Fission of super-heavy nuclei: Fragment mass distributions and their dependence on excitation energy
The mass and total kinetic energy distributions of the fission fragments in the fission of even-even isotopes of superheavy elements from Hs (Z=108) to Og (Z=118) are estimated using a pre-scission point model. We restrict to nuclei for which spontaneous fission has been experimentally observed. The po...
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| Format: | Article |
| Language: | English |
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L.N. Gumilyov Eurasian National University
2021-11-01
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| Series: | Eurasian Journal of Physics and Functional Materials |
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| Online Access: | https://www.ephys.kz/jour/article/view/66 |
| _version_ | 1818755752957837312 |
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| author | N. .. Carjan F. A. Ivanyuk Yu. Ts. Oganessian |
| author_facet | N. .. Carjan F. A. Ivanyuk Yu. Ts. Oganessian |
| author_sort | N. .. Carjan |
| collection | DOAJ |
| description | The mass and total kinetic energy distributions of the fission fragments in the fission of even-even isotopes of superheavy elements from Hs (Z=108) to Og (Z=118) are estimated using a pre-scission point model. We restrict to nuclei for which spontaneous fission has been experimentally observed. The potential energy surfaces are calculated with Strutinsky’s shell correction procedure. The parametrization of the nuclear shapes is based on Cassini ovals. For the just before scission configuration we fix α = 0.98 , what corresponds to rneck ≈ 2 fm, and take into account another four deformation parameters: α1 , α1 , α4 , α6 . The fragment-mass distributions are estimated supposing they are due to thermal fluctuations in the mass asymmetry degree of freedom just before scission. The influence of the excitation energy of the fissioning system on these distributions is studied. The distributions of the total kinetic energy (TKE) of the fragments are also calculated (in the point-charge approximation). In Hs, Ds and Cn isotopes a transition from symmetric to asymmetric fission is predicted with increasing neutron number N (at N ≈ 168). Super-symmetric fission ocurs at N ≈ 160. When the excitation energy increases from 0 to 30 MeV, the peaks (one or two) of the mass distributions become only slightly wider. The first two moments of the TKE distributions are displayed as a function of the mass number A of the fissioning nucleus. A slow decrease of the average energy and a minimum of the width (at N ≈ 162) is found. |
| first_indexed | 2024-12-18T05:44:09Z |
| format | Article |
| id | doaj.art-ad7522a9c9294f7486c8fb493a015b7d |
| institution | Directory Open Access Journal |
| issn | 2522-9869 2616-8537 |
| language | English |
| last_indexed | 2024-12-18T05:44:09Z |
| publishDate | 2021-11-01 |
| publisher | L.N. Gumilyov Eurasian National University |
| record_format | Article |
| series | Eurasian Journal of Physics and Functional Materials |
| spelling | doaj.art-ad7522a9c9294f7486c8fb493a015b7d2022-12-21T21:19:06ZengL.N. Gumilyov Eurasian National UniversityEurasian Journal of Physics and Functional Materials2522-98692616-85372021-11-0131101710.29317/ejpfm.201903010165Fission of super-heavy nuclei: Fragment mass distributions and their dependence on excitation energyN. .. Carjan0F. A. Ivanyuk1Yu. Ts. Oganessian2Joint Institute for Nuclear ResearchInstitute for Nuclear ResearchJoint Institute for Nuclear ResearchThe mass and total kinetic energy distributions of the fission fragments in the fission of even-even isotopes of superheavy elements from Hs (Z=108) to Og (Z=118) are estimated using a pre-scission point model. We restrict to nuclei for which spontaneous fission has been experimentally observed. The potential energy surfaces are calculated with Strutinsky’s shell correction procedure. The parametrization of the nuclear shapes is based on Cassini ovals. For the just before scission configuration we fix α = 0.98 , what corresponds to rneck ≈ 2 fm, and take into account another four deformation parameters: α1 , α1 , α4 , α6 . The fragment-mass distributions are estimated supposing they are due to thermal fluctuations in the mass asymmetry degree of freedom just before scission. The influence of the excitation energy of the fissioning system on these distributions is studied. The distributions of the total kinetic energy (TKE) of the fragments are also calculated (in the point-charge approximation). In Hs, Ds and Cn isotopes a transition from symmetric to asymmetric fission is predicted with increasing neutron number N (at N ≈ 168). Super-symmetric fission ocurs at N ≈ 160. When the excitation energy increases from 0 to 30 MeV, the peaks (one or two) of the mass distributions become only slightly wider. The first two moments of the TKE distributions are displayed as a function of the mass number A of the fissioning nucleus. A slow decrease of the average energy and a minimum of the width (at N ≈ 162) is found.https://www.ephys.kz/jour/article/view/66shenuclear fissionhsdscnfllvog isotopessymmetric vs asymmetric fissionexcitation energy dependence |
| spellingShingle | N. .. Carjan F. A. Ivanyuk Yu. Ts. Oganessian Fission of super-heavy nuclei: Fragment mass distributions and their dependence on excitation energy Eurasian Journal of Physics and Functional Materials she nuclear fission hs ds cn fl lv og isotopes symmetric vs asymmetric fission excitation energy dependence |
| title | Fission of super-heavy nuclei: Fragment mass distributions and their dependence on excitation energy |
| title_full | Fission of super-heavy nuclei: Fragment mass distributions and their dependence on excitation energy |
| title_fullStr | Fission of super-heavy nuclei: Fragment mass distributions and their dependence on excitation energy |
| title_full_unstemmed | Fission of super-heavy nuclei: Fragment mass distributions and their dependence on excitation energy |
| title_short | Fission of super-heavy nuclei: Fragment mass distributions and their dependence on excitation energy |
| title_sort | fission of super heavy nuclei fragment mass distributions and their dependence on excitation energy |
| topic | she nuclear fission hs ds cn fl lv og isotopes symmetric vs asymmetric fission excitation energy dependence |
| url | https://www.ephys.kz/jour/article/view/66 |
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