Threshold enhancement in η photoproduction from 2H and 4He
| Autor: | B. Krusche, J. R. M. Annand, A. Schmidt, R. W. Novotny, V. Metag, U. Siodlaczek, M. Kotulla, V. Hejny, V. Olmos de León, V. Kuhr, Matthias Wolf, Martin Schumacher, J. Weiß, F. Wissmann, R. Beck, J. Ahrens, Patrick Achenbach, R. Leukel, F. Rambo, H. Ströher, I. J. D. MacGregor |
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| Rok vydání: | 2002 |
| Předmět: |
Physics
Nuclear and High Energy Physics 010308 nuclear & particles physics Nuclear Theory Hadron 01 natural sciences 7. Clean energy Nuclear physics Momentum Electromagnetic calorimeter 0103 physical sciences Nuclear fusion High Energy Physics::Experiment Atomic physics Photon beam Nuclear Experiment 010306 general physics |
| Zdroj: | The European Physical Journal A. 13:493-499 |
| ISSN: | 1434-601X 1434-6001 |
| Popis: | The photoproduction of η-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 η-mesons were detected via their two photon decays with the electromagnetic calorimeter TAPS. Total cross-sections, angular and momentum distributions of the η-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-η final-state interaction effects on different levels of sophistication. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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