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9th International Conference on Clustering Aspects of Nuclear Structure and Dynamics (CLUSTERS'07), Stratford upon Avon : Royaume-Uni (2007)
Study of β-delayed charged particle emission of 11Li: evidence of new decay channels
M. Madurga, M.J.G. Borge, J.C. Angélique1, L. Bao, U. Bergmann, A. Buta1, J. Cederkäll, J.M. Daugas, C.Aa. Diget, L.M. Fraile, H.O.U. Fynbo, H.B. Jeppesen, B. Jonson, E. Liénard1, F. Marechal2, F.M. Marqués1, V. Meot, F. Negoita, T. Nilsson, G. Nyman, F. Perrot, K. Riisager, O. Roig, O. Tengblad, E. Tengborn, M. Turrion, K.W. Rolander

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.
1 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
2 :  IPNO - Institut de Physique Nucléaire d'Orsay
Structure nucléaire
Physique/Physique Nucléaire Expérimentale