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Isoscalar and isovector density dependence of the pairing functional determined from global fitting

Abstract : We optimize the density dependence of a local energy density functional for pairing correlations (pair-DF), taking into account both the isoscalar and the isovector densities. All the experimental pairing gaps in even-even nuclei with N,Z>8 are analyzed by performing the Hartree-Fock-Bogoliubov calculation. The new pairing energy density functionals give the best fit for all the pairing gaps with the rms deviation of σtot=(260-360) keV, depending on adopted Skyrme interactions in the particle-hole channel. It is shown that the isoscalar-density dependence in the pair-DF can be determined almost uniquely for the several Skyrme forces by adjusting the neutron and proton pairing gaps. An empirical relation among the parameters in the isoscalar part of pair-DF is extracted. The uncertainty of the isovector part is also examined by calculating the pairing gaps of neutron-rich and proton-rich nuclei in a wider region of the nuclear chart. We point out also that the linear isovector-density dependence in the pair-DF can mimic well the Coulomb effect for pairing correlations in neutron-rich nuclei. We discuss finally the predictive power of the pair-DF for pairing properties around drip-line regions.
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Contributor : Sophie Heurteau Connect in order to contact the contributor
Submitted on : Tuesday, October 23, 2012 - 10:55:35 AM
Last modification on : Tuesday, November 30, 2021 - 8:32:04 AM




M. Yamagami, J. Margueron, H. Sagawa, K. Hagino. Isoscalar and isovector density dependence of the pairing functional determined from global fitting. Physical Review C, American Physical Society, 2012, 86, pp.034333. ⟨10.1103/PhysRevC.86.034333⟩. ⟨in2p3-00744440⟩



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