The Radioactive Decay of Tungsten 187

Abstract

Using sources derived from neutron capture in enriched (97.5 percent) ${\mathrm{W}}^{186}$, about 40 internally converted electron lines are recorded in photographic magnetic spectrometers. Their interpretation leads to the evaluation of 14 gamma-rays in rhenium 187, seven of which had not been previously observed. It is possible to arrange these transitions in a consistent level scheme for the rhenium 187 nucleus. The $\frac{K}{L}$ ratios are determined for five of the gamma-rays and the multipolarity and nature of the transitions proposed.