Neutron-proton pairing in the BCS approach

Details Neutron-proton pairing in the BCS approach Neutron-proton pairing in the BCS approach

1997-02-21

arxiv.org/abs/nucl-th/9702047v1

Phys.Rev.C56:1840-1843,1997

Physics

Nuclear Physics

Nuclear Theory

9 pages, RevTex, submitted to Phys. Rev. C

Scientific paper

10.1103/PhysRevC.56.1840

We investigate the BCS treatment of neutron-proton pairing involving time-reversed orbits. We conclude that an isospin-symmetric hamiltonian, treated with the help of the generalized Bogolyubov transformation, fails to describe the ground state pairing properties correctly. In order for the np isovector pairs to coexist with the like-particle pairs, one has to break the isospin symmetry of the hamiltonian by artificially increasing the strength of np pairing interaction above its isospin symmetric value. We conjecture that the np isovector pairing represents part (or most) of the congruence energy (Wigner term) in nuclear masses.

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