Photoabsorption on nuclei

Effenberger, M.; Hombach, A.; Teis, S.; Mosel, U.

doi:10.1016/S0375-9474(96)00408-3

Photoabsorption on nuclei

Jul, 1996

26 pages

Published in:

Nucl.Phys.A 613 (1997) 353-370

e-Print:

nucl-th/9607005 [nucl-th]

DOI:

10.1016/S0375-9474(96)00408-3

Report number:

UGI-96-13

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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

N \, R \to N \, N

, needed for the calculation of collision broadening, are obtained by detailed balance from a fit to

N \, N \to N \, N \, \pi

cross sections. We show that a reasonable collision broadening is not able to explain the experimentally observed disappearance of the

D_{13}(1520)

-resonance in the photoabsorption cross section on nuclei.

Note:

26 pages Latex including 9 postscript figures Report-no: UGI-96-13

25.20.-x
Total photonuclear cross section
Collision broadening
photon nucleus: interaction
interaction: photon nucleus
photon nucleon: interaction
interaction: photon nucleon
photon: absorption
absorption: photon
cross section: energy dependence

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