Spontaneous fission half-life in Fm isotopes with nuclear energy density functional
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 constra...
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EDP Sciences
2024-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2024/16/epjconf_fusion2024_01026.pdf |
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| author | Washiyama Kouhei |
| author_facet | Washiyama Kouhei |
| author_sort | Washiyama Kouhei |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-58fc9fce4d224460aa30bd3fccf9b68f |
| institution | OA Journals |
| issn | 2100-014X |
| language | English |
| publishDate | 2024-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj-art-58fc9fce4d224460aa30bd3fccf9b68f2025-08-20T02:10:42ZengEDP SciencesEPJ Web of Conferences2100-014X2024-01-013060102610.1051/epjconf/202430601026epjconf_fusion2024_01026Spontaneous fission half-life in Fm isotopes with nuclear energy density functionalWashiyama Kouhei0Center for Computational Sciences, University of TsukubaA 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.https://www.epj-conferences.org/articles/epjconf/pdf/2024/16/epjconf_fusion2024_01026.pdf |
| spellingShingle | Washiyama Kouhei Spontaneous fission half-life in Fm isotopes with nuclear energy density functional EPJ Web of Conferences |
| title | Spontaneous fission half-life in Fm isotopes with nuclear energy density functional |
| title_full | Spontaneous fission half-life in Fm isotopes with nuclear energy density functional |
| title_fullStr | Spontaneous fission half-life in Fm isotopes with nuclear energy density functional |
| title_full_unstemmed | Spontaneous fission half-life in Fm isotopes with nuclear energy density functional |
| title_short | Spontaneous fission half-life in Fm isotopes with nuclear energy density functional |
| title_sort | spontaneous fission half life in fm isotopes with nuclear energy density functional |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2024/16/epjconf_fusion2024_01026.pdf |
| work_keys_str_mv | AT washiyamakouhei spontaneousfissionhalflifeinfmisotopeswithnuclearenergydensityfunctional |