Probing mixed-spin pairing in heavy nuclei

Abstract

The nature of the nuclear pairing condensate is an active topic of investigation, especially as regards its neutron-proton versus identical-particle character, which manifests as the difference between spin-singlet and spin-triplet pairing. In this work, we probe the recently proposed mixed-spin pairing condensates, using a phenomenological Hamiltonian and Hartree-Fock-Bogoliubov theory along with the gradient method. In addition to improving the solution of the many-body problem, we have calculated a series of physical quantities and examined the robustness of the mixed-spin pairing state as the input Hamiltonian is modified. Overall, we find that even though the mixed-spin correlation energy is suppressed in comparison to earlier work, the new pairing behavior persists. We also discuss the possibility of directly probing the mixed-spin pairing phase.

10 pages, 7 figures, 2 tables; v2 corresponds to the published version

References in corpus (9)

• Momentum sharing in imbalanced Fermi systems
• Overview of Neutron-Proton Pairing
• Neutron Matter from Low to High Density
• Mixed-Spin Pairing Condensates in Heavy Nuclei
• Application of the gradient method to Hartree-Fock-Bogoliubov theory
• Isoscalar and isovector pairing in a formalism of quartets
• Proton-neutron pairing vibrations in N=Z nuclei: Precursory soft mode of isoscalar pairing condensation
• Deformation effects on the coexistence between neutron-proton and particle like pairing in N=Z medium mass nuclei
• Proton and neutron correlations in ${}^{10}$B

Cited by in corpus (6)

• The BCS-BEC crossover: From ultra-cold Fermi gases to nuclear systems
• Properties of isocalar-pair condensates
• Symmetry Restoration in Mixed-Spin Paired Heavy Nuclei
• Spin-Triplet Pairing in Heavy Nuclei is Stable Against Deformation
• Competition of deformation and neutron-proton pairing in Gamow-Teller transitions for ${}^{56,58}$Ni and ${}^{62,64}$Ni
• Cold atoms beyond atomic physics