Nuclear Orientation ofPm143

Promethium-143 has been oriented in a crystal of neodymium ethylsulfate. The angular distribution of the 740-kev $\gamma$ ray was found to be $W\left(\theta \right)=1-(0.065\mathrm{}\pm 0.006)P_2\left(cos\theta \right)$ at 0.02°K. Values for the mixing ratio, $\delta$, of the 740-kev $\gamma$ ray of ${\mathrm{Nd}}^{143}$ were obtained as a function of the magnetic moment of the ground state of ${\mathrm{Pm}}^{143}$. The spin of the excited state of ${\mathrm{Nd}}^{143}$ was assigned as $\frac{9}{2}-$. An absolute lower limit of $\left|\mu \right|>\mathrm{}1.0\mathrm{}$ was set on the magnetic moment of ${\mathrm{Pm}}^{143}$. The mixing ratio of the $\gamma$ ray of ${\mathrm{Nd}}^{143}$ was found to lie in the range $0.23<\mathrm{}\delta \left(\frac{E2\mathrm{}}{M1\mathrm{}}\right)<\mathrm{}0.35\mathrm{}$.