Freiburg 1999 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 12: Physik mit schweren Ionen II
HK 12.6: Gruppenbericht
Montag, 22. März 1999, 18:00–18:30, D
Virial corrections to simulations of heavy ion reactions — •K. Morawetz1, P. Lipavskyý2, V. Spička2, G. Kortemeyer3, Ch. Kuhrts1, and R. Nebauer1,4 — 1FB Physik, Universität Rostock, Universitätsplatz 3, D-18051 Rostock — 2Institute of Physics, Academy of Sciences, Cukrovarnická 10, 16200 Praha 6, Czech Republic — 3NSCL, Michigan State University, East Lansing, MI 48824-1321, USA — 4SUBATECH, Laboratoire de Physique Subatomique 4, Rue Alfred Kastler La Chantrerie, 44070 Nantes Cedex 03, France
Within QMD simulations we demonstrate the effect of virial corrections on heavy ion reactions. Unlike in standard codes, the binary collisions are treated as non-local so that the contribution of the collision flux to the reaction dynamics is covered. A comparison with standard QMD simulations shows that the virial corrections lead to a broader proton distribution bringing theoretical spectra closer towards experimental values of recent INDRA data. Complementary BUU simulations reveal that the non-locality enhances the collision rate in the early stage of the reaction. It suggests that the broader distribution appears due to an enhanced pre-equilibrium emission of particles.
[1] V. Špička, P. Lipavský, K. Morawetz, Phys. Rev. B. 55, 5084 (1997); 5095 (1997).
[2] P. Lipavský, K. Morawetz and V. Špička,, Rev. Mod. Phys., (1997), sub.
[3] V. Špička, P. Lipavský, and K. Morawetz, Phys. Lett. A 240, (1998), 160
[4] K. Morawetz, V. Špička, P. Lipavský, G. Kortemeyer, Ch. Kuhrts, R. Nebauer, Phys. Rev. Lett., (1998), in press