학술논문
Neutron-proton pairing in the N=Z radioactive fp-shell nuclei 56Ni and 52Fe probed by pair transfer
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article
Author
Le Crom, B; Assié, M; Blumenfeld, Y; Guillot, J; Sagawa, H; Suzuki, T; Honma, M; Achouri, NL; Bastin, B; Borcea, R; Catford, WN; Clément, E; Cáceres, L; Caamaño, 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, AO; Marqués, FM; Matta, A; Ménager, L; Morfouace, P; Orr, NA; Pancin, J; Pereira-Lopez, X; Perrot, L; Piot, J; Pollacco, E; Ramos, D; Roger, T; Rotaru, F; Sánchez-Benítez, AM; Sénoville, M; Sorlin, O; Stanoiu, M; Stefan, I; Stodel, C; Suzuki, D; Thomas, J-C; Vandebrouck, M
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Abstract
The isovector and isoscalar components of neutron-proton pairing are investigated in the N=Z unstable nuclei of the fp-shell through the two-nucleon transfer reaction (p,3He) in inverse kinematics. The combination of particle and gamma-ray detection with radioactive beams of 56Ni and 52Fe, 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 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 σ(0+,T=1)/σ(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 52Fe, 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 56Ni(p,3He) and 52Fe(p,3He) 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.