Observation of quasi-γ bands in Te nuclei

Excited states of ${}^{124}$Te have been studied via ${}^{122}$Sn(${}^9$Be,α3n)${}^{124}$Te reaction at 48 MeV. The spin and parity of several states have been confirmed on the basis of results of angular correlation (R${}_{DCO}$ and linear polarization asymmetry measurements. The positive parity band structures of ${}^{124}$Te and ${}^{126}$Te have been investigated and the quasi-γ bands have been proposed in these nuclei. The structures of these bands have also been discussed under the framework of triaxial projected shell model (TPSM) calculations. The TPSM calculations fairly supported the interpretation of quasi-γ bands in ${}^{124}$Te and ${}^{126}$Te. The staggering pattern of odd-even spin states of the quasi-γ band suggests the γ-soft behaviour of ${}^{124}$Te and the typical values of staggering factors indicate the presence of the E(5)-critical point symmetry in ${}^{124}$Te. The potential energy surface calculations have also been carried out for ${}^{124}$Te and ${}^{126}$Te, which also supports the γ-soft behaviour for these nuclei.