Isobaric Level Structure forA=47

Abstract

The radioactive properties of ${\mathrm{Ca}}^{47}$, ${\mathrm{Sc}}^{47}$, and ${\mathrm{V}}^{47}$ have been studied. ${\mathrm{Ca}}^{47}$ was found to have a half-life of 4.7±0.1 days and to emit beta radiation in groups of 1940±20 kev (17%) and 660±10 kev (83%) maximum energy. Also observed in the decay were gamma rays of energy 1.31±0.02, 0.83±0.02, and 0.48±0.02 Mev and intensities in the ratio of 13±2:1±0.1:1, respectively. ${\mathrm{Sc}}^{47}$ emits a 160±5 kev gamma ray and beta radiation in groups of 610±5 kev (26%) and 450±10 kev (74%) maximum energy. The gamma ray spectrum of ${\mathrm{V}}^{47}$ was studied and an upper limit of 0.8% was set on the ratio of 160-kev gamma rays to positrons.