dorsal/arxiv
View SchemaDetermination of the Mean-Field Momentum-Dependence using Elliptic Flow
| Authors | P. Danielewicz |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9912027 |
| URL | https://arxiv.org/abs/nucl-th/9912027 |
| DOI | 10.1016/S0375-9474(00)00083-X |
| Journal | Nucl.Phys. A673 (2000) 375-410 |
Abstract
Midrapidity nucleon elliptic flow is studied within the Boltzmann-equation simulations of symmetric heavy-ion collisions. The simulations follow a lattice Hamiltonian extended to relativistic transport. It is demonstrated that in the peripheral heavy-ion collisions the high-momentum elliptic flow is strongly sensitive to the momentum dependence of mean field at supranormal densities. The high transverse-momentum particles are directly and exclusively emitted from the high-density zone in the collisions, while remaining particles primarily continue along the beam axis. The elliptic flow was measured by the KaoS Collaboration as a function of the transverse momentum at a number of impact parameters in Bi + Bi collisions at 400, 700, and 1000 MeV/nucleon. The observed elliptic anisotropies in peripheral collisions, which quickly rise with momentum, can only be explained in simulations when assuming a strong momentum dependence of nucleonic mean field. This momentum dependence must strengthen with the rise of density above normal. The mean-field parametrizations, which describe the data in simulations with various success, are confronted with mean fields from microscopic nuclear-matter calculations. Two of the microscopic potentials in the comparisons have unacceptably weak momentum-dependencies at supranormal densities. The optical potentials from the Dirac-Brueckner-Hartree-Fock calculations, on the other hand, together with the UV14 + TNI potential from variational calculations, agree rather well within the region of sensitivity with the parametrized potentials that best describe the data.
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"abstract": "Midrapidity nucleon elliptic flow is studied within the Boltzmann-equation\nsimulations of symmetric heavy-ion collisions. The simulations follow a lattice\nHamiltonian extended to relativistic transport. It is demonstrated that in the\nperipheral heavy-ion collisions the high-momentum elliptic flow is strongly\nsensitive to the momentum dependence of mean field at supranormal densities.\nThe high transverse-momentum particles are directly and exclusively emitted\nfrom the high-density zone in the collisions, while remaining particles\nprimarily continue along the beam axis. The elliptic flow was measured by the\nKaoS Collaboration as a function of the transverse momentum at a number of\nimpact parameters in Bi + Bi collisions at 400, 700, and 1000 MeV/nucleon. The\nobserved elliptic anisotropies in peripheral collisions, which quickly rise\nwith momentum, can only be explained in simulations when assuming a strong\nmomentum dependence of nucleonic mean field. This momentum dependence must\nstrengthen with the rise of density above normal. The mean-field\nparametrizations, which describe the data in simulations with various success,\nare confronted with mean fields from microscopic nuclear-matter calculations.\nTwo of the microscopic potentials in the comparisons have unacceptably weak\nmomentum-dependencies at supranormal densities. The optical potentials from the\nDirac-Brueckner-Hartree-Fock calculations, on the other hand, together with the\nUV14 + TNI potential from variational calculations, agree rather well within\nthe region of sensitivity with the parametrized potentials that best describe\nthe data.",
"arxiv_id": "nucl-th/9912027",
"authors": [
"P. Danielewicz"
],
"categories": [
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"doi": "10.1016/S0375-9474(00)00083-X",
"journal_ref": "Nucl.Phys. A673 (2000) 375-410",
"title": "Determination of the Mean-Field Momentum-Dependence using Elliptic Flow",
"url": "https://arxiv.org/abs/nucl-th/9912027"
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