Göttingen 1997 – wissenschaftliches Programm
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HK: Hadronen und Kerne
HK 3: Schwerionenreaktionen, niedrige Energien
HK 3.8: Vortrag
Montag, 24. März 1997, 16:00–16:15, HS D
Nucleon-Nucleon cross sections in hot nuclear matter — •A. Schnell1, G. Röpke1, H.-J. Schulze2, and U. Lombardo3 — 1MPG-AG “Theoretische Vielteilchenphysik”, Universit"at Rostock, D-18051 Rostock — 2Sezione INFN, Università Catania, Corso Italia 57, I-95129 Catania, Italy — 3Dipartimento di Fisica, Università Catania, Corso Italia 57, I-95129 Catania, Italy
The in-medium nucleon-nucleon cross section is a basic input quantity for the numerical simulation of heavy-ion collisions at intermediate energies [1]. Based on the Paris potential as the nucleon-nucleon interaction we present a microscopic calculation of neutron-proton and neutron-neutron cross sections in symmetric nuclear matter. Using the thermodynamic T matrix approach [2] we investigate the temperature and density dependence of this quantity in a systematic way. Since the cross section is a function of many variables we carry out an average procedure which is closely related to the occurrence of the cross section in the collisional integral in the BUU equation. Moreover, we provide linear or quadratic parametrizations of the density and temperature dependence of the averaged cross sections in order to make them easily accessable for practical applications.
[1] G.F. Bertsch and S. Das Gupta, Phys. Reports 137, 189 (1988).
[2] T. Alm, G. Röpke, and M. Schmidt, Phys. Rev C 50, 31 (1994).