학술논문
Neutron-proton pairing in the N=Z radioactive fp-shell nuclei 56Ni and 52Fe probed by pair transfer
Document Type
Working Paper
Author
Crom, B. Le; Assié, M.; Blumenfeld, Y.; Guillot, J.; Sagawa, H.; Suzuki, T.; Honma, M.; Achouri, N. L.; Bastin, B.; Borcea, R.; Catford, W. N.; Clement, E.; Caceres, L.; Caamano, M.; Corsi, A.; De France, G.; Delaunay, F.; De Séréville, N.; Fernandez-Dominguez, B.; Fisichella, M.; Franchoo, S.; Georgiadou, A.; Gibelin, J.; Gillibert, A.; Hammache, F.; Kamalou, O.; Knapton, A.; Lapoux, V.; Leblond, S.; Macchiavelli, A. O.; Marques, F. M.; Matta, A.; Menager, L.; Morfouace, P.; Orr, N. A.; Pancin, J.; Pereira-Lopez, X.; Perrot, L.; Piot, J.; Pollacco, E.; Ramos, D.; Roger, T.; Rotaru, F.; Sanchez-Benitez, A. M.; Sénoville, M.; Sorlin, O.; Stanoiu, M.; Stefan, I.; Stodel, C.; Suzuki, D.; Thomas, J-C; Vandebrouck, M.
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Subject
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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.
Comment: 7 pages, 4 figures
Comment: 7 pages, 4 figures