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Abstract
The EUROGAM-2 array has been used to study $\ensuremath{\gamma}$ rays emitted following the spontaneous fission of a ${}^{248}$Cm source. Analysis of Doppler-broadened lineshapes corresponding to transitions from excited rotational states in neutron-rich Sr, Zr, Mo, Ru, and Pd fission fragments has enabled measurements of state lifetimes in these nuclei at nuclear spins of $I\ensuremath{\sim}10$. Extracted transition quadrupole moments are compared with various recent theoretical approaches, as well as with measurements at lower spin, and an interpretation of the data is made within the context of prolate-oblate shape competition in this region.
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