Nuclear Orientation ofMn56

The angular distribution and circular polarization of the gamma rays emitted from 2.6-hr ${\mathrm{Mn}}^{56}$, polarized at low temperatures in cerium magnesium nitrate, have been measured. Comparing the angular distribution results with angular correlation data it is possible to establish the spins of the 2.65- and 2.98-Mev excited states of ${\mathrm{Fe}}^{56}$ as 2 uniquely. The amplitude mixing ratios $\delta \left(\frac{E2\mathrm{}}{M1\mathrm{}}\right)$ for the 1.81- and 2.13-Mev $\gamma$-rays are shown to be +0.11±0.06 and -0.27±0.03, respectively. Gamma anisotropies from aligned ${\mathrm{Mn}}^{56}$ in the same cooling salt have been studied; the results are compared with other Mn alignment experiments. From a simultaneous measurement of the angular distribution of the $\gamma$-rays from polarized ${\mathrm{Mn}}^{52}$ and ${\mathrm{Mn}}^{56}$, the ratio of the nuclear $g$-values $\left(\frac{g_{52}}{g_{56}}\right)=0.47\mathrm{}\pm 0.05$ has been determined, giving ${\mu }_{56}=3.35\mathrm{}\pm 0.35$ nm. The results of the circular polarization experiment determine ${\mu }_{56}$ to be positive.