Decay ofCa49andSc49

${\mathrm{Ca}}^{49}$ has been found to decay with a half-life of 8.9±0.2 minutes. It emits two principal beta components of energies 2.12±0.10 and about 1.0 Mev in coincidence, respectively, with gamma rays of 3.07±0.05 and 4.04±0.06 Mev. The intensity ratio of these two branches is 8.5:1. The intensity of a possible ground-state beta branch is less than 1%, and that of a possible 0.98-Mev gamma transition between the 3.07- and 4.04-Mev levels is less than 3%. These data indicate that these excited states are respectively the single-particle $p_{\frac{3}{2}}$ and $f_{\frac{5}{2}}$ levels available for excitation of the twenty-first proton in ${\mathrm{Sc}}^{19}$. ${\mathrm{Sc}}^{49}$ is found to emit in turn a single beta component of energy 1.80±0.10 Mev.