Abstract
Beta decay of $^{86}\mathrm{Ga}$ was studied by means of $\ensuremath{\beta}$-neutron-$\ensuremath{\gamma}$ spectroscopy. An isotopically pure $^{86}\mathrm{Ga}$ beam was produced at the Holifield Radioactive Ion Beam Facility using a resonance ionization laser ion source and high-resolution electromagnetic separation. The decay of $^{86}\mathrm{Ga}$ revealed a half-life of ${43}_{\ensuremath{-}15}^{+21}\text{ }\text{ }\mathrm{ms}$ and large $\ensuremath{\beta}$-delayed one-neutron and two-neutron branching ratios of ${P}_{1n}=60(10)%$ and ${P}_{2n}=20(10)%$. The $\ensuremath{\beta}\ensuremath{\gamma}$ decay of $^{86}\mathrm{Ga}$ populated a 527 keV transition that is interpreted as the deexcitation of the first ${2}^{+}$ state in the $N=54$ isotone $^{86}\mathrm{Ge}$ and suggests a quick onset of deformation in Ge isotopes beyond $N=50$.
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