Mixed-Spin Pairing Condensates in Heavy Nuclei
Abstract
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.
Cite
@article{arxiv.1103.5793,
title = {Mixed-Spin Pairing Condensates in Heavy Nuclei},
author = {Alexandros Gezerlis and G. F. Bertsch and Y. L. Luo},
journal= {arXiv preprint arXiv:1103.5793},
year = {2011}
}
Comments
4+ pages, 3 figures, 1 table; 1 reference added; v2 corresponds to the published version