Exclusive measurement of coherent eta-photoproduction from the deuteron

Weiss, J Achenbach, P Ahrens, J Annand, JRM Beck, R Hejny, V Kellie, JD Kleber, V Kotulla, M Krusche, B Kuhr, V Leukel, R Metag, V de Leon, VMO Rambo, F Schmidt, A Siodlaczek, U Stroher, H Wissmann, F Wolf, M

J. Weiss et al., Exclusive measurement of coherent eta-photoproduction from the deuteron, EUR PHY J A, 11(4), 2001, pp. 371-374

18

INGLESE

Article

Physics

EUROPEAN PHYSICAL JOURNAL A

1434-6001 → ACNP

11

4

2001

371 - 374

ISI

1434-6001(200108)11:4<371:EMOCEF>2.0.ZU;2-G

Coherent photoproduction of eta -mesons from the deuteron has been measured from threshold up to E-gamma approximate to 750 MeV using the photon spect rometer TAPS at the tagged photon facility at the Mainz microtron MAMI. For the first time, differential coherent cross-sections have been deduced fro m the coincident detection of the eta -meson and the recoil deuteron. A mis sing-energy analysis was used for the suppression of background events so t hat a very clean identification of coherent eta -photoproduction was achiev ed. The resulting cross-sections agree with previous experimental results e xcept for angles around 90 degrees in the gammad c.m. system where they are smaller. They are compared to various model calculations.