Abstract

We measured the half-life of $^{66}\mathrm{Ga}$ by observing positrons from the ${\ensuremath{\beta}}^{+}$ branch to the ground state of $^{66}\mathrm{Zn}$ with a superconducting Wu-type beta spectrometer. Our result is ${t}_{1/2}=9.304(8)\mathrm{hours}$, which is the highest-precision measurement to date and disagrees with the Nuclear Data Sheets (NDS) value by over $6\ensuremath{\sigma}$.

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