Evidence of a near-threshold resonance in $^{11}$B relevant to the $\beta$-delayed proton emission of $^{11}$Be
- Ayyad, Y.
- Mittig, W.
- Tang, T.
- Olaizola, B.
- Potel, G.
- Rijal, N.
- Watwood, N.
- Alvarez-Pol, H.
- Bazin, D.
- Caamaño, M.
- Chen, J.
- Cortesi, M.
- Fernández-Domínguez, B.
- Giraud, S.
- Gueye, P.
- Heinitz, S.
- Jain, R.
- Kay, B.P.
- Maugeri, E.A.
- Monteagudo, B.
- Ndayisabye, F.
- Paneru, S.N.
- Pereira, J.
- Rubino, E.
- Santamaria, C.
- Schumann, D.
- Surbrook, J.
- Wagner, L.
- Zamora, J.C.
- Zelevinsky, V.
DOIAbstract
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 ...
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