Disintegration ofK43

The nuclear spectrum of ${\mathrm{K}}^{43}$ (22.0 hr) has been studied with the help of a magnetic lens spectrograph. ${\mathrm{K}}^{43}$ decays to ${\mathrm{Ca}}^{43}$, emitting gamma rays having energies 0.369, 0.627, 0.219, 0.393, and 1.00 Mev, the last three being weak. Five beta-ray groups were found, of energies 1.839, 1.218, 0.927, 0.460, and 0.243 Mev with relative abundance of 1.6, 5.4, 83.1, 5.4, and 4.5 percent, respectively. A disintegration scheme is proposed. The ${\mathrm{K}}^{43}$ was prepared by the reaction ${\mathrm{A}}^{40}(\alpha , p){\mathrm{K}}^{43}$.