Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 14: Poster Session: Heavy Ions

HK 14.4: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

Light clusters in nuclear matter of finite temperature — •M. Beyer¹, S. Strauss¹, P. Schuck², and S.A. Sofianos³ — ¹FB Physik, U Rostock, Germany — ²IPN Orsay, France — ³UNISA, Pretoria, South Africa

We investigate properties and the distribution of light nuclei (A<4) in symmetric nuclear matter of finite temperature within a microscopic framework. For this purpose we have solved few-body Alt-Grassberger-Sandhas type equations for quasi-nucleons that include self-energy corrections and Pauli blocking in a systematic way. In a statistical model we find a significant influence in the composition of nuclear matter if medium effects are included in the microscopic calculation of nuclei. If multiplicities are frozen out at a certain time (or volume), we expect significant consequences for the formation of light fragments in a heavy ion collision. Indeed the systematic inclusion of medium effects leads to an ordering of multiplicities opposite to the law of mass action of ideal components. This is necessary to explain the large abundance of α-particles in a heavy ion collision that are otherwise largely suppressed in an ideal equilibrium scenario.

Work supported by Deutsche Forschungsgemeinschaft.