$_{28}^{68}$Ni$_{40}$: Magicity versus superfluidity
- Sorlin, O.
- Leenhard, S.
- Donzaud, C.
- Duprat, J.
- Azaiez, F.
- Nowacki, F.
- Grawe, H.
- Dombradi, Zs.
- Amorini, F.
- Astier, A.
- Baiborodin, D.
- Belleguic, M.
- Bourgeois, C.
- Borcea, C.
- Cullen, D.M.
- Dlouhy, Z.
- Dragulescu, E.
- Gorska, M.
- Grévy, S.
- Guillemaud-Mueller, D.
- Hagemann, G.
- Herskind, B.
- Kiener, J.
- Lemmon, R.
- Lewitowicz, M.
- Lukyanov, S.M.
- Mayet, P.
- de Oliveira Santos, Francois
- Pantalica, D.
- Penionzhkevich, Yu.-E.
- Pougheon, F.
- Poves, A.
- Redon, N.
- Saint-Laurent, M.G.
- Scarpaci, J.A.
- Sletten, G.
- Stanoiu, M.
- Tarasov, O.
- Theisen, Ch.
Publication date
January 2002
DOI Publisher
American Physical Society (APS)Abstract
Matière NucléaireThe neutron-rich $^{66,68}$Ni have been produced at GANIL via interactions of a 65.9A MeV $^{70}$Zn beam with a $^{58}$Ni target. Their reduced transition probability $B(E2$;$0_1^+\rightarrow$2$^+$ has been measured for the first time by Coulomb excitation in a $^{208}$Pb target at intermediate energy. The $B(E2)$ value for $^{68}$Ni$_{40}$ is unexpectedly small. An analysis in terms of large scale shell model calculations stresses the importance of proton core excitations to reproduce the $B(E2)$ values and indicates the erosion of the $N$ = 40 harmonic-oscillator subshell by neutron-pair scattering
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