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Study of High Energy Heavy-Ion Collisions in a Relativistic BUU-Approach with Momentum-Dependent Mean-Fields | | Tomoyuki Maruyama
; Wolfgang Cassing
; Ulrich Mosel
; Stefan Teis
; Klaus Weber
; | | Date: |
23 Jul 1993 | | Journal: | Nucl.Phys. A573 (1994) 653-675 | | Subject: | nucl-th | | Affiliation: | Institut fuer Theoretische Physik, Universitaet Giessen, D-35392 Giessen, F. R. Germany | | Abstract: | We introduce momentum-dependent scalar and vector fields into the Lorentz covariant relativistic BUU- (RBUU-) approach employing a polynomial ansatz for the relativistic nucleon-nucleon interaction. The momentum-dependent parametrizations are shown to be valid up to about 1 GeV/u for the empirical proton-nucleus optical potential. We perform numerical simulations for heavy-ion collisions within the RBUU-approach adopting momentum-dependent and momentum-independent mean-fields and calculate the transverse flow in and perpendicular to the reaction plane, the directivity distribution as well as subthreshold K+-production. By means of these observables we discuss the particular role of the momentum-dependent forces and their implications on the nuclear equation of state. We find that only a momentum-dependent parameter-set can explain the experimental data on the transverse flow in the reaction plane from 150 - 1000 MeV/u and the differential K+-production cross sections at 1 GeV/u at the same time. | | Source: | arXiv, nucl-th/9307024 | | Services: | Forum | Review | PDF | Favorites | |
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