Threshold enhancement in eta photoproduction from H-2 and He-4

Hejny, V. et al. (2002) Threshold enhancement in eta photoproduction from H-2 and He-4. European Physical Journal A, 13(4), 493 -499. (doi:10.1140/epja/iepja1345)

Abstract

The photoproduction of eta-mesons from H-2 and He-4 has been studied for energies close to the production thresholds. The experiments were carried out with the tagged photon beam of the Mainz MAMI accelerator. The eta-mesons were detected via their two photon decays with the electromagnetic calorimeter TAPS. Total cross-sections, angular and momentum distributions of the eta-mesons have been determined for both reactions. The total cross-sections in the threshold region show a large enhancement over the predictions of a participant-spectator model, indicating significant final-state interaction effects. The results are compared to recent model calculations taking into account nucleon-nucleon and nucleon-eta final-state interaction effects on different levels of sophistication

• Item Type: Articles
• Additional Information: Thomson UT: 176080500012
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: MacGregor, Professor I and Annand, Dr John
• Authors: Hejny, V., Weiss, J., Achenbach, P., Ahrens, J., Annand, J.R.M., Beck, R., Kotulla, M., Krusche, B., Kuhr, V., Leukel, R., MacGregor, I.J.D., Metag, V., Novotny, R., de Leon, V.O., Rambo, F., Schmidt, A., Schumacher, M., Siodlaczek, U., Stroher, H., Wissmann, F., and Wolf, M.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: European Physical Journal A
• Publisher: Springer
• ISSN: 1434-6001
• ISSN (Online): 1434-601X