The Radiations of Lanthanum-140

The radiations of ${\mathrm{La}}^{140}$ have been studied with a magnetic spectrometer of radius 20 cm. The beta spectrum is complex consisting of five groups whose maximum energies are: 0.83 Mev, 1.10 Mev, 1.34 Mev, 1.67 Mev, and 2.15 Mev. Gamma rays with energies of 0.110 Mev, 0.130 Mev, 0.240 Mev, 0.270 Mev, 0.328 Mev, 0.485 Mev, 0.815 Mev, and 1.60 Mev, respectively, were found. The 1.60-Mev gamma is very intense. A tentative decay scheme is proposed.