Eur. Phys. J. A 10, 365-371
Coherent and incoherent
photoproduction from the
deuteron
U. Siodlaczek1, P. Achenbach2, J. Ahrens3, J.R.M. Annand4, H.-J. Arends3, R. Beck3, R. Bilger1, H. Clement1, V. Hejny5, M. Kotulla2, B. Krusche6, V. Kuhr7, R. Leukel3, J.C. McGeorge4, V. Metag2, R. Novotny2, V. Olmos de León3, F. Rambo7, M. Schepkin8, A. Schmidt3, I. Seluzhenkov8, 9, H. Ströher5, G.J. Wagner1, Th. Walcher3, J. Weiß2, F. Wissmann7 and M. Wolf2
1 Physikalisches Institut, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
2 II. Physikalisches Institut, Universität Gieß en, D-35392 Gießen, Germany
3 Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany
4 Department of Physics and Astronomy, University of Glasgow, Glasgow G128 QQ, UK
5 Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
6 Institut für Physik und Astronomie, Universität Basel, Klingelbergstr. 82, CH-4056 Basel, Switzerland
7 II. Physikalisches Institut, Universität Göttingen, D-37073 Göttingen, Germany
8 Institute for Theoretical and Experimental Physics, Moscow 117218, Russia
9 Moscow State Engineering Physics Institute, Moscow 115409, Russia
(Received: 13 February 2001 / Revised version: 11 April 2001 Communicated by M. Garçon)
Abstract
Differential cross-sections for the reactions
and
have been measured at MAMI with the TAPS detector setup in
the energy range 140 MeV
MeV. By use of the Glasgow tagging
spectrometer an 0.8 MeV energy resolution for photons incident on the target
was achieved. The
missing energy resolution was sufficient for a
reliable separation of coherent and incoherent channels. The data for the
break-up channel exhibit very strong final state interaction effects, whereas
the observed angular dependence of the inclusive process
is
in quantitative
agreement with predictions for a quasi-free process. The observed absolute
cross-sections, on the other hand, are significantly smaller than
predicted by the quasi-free process for
MeV. Associating this failure with the
photoproduction on the neutron
would suggest that its cross-section is up to 25% below the presently believed
value.
13.60.Le - Meson production.
25.20.Lj - Photoproduction reactions.
© Società Italiana di Fisica, Springer-Verlag 2001