Fission Barriers of Compound Superheavy Nuclei
Author(s)Sheikh, J. A.; Nazarewicz, W.; Kerman, Arthur Kent; Pei, J. C.
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The dependence of fission barriers on the excitation energy of the compound nucleus impacts the survival probability of superheavy nuclei synthesized in heavy-ion fusion reactions. In this work, we investigate the isentropic fission barriers by means of the self-consistent nuclear density functional theory. The relationship between isothermal and isentropic descriptions is demonstrated. Calculations have been carried out for [superscript 264]Fm, [superscript 272]Ds, [superscript 278]112, [superscript 292]114, and [superscript 312]124. For nuclei around 278112 produced in “cold-fusion” reactions, we predict a more rapid decrease of fission barriers with excitation energy as compared to the nuclei around [superscript 292]114 synthesized in “hot-fusion” experiments. This is explained in terms of the difference between the ground-state and saddle-point temperatures. The effect of the particle gas is found to be negligible in the range of temperatures studied.
DepartmentMassachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of Physics
Physical Review Letters
American Physical Society
Pei, J. C. et al. “Fission Barriers of Compound Superheavy Nuclei.” Physical Review Letters 102.19 (2009): 192501. (C) 2010 The American Physical Society.
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