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The exotic $\beta$-delayed proton emission is calculated in $^{11}$Be fromfirst principles using chiral two- and three-nucleon forces. To investigate theunexpectedly-large branching ratio measured in [PRL 123, 082501 (2019)] wecalculate the proposed $(1/2^+,1/2)$ proton resonance in $^{11}$B using theno-core shell model with continuum. This calculation helps to address whetherthis enhancement is caused by unknown dark decay modes or an unobserved protonresonance. We report a branching ratio of $b_p = (1.3\pm0.5)\times10^{-6}$,suggesting that its unexpectedly-large value is caused by an unobserved protonresonance in $^{11}$B.

Ab initio calculation of the $\beta$-decay from $^{11}$Be to a p${+}^{10}$Be resonance