Decay strength distributions in {sup 12}C({sup 12}C,{gamma}) radiative capture

Journal Article · Mon Oct 15 00:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.76.044310· OSTI ID:21067795

Jenkins, D G; Fulton, B R; Marley, P; Fox, S P; Glover, R; Wadsworth, R; Watson, D L; Courtin, S; Haas, F; Lebhertz, D; Beck, C; Papka, P; Rousseau, M; Sanchez i Zafra, A; Hutcheon, D A; Davis, C; Ottewell, D; Pavan, M M; Pearson, J; Ruiz, C ^[1]

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1. Department of Physics, University of York, Heslington, York YO10 5DD (United Kingdom)

The heavy-ion radiative capture reaction, {sup 12}C({sup 12}C,{gamma}), has been investigated at energies both on- and off-resonance, with a particular focus on known resonances at E{sub c.m.}=6.0, 6.8, 7.5, and 8.0 MeV. Gamma rays detected in a BGO scintillator array were recorded in coincidence with {sup 24}Mg residues at the focal plane of the DRAGON recoil separator at TRIUMF. In this manner, the relative strength of all decay pathways through excited states up to the particle threshold could be examined for the first time. Isovector M1 transitions are found to be a important component of the radiative capture from the E{sub c.m.}=6.0 and 6.8 MeV resonances. Comparison with Monte Carlo simulations suggests that these resonances may have either J=0 or 2, with a preference for J=2. The higher energy resonances at E{sub c.m.}=7.5 and 8.0 MeV have a rather different decay pattern. The former is a clear candidate for a J=4 resonance, whereas the latter has a dominant J=4 character superposed on a J=2 resonant component underneath. The relationship between these resonances and the well-known quasimolecular resonances as well as resonances in breakup and electrofission of {sup 24}Mg into two {sup 12}C nuclei are discussed.

• OSTI ID: 21067795
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 76, Issue 4; Other Information: DOI: 10.1103/PhysRevC.76.044310; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BGO DETECTORS
CAPTURE
CARBON 12
CARBON 12 REACTIONS
CARBON 12 TARGET
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DISTRIBUTION
ELECTROFISSION
EXCITED STATES
GAMMA DETECTION
GAMMA RADIATION
ISOVECTORS
M1-TRANSITIONS
MAGNESIUM 24
MEV RANGE
MONTE CARLO METHOD
NUCLEAR DECAY
RESONANCE