The neutron-unbound nucleus 13Be was populated with a nucleon-exchange reaction from a 71 MeV/u secondary 13B beam. The decay energy spectrum was reconstructed using invariant mass spectroscopy based on 12Be fragments in coincidence with neutrons. The data could be described with an s-wave resonance at E = 0.73(9) MeV with a width of Gamma = 1.98(34) MeV and a d-wave resonance at E = 2.56(13) MeV with a width of Gamma = 2.29(73) MeV. The observed spectral shape is consistent with previous one-proton removal reaction measurements from 14B.
@article{arxiv.1512.00735,
title = {Population of 13Be in a Nucleon Exchange Reaction},
author = {B. R. Marks and P. A. DeYoung and J. K. Smith and T. Baumann and J. Brown and N. Frank and J. Hinnefeld and M. Hoffman and M. D. Jones and Z. Kohley and A. N. Kuchera and B. Luther and A. Spyrou and S. Stephenson and C. Sullivan and M. Thoennessen and N. Viscariello and S. J. Williams},
journal= {arXiv preprint arXiv:1512.00735},
year = {2015}
}