Isospin dependence of nuclear multifragmentation in statistical model

  • The evolution of nuclear disintegration mechanisms with increasing excitation energy, from compound nucleus to multifragmentation, has been studied by using the Statistical Multifragmentation Model (SMM) within a micro-canonical ensemble. We discuss the observable characteristics as functions of excitation energy in multifragmentation, concentrating on the isospin dependence of the model in its decaying mechanism and break-up fragment configuration by comparing the A0=200, Z0=78 and A0=200, Z0=100 systems. The calculations indicate that the neutron-rich system (Z0=78) translates to a fission-like process from evaporation later than the symmetric nucleus at a lower excitation energy, but gets a larger average multiplicity as the excitation energy increases above 1.0 MeV/u.
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ZHANG Lei, XIE Dong-Zhu, ZHANG Yan-Ping and GAO Yuan. Isospin dependence of nuclear multifragmentation in statistical model[J]. Chinese Physics C, 2011, 35(6): 567-571. doi: 10.1088/1674-1137/35/6/011
ZHANG Lei, XIE Dong-Zhu, ZHANG Yan-Ping and GAO Yuan. Isospin dependence of nuclear multifragmentation in statistical model[J]. Chinese Physics C, 2011, 35(6): 567-571.  doi: 10.1088/1674-1137/35/6/011 shu
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Received: 2010-10-25
Revised: 2010-11-08
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Isospin dependence of nuclear multifragmentation in statistical model

Abstract: The evolution of nuclear disintegration mechanisms with increasing excitation energy, from compound nucleus to multifragmentation, has been studied by using the Statistical Multifragmentation Model (SMM) within a micro-canonical ensemble. We discuss the observable characteristics as functions of excitation energy in multifragmentation, concentrating on the isospin dependence of the model in its decaying mechanism and break-up fragment configuration by comparing the A0=200, Z0=78 and A0=200, Z0=100 systems. The calculations indicate that the neutron-rich system (Z0=78) translates to a fission-like process from evaporation later than the symmetric nucleus at a lower excitation energy, but gets a larger average multiplicity as the excitation energy increases above 1.0 MeV/u.

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