Decay ofNi56

The radioactive decay of ${\mathrm{Ni}}^{56}$ to ${\mathrm{Co}}^{56}$ (half-life remeasured, 6.10±0.02 days) has been investigated using scintillation gamma-ray spectrometers, both singly and in coincidence. The spectra revealed gamma rays of 0.164±0.003(99.3±6.6), 0.272±0.004(31.5±5.2), 0.484±0.004(34.6±2.0), 0.755±0.003(48.0±3.2), 0.820±0.003(84.9±8.3), 0.982±0.010(1.2±0.1), and 1.57±0.01(14.1±0.9) MeV. The intensities of the gamma rays (number per 100 decays) appear in parentheses. The data were consistent with an upper limit of 1 per 100 decays for the intensity of any positron emission. Coincidence spectra, angular-correlation measurements, and delayed-coincidence measurements permitted the construction of a decay scheme with energy levels at 0.00($4^{+}$), 0.164($3^{+}$), 0.984($2^{+}$), 1.47($1^{-}$,$2^{\pm }$), and 1.74($1^{+}$) MeV. The level scheme is compared with other recent work concerning the energy levels of ${\mathrm{Co}}^{56}$.