Decay spectroscopy observes one-proton emission in aluminum-21, highlighting nuclear structure beyond the proton dripline.
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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Kostyleva et al. (2024) studied this question.
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