Medium polarization effects in 3SD1 spin-triplet pairing

Abstract

Stimulated by the still puzzling competition between spin-singlet and spin-triplet pairing in nuclei, the 3SD1 neutron-proton pairing is investigated in the framework of BCS theory of nuclear matter. The medium polarization effects are included in the single particle spectrum and also in the pairing interaction starting from the G-matrix, calculated in the Brueckner-Hartree-Fock approximation. The vertex corrections due to spin and isospin collective excitations of the medium are determined from the Bethe-Salpeter equation in the RPA limit, taking into account the tensor correlations. It is found that the self-energy corrections confine the superfluid state to very low-density, while remarkably quenching the magnitude of the energy gap, while the induced interaction has an attractive effect. The interplay between spin-singlet and spin-triplet pairing is discussed in nuclear matter as well as in finite nuclei.

arXiv comment9 pages, 4 figures, 34 conferences

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• Nuclear superfluidity at finite temperature
• Neutron-proton pairing in Nuclear Matter
• Investigation of the pairing effect in 10B nucleus compared with 10Be and 10C nuclei by using the extended THSR wave function
• Polaronic Proton and Diproton Clustering in Neutron-Rich Matter
• Mean-Field Theory for Fermion Pairs and the ab initio Particle-Vibration-Coupling Approach
• Vector-boson condensates, spin-triplet superfluidity of paired neutral and charged fermions, and $3P_2$ pairing of nucleons
• Variational and parquet-diagram calculations for neutron matter. III. S-wave pairing
• Pairing properties of semilocal coordinate&momentum-space regularized chiral interactions
• Coexistence of isospin I = 0 and I = 1 pairings in asymmetric nuclear matter