Some investigations on the decay of60Co

The⁶⁰Co decay has been reinvestigated using an electromagneticβ-spectrometer and a Ge(Li)γ-spectrometer. A new weakβ ^?-transition of characterΔJ=3, no parity change between the 5⁺ groundstate of⁶⁰Co and the second excited 2⁺ level atE=2.155 MeV in⁶⁰Ni could be established. The endpoint energies and intensities of the threeβ ^?-transitions are: $$\begin{gathered} E_{\beta \bar 1\max } = \left( {1.492 \pm 0.020} \right)MeV,I_{\beta \bar 1} = \left( {0.08 \pm 0.02} \right)\% ; \hfill \\ E_{\beta \bar 2\max } = \left( {0.670 \pm 0.020} \right)MeV,I_{\beta \bar 2} = \left( {0.18 \pm 0.03} \right)\% ; \hfill \\ E_{\beta \bar 3\max } = \left( {0.315 \pm 0.004} \right)MeV,I_{\beta \bar 3} = \left( {99.74 \pm 0.05} \right)\% ; \hfill \\ \end{gathered} $$ . The intensity ratio of the stopover and crossoverγ-transitions deexciting the 2.155 MeV level has been determined to be ≧120. Some conclusions for the theory are discussed.