Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2009-01-07
Phys.Rev.Lett.102:192501,2009
Physics
Nuclear Physics
Nuclear Theory
4 pages, 5 figures(revised according to referee's comments)
Scientific paper
10.1103/PhysRevLett.102.192501
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 $^{264}$Fm, $^{272}$Ds, $^{278}$112, $^{292}$114, and $^{312}$124. For nuclei around $^{278}$112 produced in "cold fusion" reactions, we predict a more rapid decrease of fission barriers with excitation energy as compared to the nuclei around $^{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.
Kerman Arthur K.
Nazarewicz Witek
Pei J. C.
Sheikh Javid A.
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