Decay Chain ${\mathrm{Ca}}^{49}$-${\mathrm{Sc}}^{49}$-${\mathrm{Ti}}^{49}$

The decays of ${\mathrm{Ca}}^{49}$ and its daughter have been studied by beta- and gamma-ray scintillation spectroscopy. ${\mathrm{Ca}}^{49}$ was observed to decay with a half-life of 8.75±0.20 minutes, exciting gamma-ray transitions in ${\mathrm{Sc}}^{49}$ of 3.10±0.03, 4.05±0.05, and 4.68±0.05 Mev energy and relative intensities of 1.0, 0.11±.02, and 0.0038±0.0010. Two beta-ray groups were resolved from the ${\mathrm{Ca}}^{49}$ spectrum of energy 1.95±0.05 and 0.89±0.15 Mev. In agreement with previous work, ${\mathrm{Sc}}^{49}$ was found to be a pure beta emitter. The beta-ray energy of ${\mathrm{Sc}}^{49}$ was measured as 2.05±0.05 Mev, and the half-life was found to be 57.2±0.7 minutes. Spin assignments are proposed on the basis of the single-particle model.