Fission Barriers of Compound Superheavy Nuclei

Pei, Junchen; Nazarewicz, Witold; Sheikh, J. A.; Kerman, A. K.

doi:10.1103/PhysRevLett.102.192501

Fission Barriers of Compound Superheavy Nuclei

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.102.192501· OSTI ID:963691

Pei, Junchen ^[1]; Nazarewicz, Witold ^[1]; Sheikh, J. A. ^[2]; Kerman, A. K. ^[2]

ORNL
University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)

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. We study the temperature-dependent fission barriers by means of the self-consistent nuclear density functional theory. The equivalence of isothermal and isentropic descriptions is demonstrated. The effect of the particle gas is found to be negligible in the range of temperatures studied. 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 temperature 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 fission-barrier temperatures. Our calculations are consistent with the long survival probabilities of the superheavy elements produced in Dubna with the ^{48}Ca beam.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Laboratory (ORNL); Holifield Radioactive Ion Beam Facility

Sponsoring Organization:: DOE Office of Science; SC USDOE - Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 963691

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 102; ISSN 0031-9007; ISSN PRLTAO

Country of Publication:: United States

Language:: English

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