Energy distributions of charged particles from three-body decay

Abstract

We compute the energy distributions of charged particles and neutrons emerging from the three-body decay of the 2+-resonances of 6Be and 6Li with isospin 1. These states are isobaric analogue states to the 2+-resonance in 6He. We use hyperspherical adiabatic expansion combined with the complex scaling method. We first investigate the adiabatic potentials and the related eigenfunctions where each has its characteristic contribution to different energy distributions. The microscopic origin of the related decay mechanisms is exhibited. The Coulomb interaction in general broadens the distributions due to long-range couplings. The method is rather efficient in the present cases. Numerically stable distributions are found at intermediate hyperradii where the basis size is sufficient to describe the asymptotic behavior. Different decay mechanisms contribute with sequential α-emission as dominating but also with substantial fractions of direct decay. Computations are consistent with available experiments.