4,739 research outputs found
-decay half-lives at finite temperatures for N=82 isotones
Using the finite temperature quasi-particle random phase approximation
(FTQRPA) on the basis of finite temperature Skyrme-Hartree-Fock + BCS method,
we study -decay half-lives for even-even neutron magic nuclei with
N=82 in a finite temperature environment. We find that the -decay
half-life first decreases as the temperature increases for all the nuclei we
study, although the thermal effect is found to be small at temperatures
relevant to r-process nucleosynthesis. Our calculations indicate that the
half-life begins to increase at high temperatures for open shell nuclei. We
discuss this behavior in connection to the pairing phase transition.Comment: 8 pages, 16 figure
Fission barriers in neutron-proton isospin plane for heavy neutron-rich nuclei
We discuss the sensitivity of fission barrier for heavy neutron-rich nuclei
to fission paths in the two dimensional neutron-proton quadrupole plane. To
this end, we use the constrained Skyrme-Hartree-Fock + BCS method, and examine
the difference of fission barriers obtained with three constraining operators,
that is, the neutron, proton, and mass quadrupole operators. We investigate
U, U, and U, %from proton-rich to neutron-rich uranium
isotopes, that is relevant to r-process nucleosynthesis. We find that the
fission barrier heights are almost the same among the three constraining
operators even for neutron-rich nuclei, indicating that the usual way to
calculate fission barriers with the mass quadrupole operator is well justified.
We also discuss the difference between proton and neutron deformation
parameters along the fission paths.Comment: 6 pages, 7 figure
Interference Effect Between Neutron Direct and Resonance Capture Reactions For Neutron-Rich Nuclei
Interference effect of neutron capture cross section between the compound and
direct processes is investigated. The compound process is calculated by
resonance parameters and the direct process by the potential mode. The
interference effect is tested for neutron-rich Ge and Sn nuclei
relevant to -process and light nucleus C which is neutron poison in
the -process and produces long-lived radioactive nucleus C
( y). The interference effects in those nuclei are significant
around resonances, and low energy region if -wave neutron direct capture is
possible. Maxwellian averaged cross sections at and keV are also
calculated, and the interference effect changes the Maxwellian averaged capture
cross section largely depending on resonance position.Comment: 5 pages, 4 figures, poster presentation given at FUSION17 conference,
Hobart, Tasmania, Australia, Feb. 20-24, 201
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