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A narrow near-threshold proton-emitting resonance (Ex = 11.4 MeV, J$^{\pi}$ =1/2$^{+}$ and $\Gamma_{p}$ = 4.4 keV) was directly observed in $^{11}$B viaproton resonance scattering. This resonance was previously inferred in the$\beta$-delayed proton emission of the neutron halo nucleus $^{11}$Be. The goodagreement between both experimental results serves as a ground to confirm theexistence of such exotic decay and the particular behavior of weakly boundnuclei coupled to the continuum. $R$-matrix analysis shows a sizable partialdecay width for both, proton and $\alpha$ emission channels.

Evidence of a near-threshold resonance in $^{11}$B relevant to the $\beta$-delayed proton emission of $^{11}$Be