A cranked mean-field model with two-body T=1 and T=0 pairing interactions is
presented. Approximate projection onto good particle-number is enforced via an
extended Lipkin-Nogami scheme. Our calculations suggest the simultaneous
presence of both T=0 and T=1 pairing modes in N=Z nuclei. The transitions
between different pairing phases are discussed as a function of neutron/proton
excess, Tz, and rotational frequency, ℏω. The additional binding
energy due to the T=0 np-pairing correlations, is suggested as a possible
microscopic explanation of the Wigner energy term in even-even nuclei.Comment: 8 RevTeX pages, 3 uuencoded POSTSCRIPT figures include