The first observation of 20Al shows it is a three-proton emitter with a ground-state decay energy of 1.93 MeV, lower than mirror-symmetry predictions and consistent with a 1- spin-parity that differs from its mirror nucleus 20N.
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Mirror Symmetry Breaking Disclosed in the Decay of Three-Proton Emitter 20Al
The first observation of 20Al shows it is a three-proton emitter with a ground-state decay energy of 1.93 MeV, lower than mirror-symmetry predictions and consistent with a 1- spin-parity that differs from its mirror nucleus 20N.