β −p and β−α decay of the 11Be neutron halo ground state

Abstract

Beta-delayed proton emission from the neutron halo ground state of 11Be raised much attention due to the unusually high decay rate. It was argued that this may be due to the existence of a resonance just above the proton decay threshold. In this letter, we use the lenses of real-energy continuum shell model to describe several observables including the Gamow–Teller rates for the β −-delayed α and proton decays, and argue that, within our model, the large β −p branching ratio cannot be reconciled with other data.