Mixed-Spin Pairing Condensates in Heavy Nuclei

Details Mixed-Spin Pairing Condensates in Heavy Nuclei Mixed-Spin Pairing Condensates in Heavy Nuclei

2011-03-29

arxiv.org/abs/1103.5793v2

Phys.Rev.Lett.106:252502,2011

Physics

Nuclear Physics

Nuclear Theory

4+ pages, 3 figures, 1 table; 1 reference added; v2 corresponds to the published version

Scientific paper

10.1103/PhysRevLett.106.252502

We show that the Bogoliubov-de Gennes equations for nuclear ground-state wave functions support solutions in which the condensate has a mixture of spin-singlet and spin-triplet pairing. We find that such mixed-spin condensates do not occur when there are equal numbers of neutrons and protons, but only when there is an isospin imbalance. Using a phenomenological Hamiltonian, we predict that such nuclei may occur in the physical region within the proton dripline. We also solve the Bogoliubov-de Gennes equations with variable constraints on the spin-singlet and spin-triplet pairing amplitudes. For nuclei that exhibit this new pairing behavior, the resulting energy surface can be rather soft, suggesting that there may be low-lying excitations associated with the spin mixing.

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