Precise absoluteγ-ray andβ−-decay branching intensities in the decay ofCu2967

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Absolute $\ensuremath{\gamma}$-ray emission probabilities in the ${\ensuremath{\beta}}^{\ensuremath{-}}$ decay of $^{67}\mathrm{Cu}$ were measured by means of $\ensuremath{\gamma}$-ray and ${\ensuremath{\beta}}^{\ensuremath{-}}$-decay singles and ${\ensuremath{\beta}}^{\ensuremath{-}}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidences. The new results, together with the known decay scheme of $^{67}\mathrm{Cu}$, were used to determine absolute ${\ensuremath{\beta}}^{\ensuremath{-}}$-decay branching intensities. The present data differ significantly from previously published values. In addition, the half-life of the ${I}^{\ensuremath{\pi}}={\frac{1}{2}}^{\ensuremath{-}}$ isomer in $^{67}\mathrm{Zn}$ was measured as ${T}_{1/2}=9.37(4) \ensuremath{\mu}\mathrm{s}$, in a good agreement with earlier measurements. From the analysis of the Fermi--Kurie plots, ${Q}_{{\ensuremath{\beta}}^{\ensuremath{-}}}(\text{g.s.})=560.3(10)$ keV was deduced, which differs from the previously measured value of 577(8) keV but is in good agreement with ${Q}_{{\ensuremath{\beta}}^{\ensuremath{-}}}(\text{g.s.})=561.3(15)$ keV recommended in the latest Atomic Mass Evaluation.