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Direct observation of proton emission in 11Be

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arxiv 1907.00114 v2 pith:T7M2NSFM submitted 2019-06-28 nucl-ex

Direct observation of proton emission in 11Be

classification nucl-ex
keywords betaenergyprotontexttimeaboveactivebranching
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The elusive $\beta^-\text{p}^+$ decay was observed in $^{11}$Be by directly measuring the emitted protons and their energy distribution for the first time with the prototype Active Target Time Projection Chamber (pAT-TPC) in an experiment performed at ISAC-TRIUMF. The measured $\beta^-\text{p}^+$ branching ratio is orders of magnitude larger than any previous theoretical model predicted. This can be explained by the presence of a narrow resonance in $^{11}$B above the proton separation energy.

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