Microscopic analysis of T=1 and T=0 proton-neutron correlations in N=Z nuclei

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+pn:T)+B(A)−B(A+p)−B(A+n)) (B(A) being the binding energy) are good indicators of the T=1 and T=0p-n correlations. Each of them, however, originates in plural kinds of correlations with T=1 or T=0.