Publication: Be11(βp), a quasi-free neutron decay?
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Publication Date
2014-04-04
Authors
Riisager, K.
Forstner, O.
Borges, M. J. G.
Carmona Gallardo, Mariano
Fynbo, H.O.U.
Giles, T.
Gottberg, A.
Heinz, A.
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Elsevier
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Abstract
We have observed β−-delayed proton emission from the neutron-rich nucleus 11Be by analyzing a sample collected at the ISOLDE facility at CERN with accelerator mass spectrometry (AMS). With a branching ratio of (8.3±0.9)· 10−6 the strength of this decay mode, as measured by the BGT -value, is unexpectedly high. The result is discussed within a simple single-particle model and could be interpreted as a quasi-free decay of the 11Be halo neutron into a single-proton state.