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Studies of the 16O(9Be,alpha 7Be)14C, 7Li(9Be,alpha 7Li)5He and 7Li(9Be,alphaalpha t)5He reactions at E(beam)=70 and 55 MeV have been performed usingresonant particle spectroscopy techniques. The 11C excited states decaying intoalpha+7Be(gs) are observed between 8.5 and 13.5 MeV. The alpha+7Li(gs),alpha+7Li*(4.652 MeV) and t+8Be(gs) decays of 11B excited states between 9 and19 MeV are observed. The decay processes are used to indicate the possiblethree-centre 2alpha+3He (2alpha+3H) cluster structure of observed states. Thiscluster structure is more prominent in the positive-parity states, where tworotational bands with large deformations are suggested. Excitations of some ofthe observed T=1/2 resonances coincide with the energies of previously measuredT=3/2 isobaric analogs of the 11Be states,indicating that these states may havemixed isospin.Comment: Contribution for the proceedings of the NUSTAR'05: NUclear STructure,  Astrophysics and Reactions, University of Surrey, Guildford, UK; accepted for  publication in Journal of Physics

Three-centre cluster structure in 11C and 11B

Three-centre cluster structure in ¹¹C and ¹¹B