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A model combining self-consistent mean-field and shell-model techniques isused to study the competition between particle like and proton-neutron pairingcorrelations in fp-shell even-even self-conjugate nuclei. Results obtainedusing constant two-body pairing interactions as well as more sophisticatedinteractions are presented and discussed. The standard BCS calculations aresystematically compared with more refined approaches including correlationeffects beyond the independent quasi-particle approach. The competition betweenproton-neutron correlations in the isoscalar and isovector channels is alsoanalyzed, as well as their dependence on the deformation properties. Besidesthe expected role of the spin-orbit interaction and particle numberconservation, it is shown that deformation leads to a reduction of the pairingcorrelations. This reduction originates from the change of the single-particlespectrum and from a quenching of the residual pairing matrix elements. Thecompetition between isoscalar and isovector pairing in the deuteron transfer isfinally addressed. Although a strong dependence the isovector pairingcorrelations with respect to nuclear deformation is observed, they alwaysdominate over the isoscalar ones.

Deformation effects on the coexistence between neutron-proton and particle like pairing in N=Z medium mass nuclei