Dresden 2000 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 14: Postersitzung / Theorie
HK 14.37: Poster
Donnerstag, 23. März 2000, 10:15–12:45, B 113
Deuteron Formation in Heavy Ion Collisions — •Christiane Kuhrts1, Michael Beyer1, Gerd Röpke1, and Pawel Danielewicz2 — 1FB Physik, Universität Rostock,18051 Rostock — 2NSCL, Michigan State University, East Lansing, Michigan 48824, USA
We consider deuteron formation in heavy ion collisions at intermediate energies. The elementary reaction rates (Nd→ NNN etc.) in this context are calculated using the Faddeev equation which is consistently modified to include the self energy corrections and Pauli blocking factors due to surrounding nucleons. We have calculated the life time of deuteron fluctuations and the chemical relaxation time in nuclear matter for densities and temperatures typical for the final stage of a heavy ion reaction. A microscopic approach to describe a heavy ion collision uses the Boltzmann equation that requires reaction rates in the collision integrals. A coupled Boltzmann equation for nucleons and deuterons is numerically solved using in-medium (Nd↔ NNN) reaction rates. We find that the relaxation time scales as well as the number of emitted deuterons predicted by the Boltzmann-Uehling-Uhlenbeck simulation change when medium dependent rates are used.