Abstract
The 90° yield of protons was measured for the 12C( γ, p) 11B reaction using bremsstrahlung of 37.7 MeV end-point energy. While moderate structure has previously been seen in 12C( γ, n) 11C total cross-section measurements which summed over all states of 11C, no significant structure is found with comparable energy resolution in the 12C( γ, p 0) 11C reaction above 30 MeV. It is deduced that the 1 s −1 1 p 1 2 hole-particle configuration is probably concentrated in either of the relatively strong levels at 31.5 ± 1.3 MeV and 35.7 ± 0.7 MeV excitation energy or is split between them.
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