Role of pairing in the description of Giant Monopole Resonances

Abstract

We compare the results obtained in the framework of the quasiparticle random phase approximation (QRPA) on top of a Hartree-Fock-Bogoliubov (HFB) with the most recent experiments on giant monopole resonances in Pb, Sn, Zr, Sm, Mo and Cd. Our calculations are fully self consistent and the density dependence of pairing interactions is, for the first time in this framework, properly taken into account. In the particle-hole (ph) channel we employ different Skyrme functionals (SLy5, SkM* and Skxs20) while in the particle-particle (pp) channel we make use of density dependent contact interactions. We introduce in the pp channel the recently proposed contact interactions which take into account the neutron-proton asymmetry. We find that no single parametrization is able to reproduce with sufficient accuracy all the nuclei. Since about two-thirds of the nuclei under investigation are better explained with a soft parametrization, this tends to suggest that the currently accepted picture for the incompressibility might require modifications.

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Cited by in corpus (18)

• The Compression-Mode Giant Resonances and Nuclear Incompressibility
• Nuclear Equation of State from ground and collective excited state properties of nuclei
• Frontiers in Nuclear Astrophysics
• Probing the incompressibility of nuclear matter at ultra-high density through the prompt collapse of asymmetric neutron star binaries
• Low-energy nuclear physics and global neutron star properties
• Deformation-induced splitting of isoscalar E0 giant resonance: Skyrme random-phase-approximation analysis
• Nuclear incompressibility and sound speed in uniform matter and finite nuclei
• Isoscalar monopole and quadrupole modes in Mo isotopes: microscopic analysis
• Indirect methods in nuclear astrophysics with relativistic radioactive beams
• Constraining nuclear matter parameters from correlation systematics:a mean-field perspective
• Correlations among symmetry energy elements in Skyrme models
• Deformation-induced splitting of the monopole giant resonance in 24Mg
• Limiting symmetry energy elements from empirical evidence
• Current Status of Nuclear Physics Research
• Deformation effects in Giant Monopole Resonance
• Pygmy resonances and symmetry energy
• Monopole Excitation and Nuclear Compressibility: Present and Future Perspectives
• Small amplitude collective modes of a finite-size unitary Fermi gas in deformed traps