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Large β-delayed one and two neutron emission rates in the decay of 86Ga
K Miernik1, K P Rykaczewski, C J Gross
1Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA and Faculty of Physics, University of Warsaw, Warsaw PL-00-681, Poland.
Abstract:
Beta decay of 86Ga was studied by means of β-neutron-γ spectroscopy. An isotopically pure ^{86}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 86Ga revealed a half-life of 43(-15)(+21) ms and large β-delayed one-neutron and two-neutron branching ratios of P1n=60(10)% and P2n=20(10)%. The βγ decay of 86Ga populated a 527 keV transition that is interpreted as the deexcitation of the first 2+ state in the N=54 isotone 86Ge and suggests a quick onset of deformation in Ge isotopes beyond N=50.
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