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

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