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

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dc.creatorMoskal, P.
dc.creatorCzyzykiewicz, R.
dc.creatorAdam, H. -H.
dc.creatorBass, S. D.
dc.creatorBudzanowski, A.
dc.creatorCzerwinski, E.
dc.creatorGil, D.
dc.creatorGrzonka, D.
dc.creatorJanusz, M.
dc.creatorJarczyk, L.
dc.creatorJohansson, T.
dc.creatorKamys, B.
dc.creatorKhoukaz, A.
dc.creatorKilian, K.
dc.creatorKlaja, P.
dc.creatorMajewski, J.
dc.creatorOelert, W.
dc.creatorPiskor-Ignatowicz, C.
dc.creatorPrzerwa, J.
dc.creatorRejdych, B.
dc.creatorRitman, J.
dc.creatorRozek, T.
dc.creatorSefzick, T.
dc.creatorSiemaszko, M.
dc.creatorSilarski, M.
dc.creatorSmyrski, J.
dc.creatorTaeschner, A.
dc.creatorWolke, M.
dc.creatorWuestner, P.
dc.creatorZielinski, M. J.
dc.creatorZipper, W.
dc.creatorZdebik, J.
dc.date2008-07-07
dc.date2008-10-07
dc.date.accessioned2026-07-07T12:42:34Z
dc.date.available2026-07-07T12:42:34Z
dc.descriptionTotal 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.
dc.description15 pages, 6 figures, submitted to Phys. Rev. C
dc.identifierhttps://arxiv.org/abs/0807.0722
dc.identifierhttp://arxiv.org/abs/0807.0722
dc.identifierPhys.Rev.C79:015208,2009
dc.identifierdoi:10.1103/PhysRevC.79.015208
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220123
dc.subjectHigh Energy Physics - Experiment
dc.titleNear threshold production of the eta meson via the quasi-free pn --> pn eta reaction
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