| The break-up of the 18.2 MeV state in 11Be was studied in a 11Li beta-decay experiment. We report here on the study of the dominating breakup channels involving n alpha 6He or 3n2 alpha in the final state, with special emphasis dedicated in this contribution to the three-particle channel. The two emitted charged particles were detected in coincidence using a highly segmented experimental set-up. The observed experimental energy-vs-energy scatter plot indicates a sequential breakup where nuclei of mass 4, alpha particles, and mass 7, 7He, are involved. A Monte-Carlo simulation of the sequential channel, 11Be* -> alpha + 7He -> nalpha6He was performed and compared to the experimental data and to a simulation of the direct break-up of the 18.2 MeV state nalpha6He by phase space energy distribution. The energy-versus-energy plot are explained by the sequential simulation but not by the phase space simulation. |
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