Systematic Study of Fission Barriers of Excited Superheavy Nuclei

Sheikh, J. A.; Nazarewicz, Witold; Pei, J. C.

doi:10.1103/PhysRevC.80.011302

Title: Systematic Study of Fission Barriers of Excited Superheavy Nuclei

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

DOI:https://doi.org/10.1103/PhysRevC.80.011302· OSTI ID:963701

Sheikh, J. A. ^[1]; Nazarewicz, Witold ^[2]; Pei, J. C. ^[1]

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

A systematic study of fission-barrier dependence on excitation energy has been performed using the self-consistent finite-temperature Hartree-Fock+BCS (FT-HF+BCS) formalism with the SkM* Skyrme energy density functional. The calculations have been carried out for even-even superheavy nuclei with Z ranging between 110 and 124. For an accurate description of fission pathways, the effects of triaxial and reflection asymmetric degrees of freedom have been fully incorporated. Our survey demonstrates that the dependence of isentropic fission barriers on excitation energy changes rapidly with particle number, pointing to the importance of shell effects even at large excitation energies characteristic of compound nuclei. The fastest decrease of fission barriers with excitation energy is predicted for deformed nuclei around N = 164 and spherical nuclei around N = 184 that are strongly stabilized by ground-state shell effects. For nuclei ^{240}Pu and ^{256}Fm, which exhibit asymmetric spontaneous fission, our calculations predict a transition to symmetric fission at high excitation energies due to the thermal quenching of static reflection asymmetric deformations.

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

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: DE-AC05-00OR22725

OSTI ID:: 963701

Journal Information:: Physical Review C, Vol. 80, Issue 1

Country of Publication:: United States

Language:: English

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