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Elsevier, Physics Letters B, (732), p. 305-308, 2014

DOI: 10.1016/j.physletb.2014.03.062

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Be11(βp), a quasi-free neutron decay?

Journal article published in 2014 by K. Riisager, O. Forstner ORCID, M. J. G. Borge, J. A. Briz, M. Carmona Gallardo, L. M. Fraile ORCID, H. O. U. Fynbo, T. Giles, A. Gottberg, A. Heinz, J. G. Johansen, B. Jonson, J. Kurcewicz, M. V. Lund, T. Nilsson and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We have observed beta(-)-delayed proton emission from the neutron-rich nucleus Be-11 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 B-GT-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 Be-11 halo neutron into a single-proton state. (C) 2014 The Authors. Published by Elsevier B.V.