no 1, 015208- p.
IdentifiersURN: urn:nbn:se:uu:diva-137331DOI: 10.1103/PhysRevC.79.015208ISI: 000262979900061OAI: oai:DiVA.org:uu-137331DiVA: diva2:378254