Three-centre cluster structure in 11C and 11B
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.
Keywords
Cite
@article{arxiv.nucl-ex/0504026,
title = {Three-centre cluster structure in 11C and 11B},
author = {N. Soic and M. Freer and L. Donadille and N. M. Clarke and P. J. Leask and W. N. Catford and K. L. Jones and D. Mahboub and B. R. Fulton and B. J. Greenhalgh and D. L. Watson and D. C. Weisser},
journal= {arXiv preprint arXiv:nucl-ex/0504026},
year = {2017}
}
Comments
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 G