gfactor of the 635.4 keV level inTm171

The $g$ factor of the 635.4 keV level in ${}_{}{}^{171}{}_{}{}^{}\mathrm{Tm}$, fed in the ${\beta }^{-}$ decay of 7.5 h ${}_{}{}^{171}{}_{}{}^{}\mathrm{Er}$, has been measured using perturbed angular correlation technique. The 277.4-210.5 keV $\gamma -\gamma$ cascade through this level was employed for the measurements. The mean precession angle $\omega \tau$ for this level in an external field of 10 kG was measured to be $G_2\omega \tau =0.232\mathrm{}\pm 0.031$ rad; $G_2$ was estimated to be $G_2=0.85\mathrm{}\pm 0.05$. Using the known value of the half-life for this level, $T_{\frac{1}{2}}=1.26\mathrm{}\pm 0.06$ nsec, the $g$ factor is found to be $g=+(0.62\mathrm{}\pm 0.09)$. The measured value of the $g$ factor for this level is in agreement with the earlier assignment of this state to be the $\mathrm{}\left[404\right]\mathrm{}{\frac{7}{2}}^{+}$ Nilsson state.