Abstract
We have studied the heavy-ion radiative capture reaction12C(12C,γ)24Mg forE cm =4.7–6.0 MeV. Transitions to the ground-, first and unresolved second and third excited states in the final nucleus24Mg have been observed with cross sections as low as 1 nb/sr. Forγ 1 two strong resonance-like structures at 4.9 and 5.0 MeV were found correlated in energy with established 2+ resonances. Statistical model calculations cannot account for the observed yield. The branching ratioΓ γ /Γ associated with theγ 1 decay channel of the 5 MeV resonance was estimated to be 1.1·10−5 yielding aγ-ray strength of 0.8 eV. The experimental result is in agreement with calculations based on the generator coordinate method where broad barrier resonances are viewed as short lived states of quasimolecular nature.
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