Observation and spectroscopy of proton-unbound nucleus 21Al
Abstract
We report on the observation of previously-unknown isotope 21Al, the first unbound aluminum isotope located beyond the proton dripline. The 21Al nucleus decays by one-proton (1p) emission, and its in-flight decays were detected by tracking trajectories of all decay products with micro-strip silicon detectors. The 1p-emission processes were studied by analyses of the measured angular correlations of decay products 20Mg+p. The 1p-decay energies of ground and low-lying excited states of 21Al, its mass excess and proton separation energy value Sp=-1.1(1) MeV were determined.
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