Semiclassical transport of particles with dynamical spectral functions

被引：96

作者：

Cassing, W ^{[1
]}

Juchem, S ^{[1
]}

机构：

[1] Univ Giessen, Inst Theoret Phys, D-35392 Giessen, Germany

来源：

NUCLEAR PHYSICS A | 2000年 / 665卷 / 3-4期

关键词：

many-body theory; nuclear-reaction models and methods; low and intermediate energy heavy-ion reactions; relativistic heavy-ion collisions;

D O I：

10.1016/S0375-9474(99)00393-0

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：

The conventional transport of particles in the on-shell quasiparticle limit is extended to particles of finite life time by means of a spectral function A(X,P,M-2) for a particle moving in an area of complex self-energy Sigma(X)(ret) = Re Sigma(X)(ret) - i Gamma(x)/2. Starting from the Kadanoff-Baym equations we derive in first-older gradient expansion equations of motion for testparticles with respect to their time evolution in X,P and M-2. The off-shell propagation is demonstrated for a couple of model cases that simulate hadron-nucleus collisions. In case of nucleus-nucleus collisions the imaginary part of the hadron self-energy Gamma(X) is determined by the local space-time dependent collision rate dynamically. A first application is presented for A + A reactions up to 95 A MeV, where the effects from the off-shell propagation of nucleons are discussed with respect to high energy proton spectra, high energy photon production as well as kaon yields in comparison to the available data from GANIL. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：377 / 400

页数：24

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