https://doi.org/10.1051/epjconf/202430601026
Spontaneous fission half-life in Fm isotopes with nuclear energy density functional
Center for Computational Sciences, University of Tsukuba, Tsukuba, 305-8577, Japan
* e-mail: washiyama@nucl.ph.tsukuba.ac.jp
Published online: 18 October 2024
A microscopic description of fission dynamics is important to understand the decay properties of neutron-rich heavy nuclei that are relevant to r-process nucleosynthesis. To provide a reliable and efficient method to evaluate the spontaneous fission half-life, we develop a method, called the constrained Hartree– Fock–Bogoliubov (CHFB) plus local quasiparticle random-phase approximation (LQRPA), to include dynamical residual effects in the collective inertia. With the CHFB + LQRPA, we evaluate the collective potential and the collective inertia along a mass-symmetric fission path in Fm isotopes with the neutron numbers N = 158–164. The obtained LQRPA inertia is much larger than the cranking one that ignores dynamical residual effects and shows a remarkable variation along the fission path. We estimate the fission half-life of the Fm isotopes using the action integral with the obtained collective potential and inertia. A large difference between the fission half-lives obtained with the LQRPA inertia and with the cranking inertia is observed. This indicates the importance of evaluating the collective inertia for estimating the fission half-life.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
