Abstract
New results obtained in this work from measurements of $\ensuremath{\gamma}$ radiation following fission of $^{248}\mathrm{Cm}$ and $^{252}\mathrm{Cf}$, performed using Eurogam2 and Gammasphere arrays, respectively, reveal excitations corresponding to $\ensuremath{\gamma}$ vibrations and triaxial deformation present in $^{100}\mathrm{Zr}$ and $^{102}\mathrm{Zr}$ nuclei. This is the first observation of nonaxial bands in Zr isotopes. Such excitations probably occur due to competing prolate and oblate configurations, identified recently in these nuclei. Evolution of $\ensuremath{\gamma}$ softness and triaxiality in Zr isotopes is observed in the function of the neutron number.
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