BETA-BETA COINCIDENCE SPECTROMETER

^^^^ *Precisel y determined nuclear ^IJllNV^XJLlJlirNl^Xli ] eV el energies, their ordering, SPECTROMETER lifetime > quantum number assignments, and the mode and character of their radioactive decay are some of the raw ma terials of our understanding of nuclear structure.A powerful new tool for the analysis of complex level schemes . . . the magnetic, iron free, double electron coincidence spectrometer . . .has been designed and built by Argonne scientists.The instrument provides exceptional transmission (~20%--2%) and good resolution (1-0.1%) in each of its independent units.These features, coupled with auxiliary gamma and alpha detectors, also enable Laboratory scientists to study timewise coincidences and angular correlations in electronelectron, electron-gamma and alpha-electron cascades.