dorsal/arxiv
View SchemaEffects of in-medium cross-sections and optical potential on thermal-source formation in p+197Au reactions at 6.2-14.6 GeV/c
| Authors | S. Turbide, L. Beaulieu, P. Danielewicz, V. E. Viola, R. Roy, K. Kwiatkowski, W. -C. Hsi, G. Wang, T. Lefort, D. S. Bracken, H. Breuer, E. Cornell, F. Gimeno-Nogues, D. S. Ginger, S. Gushue, R. Huang, R. Korteling, W. G. Lynch, K. B. Morley, E. Ramakrishnan, L. P. Remsberg, D. Rowland, M. B. Tsang, H. Xi, S. J. Yennello |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0402071 |
| URL | https://arxiv.org/abs/nucl-th/0402071 |
| DOI | 10.1103/PhysRevC.70.014608 |
| Journal | Phys.Rev. C70 (2004) 014608 |
Abstract
Effects of in-medium cross-sections and of optical potential on pre-equilibrium emission and on formation of a thermal source are investigated by comparing the results of transport simulations with experimental results from the p+{197}Au reaction at 6.2-14.6 GeV/c. The employed transport model includes light composite-particle production and allows for inclusion of in-medium particle-particle cross-section reduction and of momentum dependence in the particle optical-potentials. Compared to the past, the model incorporates improved parameterizations of elementary high-energy processes. The simulations indicate that the majority of energy deposition occurs during the first ~25 fm/c of a reaction. This is followed by a pre-equilibrium emission and readjustment of system density and momentum distribution toward an equilibrated system. Good agreement with data, on the d/p and t/p yield ratios and on the residue mass and charge numbers, is obtained at the time of ~ 65 fm/c from the start of a reaction, provided reduced in-medium cross-sections and momentum-dependent optical potentials are employed in the simulations. By then, the pre-equilibrium nucleon and cluster emission, as well as mean-field readjustments, 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.
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"abstract": "Effects of in-medium cross-sections and of optical potential on\npre-equilibrium emission and on formation of a thermal source are investigated\nby comparing the results of transport simulations with experimental results\nfrom the p+{197}Au reaction at 6.2-14.6 GeV/c. The employed transport model\nincludes light composite-particle production and allows for inclusion of\nin-medium particle-particle cross-section reduction and of momentum dependence\nin the particle optical-potentials. Compared to the past, the model\nincorporates improved parameterizations of elementary high-energy processes.\nThe simulations indicate that the majority of energy deposition occurs during\nthe first ~25 fm/c of a reaction. This is followed by a pre-equilibrium\nemission and readjustment of system density and momentum distribution toward an\nequilibrated system. Good agreement with data, on the d/p and t/p yield ratios\nand on the residue mass and charge numbers, is obtained at the time of ~ 65\nfm/c from the start of a reaction, provided reduced in-medium cross-sections\nand momentum-dependent optical potentials are employed in the simulations. By\nthen, the pre-equilibrium nucleon and cluster emission, as well as mean-field\nreadjustments, drive the system to a state of depleted average density,\nrho/rho_{0} ~ 1/4-1/3 for central collisions, and low-to-moderate excitation,\ni.e. the region of nuclear liquid-gas phase transition.",
"arxiv_id": "nucl-th/0402071",
"authors": [
"S. Turbide",
"L. Beaulieu",
"P. Danielewicz",
"V. E. Viola",
"R. Roy",
"K. Kwiatkowski",
"W. -C. Hsi",
"G. Wang",
"T. Lefort",
"D. S. Bracken",
"H. Breuer",
"E. Cornell",
"F. Gimeno-Nogues",
"D. S. Ginger",
"S. Gushue",
"R. Huang",
"R. Korteling",
"W. G. Lynch",
"K. B. Morley",
"E. Ramakrishnan",
"L. P. Remsberg",
"D. Rowland",
"M. B. Tsang",
"H. Xi",
"S. J. Yennello"
],
"categories": [
"nucl-th",
"nucl-ex"
],
"doi": "10.1103/PhysRevC.70.014608",
"journal_ref": "Phys.Rev. C70 (2004) 014608",
"title": "Effects of in-medium cross-sections and optical potential on thermal-source formation in p+197Au reactions at 6.2-14.6 GeV/c",
"url": "https://arxiv.org/abs/nucl-th/0402071"
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