The neutron-unbound nucleus 15Be was observed for the ﬁrst time. It was populated using neutron transfer from a deuterated polyethylene target with a 59 MeV/u 14Be beam. Neutrons were measured in coincidence with outgoing 14Be particles and the reconstructed decay energy spectrum exhibits a resonance at 1.8(1) MeV. This corresponds to 15Be being unbound by 0.45 MeV more then 16Be thus signiﬁcantly hindering the sequential two-neutron decay of 16Be to 14Be through this state.
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Snyder, J., et al. (2013)"First Observation of 15Be." Physical Review C 88(3):031303.
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Original version is available from the publisher at: http://prc.aps.org/abstract/PRC/v88/i3/e031303