High-Resolution Electron Spectroscopic Study of the 60-Hour Electron-Capturing IsomerRe182

A thorough study of the conversion electron spectrum from electron capture decay of the 60-hr ${\mathrm{Re}}^{182}$ isomer is reported. A very large number of transitions are observed, including most of those reported by previous investigations on the beta decay of ${\mathrm{Ta}}^{182}$ to the same daughter nucleus ${\mathrm{W}}^{182}$. In addition many new transitions are observed. Relative intensity comparisons from the present study add weight to a ${\mathrm{Ta}}^{182}$ decay scheme published by earlier investigators. Using the ${\mathrm{Ta}}^{182}$ decay scheme as a base, it was possible to fit most of the new transitions into a plausible decay scheme involving several new levels. A tentative grouping of many of the new levels into rotational bands is proposed, mainly on the basis of relative intensities of gamma transitions depopulating various levels.