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Dresden 2000 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 8: Theorie II

HK 8.6: Talk

Monday, March 20, 2000, 18:00–18:15, B 81

Formation of few-body clusters in nuclear matter — •M. Beyer1, P. Danielewicz2, C. Kuhrts1, G. Röpke1, W. Schadow3, P. Schuck4, and S. A. Sofianos51U Rostock — 2NSCL, E.-Lansing — 3TRIUMF, Vancouver — 4ISN, Grenoble — 5U Pretoria

The general focus is on correlations in interacting Fermi systems. Correlations lead to pairing, bound states, superconductivity, superfluidity, Bose-Einstein condensation etc., depending on the temperature and density of the system. The description of such phenomena is particularly challenging, since the quasi-particle picture reaches its limits. The framework to treat such strongly correlated many-body systems (generally in a nonequilibrium situation) is provided by the cluster expansion or Dyson equation approach.
We apply a medium modified few-body theory to evaluated the properties of light clusters (deuteron, triton, α-particle) in nuclear matter. Solving an in-medium AGS-equation we calculate the shift of bound state energies as well as the modification of reaction rates. As a special effect the disappearance of bound states in dense matter (Mott effect) is discussed.
These results are applied to calculated the time evolution of expanding nuclear matter as produced, e.g., in heavy ion collisions. Using a Boltzmann-Uehling-Uhlenbeck (BUU) approach the coupled equations for the nucleon and deuteron distribution functions are solved taking into account the medium dependence of the reaction rates (NdNNN, …). The results are compared with other approaches and the experimental data.

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