Isoscalar dipole response of heavy nuclei in low-energy region within kinetic model
The isoscalar dipole response of heavy spherical nuclei in the low-energy region is studied by using a semiclassical model, based on the solution of the linearized Vlasov kinetic equation for finite Fermi systems. In this translation-invariant model, the excitations of the center of mass motion are...
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Institute for Nuclear Research, National Academy of Sciences of Ukraine
2020-06-01
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| Series: | Ядерна фізика та енергетика |
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| Online Access: | http://jnpae.kinr.kiev.ua/21.2/Articles_PDF/jnpae-2020-21-0129-Abrosimov.pdf |
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| author | V. I. Abrosimov O. I. Davydovska |
| author_facet | V. I. Abrosimov O. I. Davydovska |
| author_sort | V. I. Abrosimov |
| collection | DOAJ |
| description | The isoscalar dipole response of heavy spherical nuclei in the low-energy region is studied by using a semiclassical model, based on the solution of the linearized Vlasov kinetic equation for finite Fermi systems. In this translation-invariant model, the excitations of the center of mass motion are exactly separated from the internal ones. The isoscalar dipole strength function displays three resonance structures in the energy region up to 15 MeV. Calculations of the velocity fields associated with resonance structures at centroid energies show the vortex (toroidal) nature of two overlying resonances. The main toroidal resonance gives a qualitative description of the low-energy isoscalar dipole resonance, which is observed in heavy spherical nuclei. The origin of the lowest isoscalar dipole resonance structure is apparently related to dipole single-particle excitations. Its centroid energy is close to the minimum energy of the dipole single-particle spectrum, and taking into account the residual interaction leads only to an insignificant shift of the centroid energy towards lower energy. However, the inclusion of residual interaction noticeably enhances the velocity field associated with the lowest resonance, which indicates collective effects in this resonance structure. |
| format | Article |
| id | doaj-art-d8beb43234534a8e93922fb911fedfb6 |
| institution | OA Journals |
| issn | 1818-331X 2074-0565 |
| language | English |
| publishDate | 2020-06-01 |
| publisher | Institute for Nuclear Research, National Academy of Sciences of Ukraine |
| record_format | Article |
| series | Ядерна фізика та енергетика |
| spelling | doaj-art-d8beb43234534a8e93922fb911fedfb62025-08-20T02:04:15ZengInstitute for Nuclear Research, National Academy of Sciences of UkraineЯдерна фізика та енергетика1818-331X2074-05652020-06-01212129136https://doi.org/10.15407/jnpae2020.02.129Isoscalar dipole response of heavy nuclei in low-energy region within kinetic modelV. I. Abrosimov0O. I. Davydovska1Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, UkraineInstitute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, UkraineThe isoscalar dipole response of heavy spherical nuclei in the low-energy region is studied by using a semiclassical model, based on the solution of the linearized Vlasov kinetic equation for finite Fermi systems. In this translation-invariant model, the excitations of the center of mass motion are exactly separated from the internal ones. The isoscalar dipole strength function displays three resonance structures in the energy region up to 15 MeV. Calculations of the velocity fields associated with resonance structures at centroid energies show the vortex (toroidal) nature of two overlying resonances. The main toroidal resonance gives a qualitative description of the low-energy isoscalar dipole resonance, which is observed in heavy spherical nuclei. The origin of the lowest isoscalar dipole resonance structure is apparently related to dipole single-particle excitations. Its centroid energy is close to the minimum energy of the dipole single-particle spectrum, and taking into account the residual interaction leads only to an insignificant shift of the centroid energy towards lower energy. However, the inclusion of residual interaction noticeably enhances the velocity field associated with the lowest resonance, which indicates collective effects in this resonance structure.http://jnpae.kinr.kiev.ua/21.2/Articles_PDF/jnpae-2020-21-0129-Abrosimov.pdfkinetic modellow-energy resonance structuresvelocity fieldtoroidal resonances. |
| spellingShingle | V. I. Abrosimov O. I. Davydovska Isoscalar dipole response of heavy nuclei in low-energy region within kinetic model Ядерна фізика та енергетика kinetic model low-energy resonance structures velocity field toroidal resonances. |
| title | Isoscalar dipole response of heavy nuclei in low-energy region within kinetic model |
| title_full | Isoscalar dipole response of heavy nuclei in low-energy region within kinetic model |
| title_fullStr | Isoscalar dipole response of heavy nuclei in low-energy region within kinetic model |
| title_full_unstemmed | Isoscalar dipole response of heavy nuclei in low-energy region within kinetic model |
| title_short | Isoscalar dipole response of heavy nuclei in low-energy region within kinetic model |
| title_sort | isoscalar dipole response of heavy nuclei in low energy region within kinetic model |
| topic | kinetic model low-energy resonance structures velocity field toroidal resonances. |
| url | http://jnpae.kinr.kiev.ua/21.2/Articles_PDF/jnpae-2020-21-0129-Abrosimov.pdf |
| work_keys_str_mv | AT viabrosimov isoscalardipoleresponseofheavynucleiinlowenergyregionwithinkineticmodel AT oidavydovska isoscalardipoleresponseofheavynucleiinlowenergyregionwithinkineticmodel |