Temperature and thermodynamic instabilities in heavy ion collisions

Details Temperature and thermodynamic instabilities in heavy ion collisions Temperature and thermodynamic instabilities in heavy ion collisions

1997-05-13

arxiv.org/abs/nucl-th/9705023v2

Nucl.Phys. A626 (1997) 987-998

Physics

Nuclear Physics

Nuclear Theory

20 pages latex, 5 PS-figures, revised version (minor changes) accepted for publication in Nucl. Phys. A

Scientific paper

10.1016/S0375-9474(97)00467-3

We investigate thermodynamic properties and instability conditions in intermediate energy heavy ion reactions. We define locally thermodynamic variables, i.e. density, pressure and temperature, directly from the phase space distribution of a relativistic transport calculation. In particular, temperatures are determined by a fit to two covariant hot Fermi distributions thus taking into account possible anisotropic momentum configurations. We define instability independent from the nuclear matter spinodal by the criterion that the effective compressibility becomes negative. The method is applied to a semi-central Au on Au reaction at 600 MeV/nucleon. We investigate in particular the center of the participant and the spectator matter. In the latter we find a clear indication of instability with conditions of density and temperature that are consistent with experimental determinations.

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