The nuclide ${\mathrm{Cr}}^{48}$ has been produced by spallation of Ni. It decays by electron capture only with a half life of 23 hours and emits gamma rays of 116 kev ($M1\mathrm{}$) and 305 kev ($E2\mathrm{}$) of equal intensity, which are in coincidence. The genetic relationship with 16.2-day ${\mathrm{V}}^{48}$ establishes the mass assignment. The total decay energy of ${\mathrm{Cr}}^{48}$ can be estimated as 1.45±0.20 Mev. Two alternative decay schemes are proposed.

• Received 5 May 1955

DOI:https://doi.org/10.1103/PhysRev.100.223