The mean-lifetimes, τ, of various medium-spin excited states in ${}^{103}\mathrm{Pd}$ and ${}^{106,107}\mathrm{Cd}$ have been deduced using the Recoil Distance Doppler Shift technique and the Differential Decay Curve Method. In ${}^{106}\mathrm{Cd}$, the mean-lifetimes of the $I^{\pi }={12}^{+}$ state at $E_x=5418$ keV and the $I^{\pi }={11}^{-}$ state at $E_x=4324$ keV have been deduced as 11.4(17)ps and 8.2(7)ps, respectively. The associated ${\beta }_2$ deformation within the axially-symmetric deformed rotor model for these states are 0.14(1) and 0.14(1), respectively. The ${\beta }_2$ deformation of 0.14(1) for the $I^{\pi }={12}^{+}$ state in ${}^{106}\mathrm{Cd}$ compares with a predicted ${\beta }_2$ value from total Routhian surface (TRS) calculations of 0.17. In addition, the mean-lifetimes of the yrast $I^{\pi }={\frac{15}{2}}^{-}$ states in ${}^{103}\mathrm{Pd}$ (at $E_x=1262$ keV) and ${}^{107}\mathrm{Cd}$ (at $E_x=1360$ keV) have been deduced to be 31.2(44)ps and 31.4(17)ps, respectively, corresponding to ${\beta }_2$ values of 0.16(1) and 0.12(1) assuming axial symmetry. Agreement with TRS calculations are good for ${}^{103}\mathrm{Pd}$ but deviate for that predicted for ${}^{107}\mathrm{Cd}$.

• Received 4 September 2007

DOI:https://doi.org/10.1103/PhysRevC.76.064302