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Study of β-delayed charged particle emission of 11Li: evidence of new decay channels

Abstract : 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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Submitted on : Wednesday, May 27, 2009 - 9:29:24 AM
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M. Madurga, M.J.G. Borge, J.C. Angélique, L. Bao, U. Bergmann, et al.. Study of β-delayed charged particle emission of 11Li: evidence of new decay channels. 9th International Conference on Clustering Aspects of Nuclear Structure and Dynamics (CLUSTERS'07), 2007, Stratford upon Avon, United Kingdom. pp.012024, ⟨10.1088/1742-6596/111/1/012024⟩. ⟨in2p3-00388599⟩



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