Photoabsorption on nuclei |
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| Institution: | 1. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;2. Center for Nuclear Study, University of Tokyo, Hongo, Tokyo 113-0033, Japan;3. Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan;4. Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA;5. Meme Media Laboratory, Hokkaido University, Sapporo-shi 060-0810, Japan;6. Center for Mathematical Sciences, University of Aizu, Ikki-machi, Aizu-Wakamatsu, Fukushima 965-8580, Japan |
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| Abstract: | We calculate the total photoabsorption cross section on nuclei in the energy range from 300 MeV to 1 GeV within the framework of a semi-classical phase space model. Besides medium modifications like Fermi motion and Pauli blocking we focus on the collision broadening of the involved resonances. The resonance contributions to the elementary cross section are fixed by fits to partial wave amplitudes of pion photoproduction. The cross sections for NR → NN, needed for the calculation of collision broadening, are obtained by detailed balance from a fit to NN → NNπ cross sections. We show that a reasonable collision broadening is not able to explain the experimentally observed disappearance of the D13(1520)-resonance in the photoabsorption cross section on nuclei. |
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