Decay of 63Co and 64Co

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Abstract

A new 0·40 ± 0·05 sec activity which was observed to have a β end point energy of 7·0 ± 0·5 MeV was assigned to 64Co. The assignment of a 26 ± 1 sec activity with a single γ-ray of 86·3 ± 0·7 keV and a coincident β-ray of 3·6 ± 0·2 MeV was made to 63Co.

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    Citation Excerpt :

    Additional measurements at lower energy ruled out 62Co and the extracted β-decay endpoint energy of 3.6(2) MeV agreed with β-decay systematics for 63Co. The measured half-life of 52(5) s is significantly larger than the currently accepted value of 26.9(4) s. Ward et al. measured the correct half-life, 26(1) s, in 1969 and suspected that the longer half-life observed by Morinaga et al. was due to a contamination from the 10.5 min isomer 60mCo produced in the reaction 61Ni(γ,p) [40]. We credit Morinaga et al. with the discovery of 63Co because of this explanation for the discrepancy of the half-life and because the correct determination of the β-decay endpoint energy.

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