Threshold enhancement in eta photoproduction from 2H and 4He
Abstract
The photoproduction of eta-mesons from 2H and 4He 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.
Keywords
Cite
@article{arxiv.nucl-ex/0304005,
title = {Threshold enhancement in eta photoproduction from 2H and 4He},
author = {V. Hejny and J. Weiss and P. Achenbach and J. Ahrens and J. R. M. Annand and R. Beck and M. Kotulla and B. Krusche and V. Kuhr and R. Leukel and I. J. D. MacGregor and V. Metag and R. Novotny and V. Olmos de Leon and F. Rambo and A. Schmidt and M. Schumacher and U. Siodlaczek and H. Stroeher and F. Wissmann and M. Wolf},
journal= {arXiv preprint arXiv:nucl-ex/0304005},
year = {2008}
}
Comments
8 pages, 6 figures