Wigner energy and nuclear mass relations

In this paper we construct an approach to extract the Wigner energy [B-w(N,Z) = -W(A)vertical bar N - Z vertical bar - d(A)delta(N),(Z)pi(np)] by using local mass relations, in the first-order approximation. We obtain W(A) = (42.7 +/- 1.2)/A MeV, d(A) = (28.7 +/- 1.5)/A MeV. By using the Wigner energies such obtained as well as empirical pairing and symmetry energies, the resultant binding-energy difference between the lowest T = 0 and T = 1 states of odd-odd N = Z nuclei is in good agreement with experimental data.