Eur. Phys. J. A 10, 365-371
Coherent and incoherent photoproduction from the deuteronU. 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)
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