Study of beta-delayed 3-body and 5-body breakup channels observed in the decay of Li-11

摘要

The beta-delayed charged particle emission from Li-11 has been studied with emphasis on the three-body n alpha He-6 and five-body 2 alpha 3n channels from the 10.59 and 18.15 MeV states in Be-11. Monte Carlo simulations using an R-matrix formalism lead to the conclusion that the A He resonance states play a significant role in the break-up of these states. The results exclude an earlier assumption of a phase-space description of the break-up process of the 18.15 MeV state. Evidence for extra sequential decay paths is found for both states. (C) 2008 Elsevier B.V. All rights reserved.