title: Shape coexistence and the N = 28 shell closure far from stability
abstract: The masses of 31 neutron-rich nuclei in the range A = 29-47 have been measured. The precision of 19 masses has been significantly improved and 12 masses were measured for the first time. The neutron-rich Cl, S, and P isotopes are seen to exhibit a change in shell structure around N = 28. Comparison with shell model and relativistic mean field calculations demonstrate that the observed effects arise from deformed prolate ground state configurations associated with shape coexistence. Evidence for shape coexistence is provided by the observation of an isomer in 43S.
authors.affiliation: GANIL, BP 5027, F-14076 Caen Cedex 05, France.
authors.initials: F
authors.lastname: Sarazin
authors.initials: H
authors.lastname: Savajols
authors.initials: W
authors.lastname: Mittig
authors.initials: F
authors.lastname: Nowacki
authors.initials: NA
authors.lastname: Orr
authors.initials: Z
authors.lastname: Ren
authors.initials: P
authors.lastname: Roussel-Chomaz
authors.initials: G
authors.lastname: Auger
authors.initials: D
authors.lastname: Baiborodin
authors.initials: AV
authors.lastname: Belozyorov
authors.initials: C
authors.lastname: Borcea
authors.initials: E
authors.lastname: Caurier
authors.initials: Z
authors.lastname: Dlouhy
authors.initials: A
authors.lastname: Gillibert
authors.initials: AS
authors.lastname: Lalleman
authors.initials: M
authors.lastname: Lewitowicz
authors.initials: SM
authors.lastname: Lukyanov
authors.lastname: de Oliveira F
authors.initials: YE
authors.lastname: Penionzhkevich
authors.initials: D
authors.lastname: Ridikas
authors.initials: H
authors.lastname: Sakurai
authors.initials: O
authors.lastname: Tarasov
authors.lastname: de Vismes A