Is there neutron-proton pairing in medium heavy nuclei?

Vogel, P.; Jonson, B.; Hansen, P.G.

doi:10.1016/0370-2693(84)91068-2

Is there neutron-proton pairing in medium heavy nuclei?

1984

4 pages

Published in:

Phys.Lett.B 139 (1984) 227-230

Published: 1984

DOI:

10.1016/0370-2693(84)91068-2

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Abstract: (Elsevier)

Present knowledge of the proton and neutron pairing energies Δ p and Δ n , deduced from nuclear masses, is reviewed and an attempt is made to find general trends in the data. The analysis shows that, besides the well-known smooth slow decrease with A , the pairing energies also contain a symmetry energy-like dependence on the neutron excess (N−Z) A . The trends is most pronounced in the shell 50< Z <82, 82< N <126 where both pairing energies decrease by a factor of almost two between the most neutron deficient and the most neutron rich nuclei. The same tendency persists in other mass regions, but is not a universal one. An empirical expression for Δ, that is more accurate than the value 12A − 1 2 MeV usually assumed, is proposed.

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[1]

in: Proc. 4th Intern. Conf. on Nuclei far from stability (Helsingør, Denmark), CERN-81-09, p. 190