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

A narrow near-threshold proton-emitting resonance (Ex=11.4  MeV, Jπ=1/2+, and Γp=4.4  keV) was directly observed in B11 via proton resonance scattering. This resonance was previously inferred in the β-delayed proton emission of the neutron halo nucleus Be11. The good agreement between both experimental results serves as a ground to confirm the existence of such exotic decay and the particular behavior of weakly bound nuclei coupled to the continuum. R-matrix analysis shows a sizable partial decay width for both, proton and α (Γα=11  keV) emission channels.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 via proton resonance scattering. This resonance was previously inferred in the $\beta$-delayed proton emission of the neutron halo nucleus $^{11}$Be. The good agreement between both experimental results serves as a ground to confirm the existence of such exotic decay and the particular behavior of weakly bound nuclei coupled to the continuum. $R$-matrix analysis shows a sizable partial decay width for both, proton and $\alpha$ emission channels