title: Quadrupole deformation of the self-conjugate nucleus 72Kr.
abstract: We report on the first determination of the absolute B(E2;0+(1)-->2+(1)) excitation strength in the N=Z nucleus 72Kr. 72Kr is the heaviest N=Z nucleus for which this quantity has been measured and provides a benchmark in a region of the nuclear chart dominated by rapidly changing deformations and shapes mediated by the interplay of strongly oblate and prolate-driving orbitals. The deduced quadrupole deformation strength is in agreement with a variety of self-consistent models that predict an oblate shape for the ground state of 72Kr. Large-scale shell-model Monte Carlo calculations reproduce the experimental B(E2) value and link the result to the occupation of the deformation-driving g9/2 orbit.
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: A
authors.initials: A
authors.lastname: Gade
authors.forename: D
authors.initials: D
authors.lastname: Bazin
authors.forename: A
authors.initials: A
authors.lastname: Becerril
authors.forename: C M
authors.initials: CM
authors.lastname: Campbell
authors.forename: J M
authors.initials: JM
authors.lastname: Cook
authors.forename: D J
authors.initials: DJ
authors.lastname: Dean
authors.forename: D-C
authors.initials: DC
authors.lastname: Dinca
authors.forename: T
authors.initials: T
authors.lastname: Glasmacher
authors.forename: G W
authors.initials: GW
authors.lastname: Hitt
authors.forename: M E
authors.initials: ME
authors.lastname: Howard
authors.forename: W F
authors.initials: WF
authors.lastname: Mueller
authors.forename: H
authors.initials: H
authors.lastname: Olliver
authors.forename: J R
authors.initials: JR
authors.lastname: Terry
authors.forename: K
authors.initials: K
authors.lastname: Yoneda