Coherent and incoherent π0 photoproduction from the deuteron
| Autor: | M. Kotulla, J. Ahrens, V. Hejny, M. Schepkin, J. C. McGeorge, Th. Walcher, R. Bilger, R. W. Novotny, H. Clement, A. Schmidt, I. Seluzhenkov, Matthias Wolf, V. Metag, V. Olmos de León, J. R. M. Annand, U. Siodlaczek, F. Wissmann, R. Beck, H. J. Arends, F. Rambo, J. Weiß, P. Achenbach, V. Kuhr, G. J. Wagner, R. Leukel, H. Ströher, B. Krusche |
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| Rok vydání: | 2001 |
| Předmět: |
Physics
Nuclear and High Energy Physics Range (particle radiation) Photon Missing energy Spectrometer 010308 nuclear & particles physics Hadron 01 natural sciences 7. Clean energy Nuclear physics Deuterium 0103 physical sciences Nuclear fusion Neutron Atomic physics Nuclear Experiment 010306 general physics |
| Zdroj: | The European Physical Journal A. 10:365-371 |
| ISSN: | 1434-601X 1434-6001 |
| Popis: | Differential cross-sections for the reactions d(gamma,pi (o))d and d(gamma,pi (o))pn have been measured at MAMI with the TAPS detector setup in the energy range 140 MeV > E- > 306 MeV. By use of the Glasgow tagging spectrometer an 0.8 MeV energy resolution for photons incident on the target was achieved. The (o) missing energy resolution was sufficient for a reliable separation of coherent and incoherent channels. The data for the break-up channel exhibit very strong final state interaction effects, whereas the observed angular dependence of the inclusive process d(gamma, pi (o))X is in quantitative agreement with predictions for a quasi-free process. The observed absolute d(gamma, pi (o))X cross-sections, on, the other hand, are significantly smaller than predicted by the quasi-free process for E-gamma greater than or similar to 250 MeV. Associating this failure with the pi (o) photoproduction on the neutron would suggest that its cross-section is up to 25% below the presently believed value. |
| Databáze: | OpenAIRE |
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