Hindered $\Delta K=1$ Dipole Strength in octupole bands in $N=90$ ${}^{154}$Gd from Lifetime Measurements with $\gamma -\gamma$ fast timing technique

A. Pal, S. Basak, D. Kumar +7

The lifetimes of the low-lying negative-parity $1^{-}$ state at 1414~keV and $2^{-}$ state at 1398~keV in ${}^{154}$Gd have been measured using the $\gamma$--$\gamma$ fast-timing technique with th…