Bochum 1998 – scientific programme
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HK: Hadronen und Kerne
HK 56: Postersitzung
HK 56.7: Poster
Wednesday, March 18, 1998, 17:00–19:00, Foyer
Formation of correlations and energy-conservation at short time scales — •K. Morawetz1 and S. Koehler2 — 1AG Quantentheorie und Vielteilchensysteme, FB Physik Universität Rostock, Universitätsplatz 3, D-18051 Rostock — 2Department of Physics, University of Arizona, USA
The formation of correlations due to collisions in an interacting nucleonic system is investigated. Results from one-time kinetic equations are compared with the Kadanoff and Baym two-time equation with collisions included in second order Born approximation. A reasonable agreement is found for a proposed approximation of the memory effects by a finite duration of collisions. This form of collision integral is in agreement with intuitive estimates from Fermi’s golden rule. The formation of correlations and the build up time is calculated analytically for the high temperature and the low temperature limit. Different approximate expressions are compared with the numerical results. We calculate analytically the time dependent interaction energy and the formation time for Gauß- and Yukawa type of potentials.
[1] K. Morawetz, S. Koehler, Phys. Rev. C. sub