title: Evidence for collective oblate rotation in N = Z 68Se
abstract: A gamma-ray spectroscopic measurement of the N = Z nucleus 68Se has been made following the 12C(58Ni,2n) reaction at 185 and 220 MeV using Gammasphere and the Argonne Fragment Mass Analyzer. Despite a very low production cross section of 200(50) &mgr;b, two distinct rotational bands were found; the ground state band consistent with oblate collective rotation, and an excited band consistent with prolate rotation. These observations support long-standing predictions that nuclear ground states with substantial oblate (beta(2) approximately -0.3) deformation should exist in this region.
authors.affiliation: Department of Physics, DePaul University, Chicago, Illinois 60614, USA.
authors.initials: SM
authors.lastname: Fischer
authors.initials: DP
authors.lastname: Balamuth
authors.initials: PA
authors.lastname: Hausladen
authors.initials: CJ
authors.lastname: Lister
authors.initials: MP
authors.lastname: Carpenter
authors.initials: D
authors.lastname: Seweryniak
authors.initials: J
authors.lastname: Schwartz