dorsal/arxiv
View SchemaIsospin in Reaction Dynamics. The Case of Dissipative Collisions at Fermi Energies
| Authors | M. Di Toro |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0501042 |
| URL | https://arxiv.org/abs/nucl-th/0501042 |
| DOI | 10.1142/9789812701565_0020 |
Abstract
A key question in the physics of unstable nuclei is the knowledge of the $EOS$ for asymmetric nuclear matter ($ANM$) away from normal conditions. We recall that the symmetry energy at low densities has important effects on the neutron skin structure, while the knowledge in high densities region is crucial for supernovae dynamics and neutron star properties. The $only$ way to probe such region of the isovector $EOS$ in terrestrial laboratories is through very dissipative collisions of asymmetric (up to exotic) heavy ions from low to relativistic energies. A general introduction to the topic is firstly presented. We pass then to a detailed discussion on the $neck-fragmentation$ process as the main dissipative mechanism at the Fermi energies and to the related isospin dynamics. From Stochastic Mean Field simulations the isospin effects on all the phases of the reaction dynamics are thoroughly analysed, from the fast nucleon emission to the mid-rapidity fragment formation up to the dynamical fission of the $spectator$ residues. Simulations have been performed with an increasing stiffness of the symmetry term of the $EOS$. Some differences have been noticed, especially for the fragment charge asymmetry. New isospin effects have been revealed from the correlation of fragment asymmetry with dynamical quantities at the freeze-out time. A series of isospin sensitive observables to be further measured are finally listed.
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"abstract": "A key question in the physics of unstable nuclei is the knowledge of the\n$EOS$ for asymmetric nuclear matter ($ANM$) away from normal conditions. We\nrecall that the symmetry energy at low densities has important effects on the\nneutron skin structure, while the knowledge in high densities region is crucial\nfor supernovae dynamics and neutron star properties. The $only$ way to probe\nsuch region of the isovector $EOS$ in terrestrial laboratories is through very\ndissipative collisions of asymmetric (up to exotic) heavy ions from low to\nrelativistic energies. A general introduction to the topic is firstly\npresented. We pass then to a detailed discussion on the $neck-fragmentation$\nprocess as the main dissipative mechanism at the Fermi energies and to the\nrelated isospin dynamics. From Stochastic Mean Field simulations the isospin\neffects on all the phases of the reaction dynamics are thoroughly analysed,\nfrom the fast nucleon emission to the mid-rapidity fragment formation up to the\ndynamical fission of the $spectator$ residues. Simulations have been performed\nwith an increasing stiffness of the symmetry term of the $EOS$.\n Some differences have been noticed, especially for the fragment charge\nasymmetry. New isospin effects have been revealed from the correlation of\nfragment asymmetry with dynamical quantities at the freeze-out time. A series\nof isospin sensitive observables to be further measured are finally listed.",
"arxiv_id": "nucl-th/0501042",
"authors": [
"M. Di Toro"
],
"categories": [
"nucl-th"
],
"doi": "10.1142/9789812701565_0020",
"title": "Isospin in Reaction Dynamics. The Case of Dissipative Collisions at Fermi Energies",
"url": "https://arxiv.org/abs/nucl-th/0501042"
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