The lifetimes of the first excited states of the N=30 isotones 50Ca and 51Sc have been determined using the Recoil Distance Doppler Shift method in combination with the CLARA-PRISMA spectrometers. This is the first time such a method is applied to measure lifetimes of neutron-rich nuclei populated via a multinucleon transfer reaction. This extends the lifetime knowledge beyond the f7/2 shell closure and allows us to derive the effective proton and neutron charges in the fp shell near the doubly magic nucleus 48Ca, using large-scale, shell-model calculations. These results indicate an orbital dependence of the core polarization along the fp shell.
Lifetime measurements of the neutron-rich N=30 isotones 50Ca and 51Sc : orbital dependence of effective charges in the fp shell / J.J. Valiente-Dobòn, D. Mengoni, A. Gadea, E. Farnea, S.M. Lenzi, S. Lunardi, A. Dewald, Th. Pissulla, S. Szilner, R. Broda, F. Recchia, A. Algora, L. Angus, D. Bazzacco, G. Benzoni, P.G. Bizzeti, A.M. Bizzeti-Sona, P. Boutachkov, L. Corradi, F.C.L. Crespi, G. de Angelis, E. Fioretto, A . Gorgen, M. Gorska,A. Gottardo, E. Grodner, B. Guiot,A. Howard,W. Krolas, S. Leoni, P. Mason, R. Menegazzo, D. Montanari,G. Montagnoli, D.R. Napoli, A. Obertelli, T. Pawlat, B. Rubio, E. Sahin, F. Scarlassara, R. Silvestri, A.M. Stefanini, J.F. Smith, D. Steppenbeck, C.A. Ur, P.T. Wady, J. Wrzesinski, E. Maglione, I. Hamamoto. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 102:24(2009), pp. 242502.242502.1-242502.242502.5.
Lifetime measurements of the neutron-rich N=30 isotones 50Ca and 51Sc : orbital dependence of effective charges in the fp shell
F.C.L. Crespi;S. Leoni;D. Montanari;
2009
Abstract
The lifetimes of the first excited states of the N=30 isotones 50Ca and 51Sc have been determined using the Recoil Distance Doppler Shift method in combination with the CLARA-PRISMA spectrometers. This is the first time such a method is applied to measure lifetimes of neutron-rich nuclei populated via a multinucleon transfer reaction. This extends the lifetime knowledge beyond the f7/2 shell closure and allows us to derive the effective proton and neutron charges in the fp shell near the doubly magic nucleus 48Ca, using large-scale, shell-model calculations. These results indicate an orbital dependence of the core polarization along the fp shell.
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