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Effects of in-medium cross-sections and of optical potential onpre-equilibrium emission and on formation of a thermal source are investigatedby comparing the results of transport simulations with experimental resultsfrom the p+{197}Au reaction at 6.2-14.6 GeV/c. The employed transport modelincludes light composite-particle production and allows for inclusion ofin-medium particle-particle cross-section reduction and of momentum dependencein the particle optical-potentials. Compared to the past, the modelincorporates improved parameterizations of elementary high-energy processes.The simulations indicate that the majority of energy deposition occurs duringthe first ~25 fm/c of a reaction. This is followed by a pre-equilibriumemission and readjustment of system density and momentum distribution toward anequilibrated system. Good agreement with data, on the d/p and t/p yield ratiosand on the residue mass and charge numbers, is obtained at the time of ~ 65fm/c from the start of a reaction, provided reduced in-medium cross-sectionsand momentum-dependent optical potentials are employed in the simulations. Bythen, the pre-equilibrium nucleon and cluster emission, as well as mean-fieldreadjustments, drive the system to a state of depleted average density,rho/rho_{0} ~ 1/4-1/3 for central collisions, and low-to-moderate excitation,i.e. the region of nuclear liquid-gas phase transition.Comment: 35 pages, 14 figure

physical review. c. nuclear physics/physical review. c, nuclear physics

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Effects of in-medium cross sections and optical potential on thermal-source formation inp+Au197reactions at6.2<…