Effects of dynamic deformation of Fermi surface on giant resonances in nuclei
The nature of dynamic changes in the momentum-space distribution of nucleons (dynamic deformation of the Fermi surface) associated with monopole and quadrupole giant resonances in spherical nuclei has been studied. Within the kinetic model for collective excitations in nuclei, the momentum flux tens...
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Institute for Nuclear Research, National Academy of Sciences of Ukraine
2025-06-01
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| Series: | Ядерна фізика та енергетика |
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| Online Access: | https://jnpae.kinr.kyiv.ua/26.2/Articles_PDF/jnpae-2025-26-0099-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 nature of dynamic changes in the momentum-space distribution of nucleons (dynamic deformation of the Fermi surface) associated with monopole and quadrupole giant resonances in spherical nuclei has been studied. Within the kinetic model for collective excitations in nuclei, the momentum flux tensor associated with these resonances has been considered, which contains information about dynamic changes of the Fermi surface during a collective excitation in the nucleus. It was found that the ratio of the normal component of the momentum flux tensor to the variation of the nucleon density, associated with monopole resonance, has a hydrodynamic character inside the nucleus: it is approximately equal to the compressibility coefficient of the nuclear Fermi liquid. While this relation has a different character for quadrupole resonance: its local values differ significantly from the compressibility coefficient. It is found that the off-diagonal component of the momentum flux tensor for the monopole resonance is zero, while the off-diagonal component of the momentum flux tensor associated with the quadrupole resonance has a significant magnitude, which explicitly reveals the influence of the dynamic deformation of the Fermi surface on the formation of this resonance. |
| format | Article |
| id | doaj-art-6e5871ad41f84de69fb30668ffc532a0 |
| institution | DOAJ |
| issn | 1818-331X 2074-0565 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Institute for Nuclear Research, National Academy of Sciences of Ukraine |
| record_format | Article |
| series | Ядерна фізика та енергетика |
| spelling | doaj-art-6e5871ad41f84de69fb30668ffc532a02025-08-20T03:17:54ZengInstitute for Nuclear Research, National Academy of Sciences of UkraineЯдерна фізика та енергетика1818-331X2074-05652025-06-0126299104https://doi.org/10.15407/jnpae2025.02.099Effects of dynamic deformation of Fermi surface on giant resonances in nucleiV. 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 nature of dynamic changes in the momentum-space distribution of nucleons (dynamic deformation of the Fermi surface) associated with monopole and quadrupole giant resonances in spherical nuclei has been studied. Within the kinetic model for collective excitations in nuclei, the momentum flux tensor associated with these resonances has been considered, which contains information about dynamic changes of the Fermi surface during a collective excitation in the nucleus. It was found that the ratio of the normal component of the momentum flux tensor to the variation of the nucleon density, associated with monopole resonance, has a hydrodynamic character inside the nucleus: it is approximately equal to the compressibility coefficient of the nuclear Fermi liquid. While this relation has a different character for quadrupole resonance: its local values differ significantly from the compressibility coefficient. It is found that the off-diagonal component of the momentum flux tensor for the monopole resonance is zero, while the off-diagonal component of the momentum flux tensor associated with the quadrupole resonance has a significant magnitude, which explicitly reveals the influence of the dynamic deformation of the Fermi surface on the formation of this resonance.https://jnpae.kinr.kyiv.ua/26.2/Articles_PDF/jnpae-2025-26-0099-Abrosimov.pdfdeformation of fermi surfacekinetic modelfree moving surfacemomentum flux tensorgiant resonances. |
| spellingShingle | V. I. Abrosimov O. I. Davydovska Effects of dynamic deformation of Fermi surface on giant resonances in nuclei Ядерна фізика та енергетика deformation of fermi surface kinetic model free moving surface momentum flux tensor giant resonances. |
| title | Effects of dynamic deformation of Fermi surface on giant resonances in nuclei |
| title_full | Effects of dynamic deformation of Fermi surface on giant resonances in nuclei |
| title_fullStr | Effects of dynamic deformation of Fermi surface on giant resonances in nuclei |
| title_full_unstemmed | Effects of dynamic deformation of Fermi surface on giant resonances in nuclei |
| title_short | Effects of dynamic deformation of Fermi surface on giant resonances in nuclei |
| title_sort | effects of dynamic deformation of fermi surface on giant resonances in nuclei |
| topic | deformation of fermi surface kinetic model free moving surface momentum flux tensor giant resonances. |
| url | https://jnpae.kinr.kyiv.ua/26.2/Articles_PDF/jnpae-2025-26-0099-Abrosimov.pdf |
| work_keys_str_mv | AT viabrosimov effectsofdynamicdeformationoffermisurfaceongiantresonancesinnuclei AT oidavydovska effectsofdynamicdeformationoffermisurfaceongiantresonancesinnuclei |