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arXiv · 2104.10708

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

B. Le Crom·M. Assié·Y. Blumenfeld·J. Guillot·H. Sagawa·T. Suzuki·M. Honma·N. L. Achouri·B. Bastin·R. Borcea·W. N. Catford·E. Clement·L. Caceres·M. Caamano·A. Corsi·G. De France·F. Delaunay·N. De Séréville·B. Fernandez-Dominguez·M. Fisichella·S. Franchoo·A. Georgiadou·J. Gibelin·A. Gillibert·F. Hammache·O. Kamalou·A. Knapton·V. Lapoux·S. Leblond·A. O. Macchiavelli·F. M. Marques·A. Matta·L. Menager·P. Morfouace·N. A. Orr·J. Pancin·X. Pereira-Lopez·L. Perrot·J. Piot·E. Pollacco·D. Ramos·T. Roger·F. Rotaru·A. M. Sanchez-Benitez·M. Sénoville·O. Sorlin·M. Stanoiu·I. Stefan·C. Stodel·D. Suzuki·J-C Thomas·M. Vandebrouck
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Abstract

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

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B. Le Crom, M. Assié, Y. Blumenfeld, J. Guillot, H. Sagawa, T. Suzuki, M. Honma, N. L. Achouri, B. Bastin, R. Borcea, W. N. Catford, E. Clement, L. Caceres, M. Caamano, A. Corsi, G. De France, F. Delaunay, N. De Séréville, B. Fernandez-Dominguez, M. Fisichella, S. Franchoo, A. Georgiadou, J. Gibelin, A. Gillibert, F. Hammache, O. Kamalou, A. Knapton, V. Lapoux, S. Leblond, A. O. Macchiavelli, F. M. Marques, A. Matta, L. Menager, P. Morfouace, N. A. Orr, J. Pancin, X. Pereira-Lopez, L. Perrot, J. Piot, E. Pollacco, D. Ramos, T. Roger, F. Rotaru, A. M. Sanchez-Benitez, M. Sénoville, O. Sorlin, M. Stanoiu, I. Stefan, C. Stodel, D. Suzuki, J-C Thomas, M. Vandebrouck. 2021-04-21. Neutron-proton pairing in the N=Z radioactive fp-shell nuclei 56Ni and 52Fe probed by pair transfer. https://doi.org/10.1016/j.physletb.2022.137057

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