(68)(28)Ni(40): Magicity versus superfluidity.

Authors :: Sorlin O
Leenhardt S
Donzaud C
Duprat J
Azaiez F
Nowacki F
Grawe H
Dombrádi Z
Amorini F
Astier A
Baiborodin D
Belleguic M
Borcea C
Bourgeois C
Cullen DM
Dlouhy Z
Dragulescu E
Górska M
Grévy S
Guillemaud-Mueller D
Hagemann G
Herskind B
Kiener J
Lemmon R
Lewitowicz M
Lukyanov SM
Mayet P
de Oliveira Santos F
Pantalica D
Penionzhkevich YE
Pougheon F
Poves A
Redon N
Saint-Laurent MG
Scarpaci JA
Sletten G
Stanoiu M
Tarasov O
Theisen Ch
Source :: Physical review letters [Phys Rev Lett] 2002 Mar 04; Vol. 88 (9), pp. 092501. Date of Electronic Publication: 2002 Feb 15.
Publication Year :: 2002
Abstract: The neutron-rich (66,68)Ni have been produced at GANIL via interactions of a 65.9A MeV 70Zn beam with a 58Ni target. Their reduced transition probability B(E2;0(+)(1)-->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.