Nuclear Transitions inCs133

Abstract

The characteristics of three nuclear transitions in ${\mathrm{Cs}}^{133}$ have been studied. Observations have been made upon the conversion electrons and/or unconverted quanta emitted in the transitions at 81, 220, and 54 keV. The results may be summarized as follows: (1) The 81-keV ($M1+E2\mathrm{}$, $d_{\frac{5}{2}}\to g_{\frac{7}{2}}$) transition has a measured $\frac{K}{\mathrm{}(L+M)\mathrm{}}$ ratio of 4.79±0.09. The experimentally determined $K$-shell conversion coefficient, ${\alpha }_K$ is 1.35±0.05. For this delayed transition, ${{\beta }_1}^K\left(\lambda \right)$ is calculated to be 1.33±0.05, and $\lambda$ to be 5±3. (2) The $\frac{K}{\mathrm{}(L+M)\mathrm{}}$ ratio of the 220-keV gamma ray has been measured in a semiconducting detector to be 7.4±0.07. (3) The unconverted quanta of the 54-keV transition have been shown to be emitted in only (0.107±0.041)% of the disintegrations. The properties of ${\mathrm{Cs}}^{133}$ seem not to be fully explained by the single-particle model.