Mean fields in colliding nuclear matter
Abstract
The momentumspace configuration of the participant nucleons in the early stage of heavyion collisions can be described by a colliding nuclear matter configuration, i.e. by two Lorentz elongated Fermi ellipsoids. We introduce this configuration in the framework of the Hartree approximation of the σωmodel. The configuration and the mean fields are constructed selfconsistently, respecting the Pauli principle for interpenetrating ellipsoids at low relative velocity in a covariant and density conserving manner. In a second step we approximately construct mean fields for these configurations in the context of Brueckner theory. To do this we parametrize the real part of the selfenergy of relativistic Brueckner calculations for equilibrated nuclear matter (oneFermi sphere) in a Hartree scheme to obtain momentum and densitydependent coupling parameters. With these we calculate the scalar and vector selfenergy of a nucleon in colliding nuclear matter consistently with the configuration. The mean selfenergy components show strong correlation and exchange effects. The results can be used to improve relativistic transport calculations for heavyion collisions.
 Publication:

Nuclear Physics A
 Pub Date:
 February 1996
 DOI:
 10.1016/03759474(96)000279
 Bibcode:
 1996NuPhA.601..473S