dorsal/arxiv
View SchemaMultifragmentation in Xe(50A MeV)+Sn Confrontation of theory and data
| Authors | R. Nebauer, J. Aichelin, the INDRA collaboration |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9810008 |
| URL | https://arxiv.org/abs/nucl-th/9810008 |
| DOI | 10.1016/S0375-9474(99)00333-4 |
| Journal | Nucl.Phys. A658 (1999) 67-93 |
Abstract
We compare in detail central collisions Xe(50A MeV) + Sn, recently measured by the INDRA collaboration, with the Quantum Molecular Dynamics (QMD) model in order to identify the reaction mechanism which leads to multifragmentation. We find that QMD describes the data quite well, in the projectile/target region as well as in the midrapidity zone where also statistical models can be and have been employed. The agreement between QMD and data allows to use this dynamical model to investigate the reaction in detail. We arrive at the following observations: a) the in medium nucleon nucleon cross section is not significantly different from the free cross section, b) even the most central collisions have a binary character, c) most of the fragments are produced in the central collisions and d) the simulations as well as the data show a strong attractive in-plane flow resembling deep inelastic collisions e) at midrapidity the results from QMD and those from statistical model calculations agree for almost all observables with the exception of ${d^2 \sigma \over dZdE}$. This renders it difficult to extract the reaction mechanism from midrapidity fragments only. According to the simulations the reaction shows a very early formation of fragments, even in central collisions, which pass through the reaction zone without being destroyed. The final transverse momentum of the fragments is very close to the initial one and due to the Fermi motion. A heating up of the systems is not observed and hence a thermal origin of the spectra cannot be confirmed.
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"abstract": "We compare in detail central collisions Xe(50A MeV) + Sn, recently measured\nby the INDRA collaboration, with the Quantum Molecular Dynamics (QMD) model in\norder to identify the reaction mechanism which leads to multifragmentation. We\nfind that QMD describes the data quite well, in the projectile/target region as\nwell as in the midrapidity zone where also statistical models can be and have\nbeen employed. The agreement between QMD and data allows to use this dynamical\nmodel to investigate the reaction in detail. We arrive at the following\nobservations: a) the in medium nucleon nucleon cross section is not\nsignificantly different from the free cross section, b) even the most central\ncollisions have a binary character, c) most of the fragments are produced in\nthe central collisions and d) the simulations as well as the data show a strong\nattractive in-plane flow resembling deep inelastic collisions e) at midrapidity\nthe results from QMD and those from statistical model calculations agree for\nalmost all observables with the exception of ${d^2 \\sigma \\over dZdE}$. This\nrenders it difficult to extract the reaction mechanism from midrapidity\nfragments only. According to the simulations the reaction shows a very early\nformation of fragments, even in central collisions, which pass through the\nreaction zone without being destroyed. The final transverse momentum of the\nfragments is very close to the initial one and due to the Fermi motion. A\nheating up of the systems is not observed and hence a thermal origin of the\nspectra cannot be confirmed.",
"arxiv_id": "nucl-th/9810008",
"authors": [
"R. Nebauer",
"J. Aichelin",
"the INDRA collaboration"
],
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"nucl-th"
],
"doi": "10.1016/S0375-9474(99)00333-4",
"journal_ref": "Nucl.Phys. A658 (1999) 67-93",
"title": "Multifragmentation in Xe(50A MeV)+Sn Confrontation of theory and data",
"url": "https://arxiv.org/abs/nucl-th/9810008"
},
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