High-spin structures in the neutron-rich ${}^{108}\mathrm{Tc}$ nucleus have been reinvestigated by measuring the prompt $\gamma$-rays from spontaneous fission of ${}^{252}\mathrm{Cf}$. A previously known collective band has been extended up to higher spin states and a new side band has been identified. These doublet bands are proposed as pseudospin partner bands with configurations $\pi 1/2^{+}[431]\otimes \nu [\widetilde{312}\hspace{0.5em}5/2^{+},3/2^{+}]$, which is a first identification in $A~100$ region. The particle-rotor model (PRM) was applied to calculate levels and $B(M1)/B(E2)$ ratios of the bands in ${}^{108}\mathrm{Tc}$. The calculated results are in good agreement with the experimental values.

• Received 31 July 2008

DOI:https://doi.org/10.1103/PhysRevC.78.064301