Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-02-27
Phys.Lett. B407 (1997) 103-109
Physics
Nuclear Physics
Nuclear Theory
10 RevTeX pages, 3 Postscript figures included
Scientific paper
10.1016/S0370-2693(97)00711-9
Surfaces of experimental masses of even-even and odd-odd nuclei exhibit a sharp slope discontinuity at N=Z. This cusp (Wigner energy), reflecting an additional binding in nuclei with neutrons and protons occupying the same shell model orbitals, is usually attributed to neutron-proton pairing correlations. A method is developed to extract the Wigner term from experimental data. Both empirical arguments and shell-model calculations suggest that the Wigner term can be traced back to the isospin T=0 part of nuclear interaction. Our calculations reveal the rather complex mechanism responsible for the nuclear binding around the N=Z line. In particular, we find that the Wigner term cannot be solely explained in terms of correlations between the neutron-proton J=1, T=0 (deuteron-like) pairs.
Dean David J.
Gary J.
Mizutori Shoujirou
Nazarewicz Witek
Satuła W.
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