Isovector response and energy-weighted sums in hot nuclei

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dc.creatorKolomietz, V. M.
dc.creatorLukyanov, S. V.
dc.creatorDavidovskaya, O. I.
dc.date2008-11-03
dc.date2009-02-12
dc.date.accessioned2026-07-07T12:40:23Z
dc.date.available2026-07-07T12:40:23Z
dc.descriptionWe investigate the collective response function and the energy-weighted sums (EWS) $m_k$ for isovector mode in hot nuclei. The approach is based on the collisional kinetic theory and takes into consideration the temperature and the relaxation effects. We have evaluated the temperature dependence of the adiabatic, $E_1=\sqrt{m_1/m_{-1}}$, and scaling, $E_3=\sqrt{m_3/m_1}$, energy centroids of the isovector giant dipole resonances (IVGDR). The centroid energy $E_3$ is significantly influenced by the Fermi surface distortion effects and, in contrast to the isoscalar mode, shows much weaker variation with temperature. Taking into account a connection between the isovector sound mode and the corresponding surface vibrations we have established the $A$-dependence of the IVGDR centroid energy which is in a good agreement with experimental data. We have shown that the enhancement factor for the "model independent" sum $m_1$ is only slightly sensitive to the temperature change.
dc.description28 pages, 8 figures, revised version
dc.identifierhttps://arxiv.org/abs/0811.0301
dc.identifierhttp://arxiv.org/abs/0811.0301
dc.identifierNucl.Phys.A818:208-231,2009
dc.identifierdoi:10.1016/j.nuclphysa.2009.01.001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/219428
dc.subjectNuclear Theory
dc.titleIsovector response and energy-weighted sums in hot nuclei
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