Shell effects in quasi-fission for calcium induced reactions forming thorium isotopes
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917297761812480 |
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| author | Simenel, C. Umar, A. S. Godbey, K. McGlynn, P. |
| author_facet | Simenel, C. Umar, A. S. Godbey, K. McGlynn, P. |
| contents | Quantum shell effects induce an asymmetric fission mode in actinides, which disappears in neutron deficient isotopes. Quasi-fission, characterized by a significant mass transfer in heavy ion collisions at low-energies, is expected to be affected by similar shell effects. This is studied in 40-56Ca+176Yb reactions with the time-dependent Hartree-Fock approach. All reactions exhibit a mass equilibration process that stops when a heavy fragment with Z~54 protons is formed. Unlike the fission of thorium compound nuclei, quasi-fission does not exhibit a transition to symmetric modes in neutron deficient systems. This observation is interpreted in terms of potential energy surfaces that show a persistence of an asymmetric valley with an increasing barrier preventing its population in fission of the most neutron deficient thorium isotopes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_00450 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Shell effects in quasi-fission for calcium induced reactions forming thorium isotopes Simenel, C. Umar, A. S. Godbey, K. McGlynn, P. Nuclear Theory Quantum shell effects induce an asymmetric fission mode in actinides, which disappears in neutron deficient isotopes. Quasi-fission, characterized by a significant mass transfer in heavy ion collisions at low-energies, is expected to be affected by similar shell effects. This is studied in 40-56Ca+176Yb reactions with the time-dependent Hartree-Fock approach. All reactions exhibit a mass equilibration process that stops when a heavy fragment with Z~54 protons is formed. Unlike the fission of thorium compound nuclei, quasi-fission does not exhibit a transition to symmetric modes in neutron deficient systems. This observation is interpreted in terms of potential energy surfaces that show a persistence of an asymmetric valley with an increasing barrier preventing its population in fission of the most neutron deficient thorium isotopes. |
| title | Shell effects in quasi-fission for calcium induced reactions forming thorium isotopes |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2507.00450 |