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RESEARCH PRODUCT
Giant Monopole Resonances and nuclear incompressibilities studied for the zero-range and separable pairing interactions
Nicolas MichelJacek DobaczewskiJacek DobaczewskiAlessandro PastoreP. VeselýB. G. CarlssonJ. Toivanensubject
PhysicsNuclear and High Energy Physicsta114Nuclear Theory[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]010308 nuclear & particles physicsMagnetic monopolechemistry.chemical_elementFOS: Physical sciencesNuclear matter01 natural sciencesSeparable spaceNuclear Theory (nucl-th)chemistryPairingQuantum mechanics0103 physical sciencesIsotopes of tinPhysical SciencesQuasiparticle010306 general physicsRandom phase approximationTindescription
Background: Following the 2007 precise measurements of monopole strengths in tin isotopes, there has been a continuous theoretical effort to obtain a precise description of the experimental results. Up to now, there is no satisfactory explanation of why the tin nuclei appear to be significantly softer than 208Pb. Purpose: We determine the influence of finite-range and separable pairing interactions on monopole strength functions in semi-magic nuclei. Methods: We employ self-consistently the Quasiparticle Random Phase Approximation on top of spherical Hartree-Fock-Bogolyubov solutions. We use the Arnoldi method to solve the linear-response problem with pairing. Results: We found that the difference between centroids of Giant Monopole Resonances measured in lead and tin (about 1 MeV) always turns out to be overestimated by about 100%. We also found that the volume incompressibility, obtained by adjusting the liquid-drop expression to microscopic results, is significantly larger than the infinite-matter incompressibility. Conclusions: The zero-range and separable pairing forces cannot induce modifications of monopole strength functions in tin to match experimental data.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-01-01 |