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The isovector and isoscalar components of neutron-proton pairing areinvestigated in the N=Z unstable nuclei of the \textit{fp}-shell through thetwo-nucleon transfer reaction (p,$^3$He) in inverse kinematics. The combinationof particle and gamma-ray detection with radioactive beams of $^{56}$Ni and$^{52}$Fe, produced by fragmentation at the GANIL/LISE facility, made itpossible to carry out this study for the first time in a closed and anopen-shell nucleus in the \textit{fp}-shell. The transfer cross-sections forground-state to ground-state (J=0$^+$,T=1) and to the first (J=1$^+$,T=0) statewere extracted for both cases together with the transfer cross-section ratios$\sigma$(0$^+$,T=1) /$\sigma$(1$^+$,T=0). They are compared with second-orderdistorted-wave born approximation (DWBA) calculations. The enhancement of theground-state to ground-state pair transfer cross-section close to mid-shell, in$^{52}$Fe, points towards a superfluid phase in the isovector channel. For the"deuteron-like" transfer, very low cross-sections to the first (J=1$^+$,T=0)state were observed both for \Ni\phe\, and \Fe\phe\, and are related to astrong hindrance of this channel due to spin-orbit effect. No evidence for anisoscalar deuteron-like condensate is observed.

Neutron-proton pairing in the N=Z radioactive fp-shell nuclei 56Ni and 52Fe probed by pair transfer