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arxiv 2205.04973 v1 pith:FKJGNFLM submitted 2022-05-10 nucl-ex

Evidence of a near-threshold resonance in ¹¹B relevant to the β-delayed proton emission of ¹¹Be

classification nucl-ex
keywords protonresonanceemissionbetadecaydelayednear-thresholdagreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 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.

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