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000135850 0881_ $$aJuel-4017
000135850 088__ $$2JUEL$$aJuel-4017
000135850 084_0 $$2ZB$$aPJE - Atomic collision processes
000135850 1001_ $$0P:(DE-Juel1)VDB29957$$aCzyzykiewicz, Rafal$$b0$$eCorresponding author$$ufzj
000135850 245__ $$an and n' meson production in the quasi-free proton-neutron collisions at the COS-11 facility
000135850 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2002
000135850 300__ $$a71 S.
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000135850 4900_ $$0PERI:(DE-600)2414853-2$$aBerichte des Forschungszentrums Jülich$$v4017
000135850 500__ $$aRecord converted from JUWEL: 18.07.2013
000135850 520__ $$aBoth, the structure of the $\eta$' meson as well as its production mechanism are still under strong discussion and debate. The most possible hypothesis concerning the explanation of the almost three times larger mass for this meson observed experimentally relative to the theoretically calculated mass is a gluonium admixture to the $\eta$' wave function. This gluonium admixture should reflect itself in the production yield of the $\eta$' meson in proton-neutron collisions. Since the production of $\eta$' meson through the gluonium exchange is isospin independent, the ratio R$_{\nu}$ = $\frac{\sigma(pn \rightarrow pn\eta)}{\sigma(pp \rightarrow pp \eta)}$ close to threshold is expected to be R$_{\eta}$ = 1, after corrections for initial and final state interactions. The close to threshold $\eta$' production in proton-proton collisions has already been investigated at the COSY-11 facility. Cross section values in the threshold region have been measured. However, until now no data have been taken for the $\eta$' meson production in the proton-neutron collision. In order to investigate the $\eta$' production in proton-neutron collisions at the COSY synchrotron, the COSY-11 facility has been equipped with two new subsystems, namely the neutron detector and the spectator counter. The optimization of the topography for these additional detectors, the selection of the most suitable beam momentum and a discussion for the method of luminosity determination for the quasi-free pn $\rightarrow$ pn$\eta$($\eta$') reactions are presented in this thesis. Rates for the production of $\eta$ and $\eta$' mesons in proton-neutron collisions at COSY-11 have been estimated. For the calculations a special fast program has been written.
000135850 540__ $$aNeither this book nor any part of it may be reproduced or transmitted in any form or by any  means, electronic or mechanical, including photocopying, microfilming, and recording, or by any information storage and retrieval  system, without permission in writing from the publisher.
000135850 650_4 $$aCOSY
000135850 650_4 $$aproton
000135850 650_4 $$aneutron
000135850 650_4 $$aatomic collision
000135850 650_4 $$asynchrotron
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