The Disintegration Scheme of Cerium (141)

The beta-rays of ${\mathrm{Ce}}^{141}$ have a maximum energy of 0.44 Mev. An absorption curve in lead of the gamma-radiation yields a quantum energy of 0.13 Mev. This gamma-ray is coincident in time with the beta-ray spectrum. Beta-beta-coincidences are present in the disintegration of ${\mathrm{Ce}}^{141}$, showing that the gamma-ray is to some extent converted. The beta-rays of ${\mathrm{Pr}}^{143}$ have a maximum energy of 0.835 Mev.