dorsal/arxiv
View SchemaNucleon-nucleon cross sections in neutron-rich matter and isospin transport in heavy-ion reactions at intermediate energies
| Authors | Bao-An Li, Lie-Wen Chen |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0508024 |
| URL | https://arxiv.org/abs/nucl-th/0508024 |
| DOI | 10.1103/PhysRevC.72.064611 |
| Journal | Phys.Rev.C72:064611,2005 |
Abstract
Nucleon-nucleon (NN) cross sections are evaluated in neutron-rich matter using a scaling model according to nucleon effective masses. It is found that the in-medium NN cross sections are not only reduced but also have a different isospin dependence compared with the free-space ones. Because of the neutron-proton effective mass splitting the difference between nn and pp scattering cross sections increases with the increasing isospin asymmetry of the medium. Within the transport model IBUU04, the in-medium NN cross sections are found to influence significantly the isospin transport in heavy-ion reactions. With the in-medium NN cross sections, a symmetry energy of $E_{sym}(\rho)\approx 31.6(\rho /\rho_{0})^{0.69}$ was found most acceptable compared with both the MSU isospin diffusion data and the presently acceptable neutron-skin thickness in $^{208}$Pb. The isospin dependent part $K_{asy}(\rho _{0})$ of isobaric nuclear incompressibility was further narrowed down to $-500\pm 50$ MeV. The possibility of determining simultaneously the in-medium NN cross sections and the symmetry energy was also studied. The proton transverse flow, or even better the combined transverse flow of neutrons and protons, can be used as a probe of the in-medium NN cross sections without much hindrance from the uncertainties of the symmetry energy.
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"abstract": "Nucleon-nucleon (NN) cross sections are evaluated in neutron-rich matter\nusing a scaling model according to nucleon effective masses. It is found that\nthe in-medium NN cross sections are not only reduced but also have a different\nisospin dependence compared with the free-space ones. Because of the\nneutron-proton effective mass splitting the difference between nn and pp\nscattering cross sections increases with the increasing isospin asymmetry of\nthe medium. Within the transport model IBUU04, the in-medium NN cross sections\nare found to influence significantly the isospin transport in heavy-ion\nreactions. With the in-medium NN cross sections, a symmetry energy of\n$E_{sym}(\\rho)\\approx 31.6(\\rho /\\rho_{0})^{0.69}$ was found most acceptable\ncompared with both the MSU isospin diffusion data and the presently acceptable\nneutron-skin thickness in $^{208}$Pb. The isospin dependent part $K_{asy}(\\rho\n_{0})$ of isobaric nuclear incompressibility was further narrowed down to\n$-500\\pm 50$ MeV. The possibility of determining simultaneously the in-medium\nNN cross sections and the symmetry energy was also studied. The proton\ntransverse flow, or even better the combined transverse flow of neutrons and\nprotons, can be used as a probe of the in-medium NN cross sections without much\nhindrance from the uncertainties of the symmetry energy.",
"arxiv_id": "nucl-th/0508024",
"authors": [
"Bao-An Li",
"Lie-Wen Chen"
],
"categories": [
"nucl-th",
"astro-ph",
"nucl-ex"
],
"doi": "10.1103/PhysRevC.72.064611",
"journal_ref": "Phys.Rev.C72:064611,2005",
"title": "Nucleon-nucleon cross sections in neutron-rich matter and isospin transport in heavy-ion reactions at intermediate energies",
"url": "https://arxiv.org/abs/nucl-th/0508024"
},
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