Weakly deformed oblate structures in ${}_{76}^{198}$${\mathrm{Os}}_{122}$

Rapid Communication

Weakly deformed oblate structures in $_{76}^{198}$ ${Os}_{122}$

Zs. Podolyák et al.

Phys. Rev. C 79, 031305(R) – Published 16 March 2009

Abstract

Gamma rays de-exciting isomeric states in the neutron-rich nucleus $_{76}^{198}$ ${Os}_{122}$ have been observed following relativistic projectile fragmentation of a 1 GeV per nucleon ${}^{208}{Pb}$ beam. The ground-state band has properties compatible with oblate deformation. The evolution of the structure of Os isotopes characterized by sudden prolate-oblate shape change is discussed and contrasted with the smooth change known in the Pt chain.