Observation of the 2$^+$ isomer in $^{52}$Co


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We report the first observation of the 2$^+$ isomer in $^{52}$Co, produced in the $beta$ decay of the 0$^+$, $^{52}$Ni ground state. We have observed three $gamma$-rays at 849, 1910, and 5185 keV characterizing the $beta$ de-excitation of the isomer. We have measured a half-life of 102(6) ms for the isomeric state. The Fermi and Gamow-Teller transition strengths for the $beta$ decay of $^{52m}$Co to $^{52}$Fe have been determined. We also add new information on the $beta$ decay of the 6$^+$, $^{52}$Co ground state, for which we have measured a half-life of 112(3) ms.

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