Conversion Electron Spectra ofCm242andCm244

Abstract

The conversion electron spectra of ${\mathrm{Cm}}^{242}$ and ${\mathrm{Cm}}^{244}$ have been studied by means of two 180° photographic recording beta-ray spectrographs. Conversion coefficient ratios in the $L$ and $M$ subshells have been measured for several $E2\mathrm{}$ transitions in the decay of these nuclides, and the values so obtained compared with theoretical ratios. Accurate energy determinations of the first three excited states in ${\mathrm{Pu}}^{238}$ are reported, and the validity of the Bohr-Mottelson rotational energy formula, including the vibration-rotation interaction term to describe these states, is discussed. A more accurate value is reported for the energy of the first excited state in ${\mathrm{Pu}}^{240}$. The decay of ${\mathrm{I}}^{131}$ is discussed briefly.