The high spin states of neutron-rich ${}^{106,107}\mathrm{Tc}$ nuclei have been reinvestigated by observing prompt $\gamma$ rays from the spontaneous fission of ${}^{252}\mathrm{Cf}$. In ${}^{106}\mathrm{Tc}$, a previously known collective band is expanded, and a new collective band is identified. In ${}^{107}\mathrm{Tc}$, a collective band based on the $\pi 5/2^{-}[303]$ orbital is confirmed and extended. Inconsistencies in the configuration assignments for positive parity bands in ${}^{105,107}\mathrm{Tc}$ in the previous reports are clarified. The spins and parities as well as the configurations for the two bands in ${}^{106}\mathrm{Tc}$ are assigned according to the angular momentum alignments and $g$-factor calculations. Other characteristics for the observed bands are discussed.

• Received 31 January 2009

DOI:https://doi.org/10.1103/PhysRevC.79.054317