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Compton scattering from the free and bound proton at backward angles above π-threshold

Wissmann, F. and Kuhr, V. and Jahn, O. and Vorwerk, H. and Achenbach, P. and Ahrens, J. and Arends, H. J. and Beck, R. and Camen, M. and Caselotti, G. and Heid, E. and Hejny, V. and Jennewein, P. and Kondratjev, R. and Kossert, K. and Kotulla, M. and Krusche, B. and Lang, M. and Leukel, R. and Levchuk, M. I. and Lisin, V. and Metag, V. and Novotny, R. and de Leon, V. O. and Polonski, A. and Preobrashenskij, I. and Rambo, F. and Rosenkranz, D. and Schilling, E. and Schmidt, A. and Schumacher, M. and Seitz, B. and Siodlaczek, U. and Stroher, H. and Thomas, A. and Walcher, T. and Weiss, J. and Wolf, M. and Zapadtka, F.. (1999) Compton scattering from the free and bound proton at backward angles above π-threshold. Nuclear physics. A, Nuclear and hadronic physics, Vol. 660, H. 2. pp. 232-245.

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Official URL: http://edoc.unibas.ch/dok/A5261973

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Abstract

Differential cross sections for Compton scattering from the free proton at Theta(gamma)(lab) = 130.7 degrees in the energy region from 200 MeV to 410 MeV and far quasi-free Compton scattering from the proton bound in the deuteron at Theta(gamma)(lab) = 148.8 degrees in the energy region from 200 MeV to 290 MeV have been measured. The free proton data are in agreement with dispersion-theory predictions based on standard parameters. The difference of the proton polarizabilities has been extracted from the quasi-free data. Our result, - = [9.1 +/- 1.7(stat + syst) +/- 1.2(mod)] x 10(-4) fm(3), is in reasonable agreement with the world average of the free proton data if the backward spin polarizability gamma(pi) is taken to be -37.6 x 10(-4) fm(4) as predicted by dispersion theory in agreement with many theoretical calculations. This implies that quasi-free Compton scattering may also be used to determine the electromagnetic polarizabilities of the neutron. No indication has been found of a recently suggested new contribution to gamma(pi).
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:North Holland
ISSN:0375-9474
Note:Variant title: Compton scattering from the free and bound proton at backward angles above pi-threshold -- Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:22 Mar 2012 14:25
Deposited On:22 Mar 2012 13:46

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