Abstract
A pulsed beam neutron time-of-flight spectrometer has been used to study the reaction9Be(α, n)12C* at bombarding energies of 5.53, 5.76 and 5.97 MeV. Angular distributions of neutron groups leading to the ground state and first two excited states of12C were measured, and the population ratio of the 4.433 and 7.656 MeV levels has been established as 10.7±0.8 at ∼5.5 MeV. In conjunction with other evidence the measured value of population ratio establishes the alpha particle decay width of the 7.656 MeV level as approximately the Wigner limit, the spin and parity as 0+, and allows estimates to be made of the probabilities of pair and γ decay of this state.
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