Abstract
The competition between the isovector ( T = 1 ) and isoscalar ( T = 0 ) proton–neutron ( p – n ) correlations in N = Z nuclei is investigated by calculating their correlation energies with a realistic effective interaction which reproduces observed nuclear properties very well, in a strict shell model treatment. It is shown in the realistic shell model that the double-differences of binding energies ( B ( A + p n : T ) + B ( A ) − B ( A + p ) − B ( A + n ) ) ( B ( A ) being the binding energy) are good indicators of the T = 1 and T = 0 p – n correlations. Each of them, however, originates in plural kinds of correlations with T = 1 or T = 0 .
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