Magnetic Moment ofSm145and Attenuation Following the Decay of OrientedSm145

Samarium-145 nuclei were oriented at low temperatures in neodymium ethylsulfate (NES) and cerium magnesium nitrate (CMN) lattices. From the temperature-dependent angular distribution of the 61-keV $\gamma$ ray in ${\mathrm{Pm}}^{145}$, a magnetic moment $\mu =0.92\mathrm{}\pm 0.06{\mu }_N$ was deduced for the ground state of ${\mathrm{Sm}}^{145}$. The ratio of attenuation coefficients in the 61-keV state of ${\mathrm{Pm}}^{145}$ in the two lattices was found to be $\frac{G_2\left(\mathrm{CMN}\right)}{G_2\left(\mathrm{NES}\right)}=+0.44\mathrm{}\left(10\right)\mathrm{}$. Evidence is presented which indicates that temperature gradients in CMN can lead to erroneously low values for magnetic moments.