Be11(βp), a quasi-free neutron decay?
- Riisager, K.
- Forstner, O.
- Borge, M.J.G.
- Briz, J.A.
- Carmona-Gallardo, M.
- Fraile, L.M.
- Fynbo, H.O.U.
- Giles, T.
- Gottberg, A.
- Heinz, A.
- Johansen, J.G.
- Jonson, B.
- Kurcewicz, J.
- Lund, M.V.
- Nilsson, T.
- Nyman, G.
- Rapisarda, E.
- Steier, P.
- Tengblad, O.
- Thies, R.
- Winkler, S.R.
Publication date
May 2014
DOI Publisher
The Authors. Published by Elsevier B.V.Abstract
AbstractWe 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
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