Abstract
Studies of the 16O(9Be,α7Be) 14C, 7Li(9Be,α7Li) 5He and 7Li(9Be,ααt)5He reactions at Ebeam ≤ 70 and 55 MeV have been performed using resonant particle spectroscopy techniques. The 11C excited states decaying into α + 7Be(gs) are observed between 8.5 and 13.5 MeV. The α + 7Li(gs), α + 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 2α + 3He (2α + 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 analogues of the 11Be states, indicating that these states may have mixed isospin.
Original language | English |
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Pages (from-to) | S1701-S1704 |
Journal | Journal of Physics G: Nuclear and Particle Physics |
Volume | 31 |
Issue number | 10 |
DOIs | |
Publication status | Published - 1 Oct 2005 |