dorsal/arxiv
View SchemaSpin-Isospin Modes in Heavy-Ion Collisions I: Nuclear Matter at Finite Temperatures
| Authors | J. Helgesson, J. Randrup |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9412019 |
| URL | https://arxiv.org/abs/nucl-th/9412019 |
| DOI | 10.1006/aphy.1995.1106 |
| Journal | Annals Phys. 244 (1995) 12-66 |
Abstract
With a view towards implementation in microscopic transport simulations of heavy-ion collisions, the properties of spin-isospin modes are studied in nuclear matter consisting of nucleons and Delta isobars that interact by the exchange of pi and rho mesons. For a standard p-wave interaction and an effective g' short-range interaction, the dispersion relations for the spin- isospin modes, and the associated amplitudes, are calculated at various nuclear densities and temperatures, within the random-phase approximation. Quantities of physical interest are then extracted, including the total and partial Delta decay widths and the Delta cross sections in the nuclear medium. The self-consistent inclusion of the Delta width has a strong effect on the Delta cross sections at twice normal nuclear density, as compared with the result of ignoring the width. Generally, the obtained quantities exhibit a strong density dependence, but are fairly insensitive to the temperature, at least up to T=25 MeV. Finally, it is described how these in-medium effects may be consistently included into microscopic transport simulations of nuclear collisions, and the improvements over previous approaches are discussed.
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"abstract": "With a view towards implementation in microscopic transport simulations of\nheavy-ion collisions, the properties of spin-isospin modes are studied in\nnuclear matter consisting of nucleons and Delta isobars that interact by the\nexchange of pi and rho mesons. For a standard p-wave interaction and an\neffective g\u0027 short-range interaction, the dispersion relations for the spin-\nisospin modes, and the associated amplitudes, are calculated at various nuclear\ndensities and temperatures, within the random-phase approximation. Quantities\nof physical interest are then extracted, including the total and partial Delta\ndecay widths and the Delta cross sections in the nuclear medium. The\nself-consistent inclusion of the Delta width has a strong effect on the Delta\ncross sections at twice normal nuclear density, as compared with the result of\nignoring the width. Generally, the obtained quantities exhibit a strong density\ndependence, but are fairly insensitive to the temperature, at least up to T=25\nMeV. Finally, it is described how these in-medium effects may be consistently\nincluded into microscopic transport simulations of nuclear collisions, and the\nimprovements over previous approaches are discussed.",
"arxiv_id": "nucl-th/9412019",
"authors": [
"J. Helgesson",
"J. Randrup"
],
"categories": [
"nucl-th"
],
"doi": "10.1006/aphy.1995.1106",
"journal_ref": "Annals Phys. 244 (1995) 12-66",
"title": "Spin-Isospin Modes in Heavy-Ion Collisions I: Nuclear Matter at Finite Temperatures",
"url": "https://arxiv.org/abs/nucl-th/9412019"
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