Observation of the exotic nucleus [Formula Presented] via its direct proton decay

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Proton emission from [Formula Presented] was observed for the first time via the [Formula Presented] reaction, using the Holifield Radioactive Ion Beam Facility Recoil Mass Spectrometer in conjunction with a double-sided Si strip detector at the focal plane. The measured energy of the emitted proton is 1.728(10) MeV and its half-life is 3.5(10) μs, the shortest ever observed for ground-state proton radioactivity. When compared to the calculated WKB half-life for an [Formula Presented] transfer, the spectroscopic factor is 0.51(16), which is consistent with the value of 0.64 calculated via the BCS approximation for a spherical nucleus. Also, the half-life of [Formula Presented] was determined with a greater precision than previously available to be 16.7(7) μsec. © 1998 The American Physical Society.

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Physical Review C - Nuclear Physics

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