The nuclear incompressibility is a key parameter of the nuclear Equation of State (EoS) that can be extracted from the measurements of the so-called ``breathing mode'' of finite nuclei. The most serious discrepancy so far is between values extracted from Pb and Sn, that has provoked the longstanding question ``Why is tin so soft?". To solve this puzzle, a fully self-consistent Quasiparticle Random-Phase Approximation (QRPA) plus Quasiparticle-Vibration Coupling (QPVC) approach based on Skyrme-Hartree-Fock-Bogoliubov is developed. We show that the many-body correlations introduced by QPVC, which shift the ISGMR energy in Sn isotopes by about 0.4 MeV more than the energy in $^{208}$Pb, play a crucial role in providing a unified description of the ISGMR in Sn and Pb isotopes. The best description of the experimental strength functions is given by SV-K226 and KDE0, which are characterized by incompressibility values $K_\infty=$ 226 MeV and 229 MeV, respectively, at mean field level.

Toward a Unified Description of Isoscalar Giant Monopole Resonances in a Self-Consistent Quasiparticle-Vibration Coupling Approach / Z.Z. Li, Y.F. Niu, G. Colo'. - In: PHYSICAL REVIEW LETTERS. - ISSN 1079-7114. - 181:8(2023 Aug 23), pp. 082501.1-082501.6. [10.1103/PhysRevLett.131.082501]

Toward a Unified Description of Isoscalar Giant Monopole Resonances in a Self-Consistent Quasiparticle-Vibration Coupling Approach

G. Colo'
Ultimo
2023

Abstract

The nuclear incompressibility is a key parameter of the nuclear Equation of State (EoS) that can be extracted from the measurements of the so-called ``breathing mode'' of finite nuclei. The most serious discrepancy so far is between values extracted from Pb and Sn, that has provoked the longstanding question ``Why is tin so soft?". To solve this puzzle, a fully self-consistent Quasiparticle Random-Phase Approximation (QRPA) plus Quasiparticle-Vibration Coupling (QPVC) approach based on Skyrme-Hartree-Fock-Bogoliubov is developed. We show that the many-body correlations introduced by QPVC, which shift the ISGMR energy in Sn isotopes by about 0.4 MeV more than the energy in $^{208}$Pb, play a crucial role in providing a unified description of the ISGMR in Sn and Pb isotopes. The best description of the experimental strength functions is given by SV-K226 and KDE0, which are characterized by incompressibility values $K_\infty=$ 226 MeV and 229 MeV, respectively, at mean field level.
Settore FIS/04 - Fisica Nucleare e Subnucleare
23-ago-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1001748
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