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Three-centre cluster structure in 11C and 11B

N. Soic·M. Freer·L. Donadille·N. M. Clarke·P. J. Leask·W. N. Catford·K. L. Jones·D. Mahboub·B. R. Fulton·B. J. Greenhalgh·D. L. Watson·D. C. Weisser
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Abstract

Studies of the 16O(9Be,alpha 7Be)14C, 7Li(9Be,alpha 7Li)5He and 7Li(9Be,alpha alpha t)5He reactions at E(beam)=70 and 55 MeV have been performed using resonant particle spectroscopy techniques. The 11C excited states decaying into alpha+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 and 19 MeV are observed. The decay processes are used to indicate the possible three-centre 2alpha+3He (2alpha+3H) cluster structure of observed states. This cluster structure is more prominent in the positive-parity states, where two rotational bands with large deformations are suggested. Excitations of some of the observed T=1/2 resonances coincide with the energies of previously measured T=3/2 isobaric analogs of the 11Be states,indicating that these states may have mixed isospin.

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N. Soic, M. Freer, L. Donadille, N. M. Clarke, P. J. Leask, W. N. Catford, K. L. Jones, D. Mahboub, B. R. Fulton, B. J. Greenhalgh, D. L. Watson, D. C. Weisser. 2005-04-25. Three-centre cluster structure in 11C and 11B. https://doi.org/10.1088/0954-3899%2F31%2F10%2F057

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