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Phys. Rev. C 78, 054307 (2008) [10 pages]

Investigation of particle-unbound excited states in light nuclei with resonance-decay spectroscopy using a 12Be beam

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R. J. Charity, S. A. Komarov, and L. G. Sobotka
Departments of Chemistry and Physics, Washington University, St. Louis, Missouri 63130, USA

J. Clifford, D. Bazin, A. Gade, Jenny Lee, S. M. Lukyanov*, W. G. Lynch, M. Mocko, S. P. Lobastov*, A. M. Rogers, A. Sanetullaev, M. B. Tsang, M. S. Wallace, and R. G. T. Zegers
National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy Michigan State University, East Lansing, Michigan 48824, USA

S. Hudan and C. Metelko
Department of Chemistry and Indiana University Cyclotron Facility, Indiana University, Bloomington, Indiana 47405, USA

M. A. Famiano and A. H. Wuosmaa
Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA

M. J. van Goethem
Kernfysisch Versneller Institut, NL-9747 AA Groningen, The Netherlands

Received 2 September 2008; published 10 November 2008

Resonance-decay spectroscopy is used to study particle-unbound excited states produced in interactions of E/A=50 MeV 12Be on polyethylene and carbon targets. The particle-unbound states are produced in a variety of reaction mechanisms, ranging from projectile fragmentation to proton pickup. New proton-decaying excited states are observed in 9Li(E*=14.1±0.1 MeV, Γ=207±49 keV) and 10Be(E*=20.4±0.1 MeV, Γ=182±74 keV). In addition a new α-decaying state is observed in 13B(E*=13.6±0.1 MeV, Γ⩽320 keV). Also found was a 8Be state with E*=23 MeV, Γ=616±30 keV, which decays to the p+3H+α channel. Correlation between the fragments indicates that the decay is initiated by a proton emission to the 4.63-MeV state of 7Li and the spin of the state is J>2. A second T=2 state was confirmed in 12B at 14.82 MeV, which decays to the p+11Be, 3H+9Be, and α+8Li channels. Its width was found to be Γ⩽100 keV and its spin is consistent with Jπ=2+.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.78.054307
DOI:
10.1103/PhysRevC.78.054307
PACS:
21.10.-k, 25.70.Ef, 25.60.-t, 27.20.+n

*On leave from Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, RU-141980 Dubna, Moscow region, Russian Federation.

 
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