title: New shape isomer in the self-conjugate nucleus 72Kr.
abstract: A new isomeric 0(+) state was identified as the first excited state in the self-conjugate (N=Z) nucleus 72Kr. By combining for the first time conversion-electron and gamma-ray spectroscopy with the production of metastable states in high-energy fragmentation, the electric-monopole decay of the new isomer to the ground state was established. The new 0(+) state is understood as the band head of the known prolate rotational structure, which strongly supports the interpretation that 72Kr is one of the rare nuclei having an oblate-deformed ground state. This observation gives in fact the first evidence for a shape isomer in a N=Z nucleus.
authors.affiliation: CEA Saclay, DAPNIA/SPhN, F-91191 Gif-sur-Yvette, France.
authors.forename: E
authors.initials: E
authors.lastname: Bouchez
authors.forename: I
authors.initials: I
authors.lastname: Matea
authors.forename: W
authors.initials: W
authors.lastname: Korten
authors.forename: F
authors.initials: F
authors.lastname: Becker
authors.forename: B
authors.initials: B
authors.lastname: Blank
authors.forename: C
authors.initials: C
authors.lastname: Borcea
authors.forename: A
authors.initials: A
authors.lastname: Buta
authors.forename: A
authors.initials: A
authors.lastname: Emsallem
authors.forename: G
authors.initials: G
authors.lastname: de France
authors.forename: J
authors.initials: J
authors.lastname: Genevey
authors.forename: F
authors.initials: F
authors.lastname: Hannachi
authors.forename: K
authors.initials: K
authors.lastname: Hauschild
authors.forename: A
authors.initials: A
authors.lastname: Hürstel
authors.forename: Y
authors.initials: Y
authors.lastname: Le Coz
authors.forename: M
authors.initials: M
authors.lastname: Lewitowicz
authors.forename: R
authors.initials: R
authors.lastname: Lucas
authors.forename: F
authors.initials: F
authors.lastname: Negoita
authors.forename: F
authors.initials: F
authors.lastname: de Oliveira Santos
authors.forename: D
authors.initials: D
authors.lastname: Pantelica
authors.forename: J
authors.initials: J
authors.lastname: Pinston
authors.forename: P
authors.initials: P
authors.lastname: Rahkila
authors.forename: M
authors.initials: M
authors.lastname: Rejmund
authors.forename: M
authors.initials: M
authors.lastname: Stanoiu
authors.forename: Ch
authors.initials: Ch
authors.lastname: Theisen