Decay ofAs74

Abstract

The decay of ${\mathrm{As}}^{74}$ (17.5-day) has been reinvestigated with single and coincidence scintillation spectrometers. The singles spectrum revealed previously unknown gamma rays of 1.19±0.01, 1.60±0.04, and 2.22±0.02 Mev. X-ray—gamma coincidence measurements indicate the 1.19-Mev gamma ray is predominantly associated with the decay to ${\mathrm{Ge}}^{74}$. Evidence is found for 0.6-0.6 Mev gamma-gamma coincidences in ${\mathrm{Ge}}^{74}$. Based on these data, a level scheme for ${\mathrm{Ge}}^{74}$ is presented with excited states at 0.596, 1.19, and 2.22 Mev. No new information concerning the decay to ${\mathrm{Se}}^{74}$ has been gained.