Two neutron decay of 16Be
1 Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
2 Lawrence Livermore National Laboratory, L-414, Livermore, California 94551, USA
Published online: 25 March 2016
Recently, the first example of two-neutron decay from the ground state of an unbound nucleus, 16Be, was seen (A. Spyrou, et. al., Phys. Rev. Lett. 108 102501 (2012)). Three-body methods are ideal for exactly treating the degrees of freedom important for these decays. Using a basis expansion over hyperspherical harmonics and the hyperspherical R-matrix method, we construct a realistic model of 16Be in order to investigate its decay mode and the role of the two-neutron interaction. The neutron-14Be interaction is constrained using shell model predictions. We obtain a ground state for 16Be that is under-bound by approximately 0.7 MeV with a width of approximately 0.17 MeV. For such a system, an attractive three-body force must be included to reproduce the experimental ground state energy.
© Owned by the authors, published by EDP Sciences, 2016
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