Photoabsorption on nuclei

被引：59

作者：

Effenberger, M

Hombach, A

Teis, S

Mosel, U

机构：

[1] Inst. für Theoretische Physik, Universität Giessen, D-35392 Giessen

来源：

NUCLEAR PHYSICS A | 1997年 / 613卷 / 04期

关键词：

total photonuclear cross section; collision broadening;

D O I：

10.1016/S0375-9474(96)00408-3

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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 --> NN 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.

引用

页码：353 / 370

页数：18

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