title: Shell Erosion and Shape Coexistence in (16)43S27.
abstract: We report on the g-factor measurement of the first isomeric state in (16)43S27 [Ex=320.5(5) keV, T1/2=415(5) ns, and g=0.317(4)]. The 7/2- spin-parity of the isomer and the intruder nature of the ground state of the nucleus are experimentally established for the first time, providing direct and unambiguous evidence of the collapse of the N=28 shell closure in neutron-rich nuclei. The shell model, beyond the mean-field and semiempirical calculations, provides a very consistent description of this nucleus showing that a well deformed prolate and quasispherical states coexist at low energy.
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: L
authors.initials: L
authors.lastname: Gaudefroy
authors.forename: J M
authors.initials: JM
authors.lastname: Daugas
authors.forename: M
authors.initials: M
authors.lastname: Hass
authors.forename: S
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authors.lastname: Grévy
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authors.initials: Ch
authors.lastname: Stodel
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authors.initials: JC
authors.lastname: Thomas
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authors.initials: L
authors.lastname: Perrot
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authors.lastname: Girod
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authors.lastname: Rossé
authors.forename: J C
authors.initials: JC
authors.lastname: Angélique
authors.forename: D L
authors.initials: DL
authors.lastname: Balabanski
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authors.lastname: Fiori
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authors.lastname: Force
authors.forename: G
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authors.lastname: Georgiev
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authors.lastname: Kameda
authors.forename: V
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authors.lastname: Kumar
authors.forename: R L
authors.initials: RL
authors.lastname: Lozeva
authors.forename: I
authors.initials: I
authors.lastname: Matea
authors.forename: V
authors.initials: V
authors.lastname: Méot
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authors.initials: P
authors.lastname: Morel
authors.forename: B S Nara
authors.initials: BS
authors.lastname: Singh
authors.forename: F
authors.initials: F
authors.lastname: Nowacki
authors.forename: G
authors.initials: G
authors.lastname: Simpson