K(L+M)Internal Conversion Ratios forM4Transitions

A high resolution magnetic spectrometer has been used to study the internal conversion lines of magnetic four-pole transitions. The $\frac{K}{\mathrm{}(L+M)\mathrm{}}$ internal conversion ratios fall lower than those predicted from the empirical curve of Goldhaber and Sunyar in the region of low values of $\frac{Z^2}{E}$. A revised curve is presented. The following values are obtained for the energy of the transition and for the $\frac{K}{\mathrm{}(L+M)\mathrm{}}$ ratio: ${\mathrm{Y}}^{91}$, 551.2 kev, 6.00; ${\mathrm{Sr}}^{87}$, 388.2 kev, 5.79; ${\mathrm{Y}}^{87}$, 381.3 kev, 5.41; ${\mathrm{Ba}}^{137}$, 661.4 kev, 4.64; ${\mathrm{In}}^{113}$, 391.7 kev, 4.21; and ${\mathrm{In}}^{115}$, 334.6 kev, 3.76. Values are also given for lines in ${\mathrm{Cd}}^{111}$ and ${\mathrm{In}}^{114}$.