Naslov
Alpha-decay of excited states in 11C and 11B

Autori
Soić, Neven ; Freer, M. ; Donadille, L. ; Clarke, N.M. ; Leask, P.J. ; Catford, W.N. ; Jones, K.L. ; Mahboub, D. ; Fulton, B.R. ; Greenhalgh, B.J. ; Watson, D.L. ; Weisser, D.C.

Izvornik
Nuclear physics. A (0375-9474) 742 (2004), 3-4; 271-290

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Radovi u časopisima, članak, znanstveni

Ključne riječi
NUCLEAR REACTIONS; 16O(9Be; alpha 7Be); E=70 MeV; 7Li(9Be; alpha 7Li); E=70 MeV; measured particle spectra; 11B; 11C deduced; excited states J; π; alpha -decay properties; rotational bands; cluster structure

Sažetak
Studies of the 16O(9Be, alpha 7Be)14C and 7Li(9Be, alpha 7Li)5He reactions at Ebeam=70 MeV have been performed using resonant particle spectroscopy techniques. The 11C excited states decaying into alpha+7Be(gs) are observed at 8.65, 9.85, 10.7 and 12.1 MeV as well as possible states at 12.6 and 13.4 MeV. This result is the first observation of alpha -decay for excited states above 9 MeV. The alpha+7Li(gs) decay of 11B excited states at 9.2, 10.3, 10.55, 11.2, (11.4), 11.8, 12.5, (13.0), 13.1, (14.0), 14.35, (17.4) and (18.6) MeV is observed. The decay processes are used to indicate the possible three-centre 2alpha+3He(3H) cluster structure of observed states. Two rotational bands corresponding to very deformed structures are suggested for the positive-parity states. Excitations of some observed T=1/2 resonances coincide with the energies of T=3/2 states which are the isobaric analogs of the lowest 11Be states. Some of these states may have mixed isospin.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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