2017 Impact factor 2.799
Hadrons and Nuclei


Eur. Phys. J. A 11, 371-374 (2001)

Short Note

Exclusive measurement of coherent $\eta$-photoproduction from the deuteron

J. Weiß1, P. Achenbach2, J. Ahrens2, J.R.M. Annand3, R. Beck2, V. Hejny4, J.D. Kellie3, V. Kleber4, M. Kotulla1, B. Krusche5, V. Kuhr6, R. Leukel2, V. Metag1, V.M. Olmos de Léon2, F. Rambo6, A. Schmidt2, U. Siodlaczek7, H. Ströher4, F. Wissmann6 and M. Wolf1

1  II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, D-35392 Gießen, Germany
2  Institut für Kernphysik, Johannes-Gutenberg-Universität Mainz, Johannes-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
3  Department of Physics and Astronomy, University of Glasgow, Glasgow G128QQ, UK
4  Institut für Kernphysik, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
5  Departement für Physik und Astronomie, Universität Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
6  II. Physikalisches Institut, Georg-August-Universität Göttingen, Bunsenstr. 7-9, D-37073 Göttingen, Germany
7  Physikalisches Institut, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany

Bernd.Krusche@unibas.ch

(Received: 5 April 2001 / Revised version: 14 July 2001 Communicated by P. Schuck)

Abstract
Coherent photoproduction of $\eta$-mesons from the deuteron has been measured from threshold up to $E_\gamma\approx$ 750 MeV using the photon spectrometer TAPS at the tagged photon facility at the Mainz microtron MAMI. For the first time, differential coherent cross-sections have been deduced from the coincident detection of the $\eta$-meson and the recoil deuteron. A missing-energy analysis was used for the suppression of background events so that a very clean identification of coherent $\eta$-photoproduction was achieved. The resulting cross-sections agree with previous experimental results except for angles around 90° in the ${\gamma}d$ c.m. system where they are smaller. They are compared to various model calculations.

PACS
13.60.Le - Meson production.
14.20.Gk - Baryon resonances with S=0 .
25.20.Lj - Photoproduction reactions.

© Società Italiana di Fisica, Springer-Verlag 2001