Abstract

Data are presented for the 12C(p, n) 12N reaction at 120, 160 and 200 MeV. Angular distributions at 160 MeV show that the spectrum between 2 and 17 MeV excitation energy is dominated by l = 1 spin excitations. The (p, n) spectrum for l = 1 transitions is calculated based on a Cohen-Kurath type of shell-model calculation. The shape of the calculated spectrum agrees well with the experimental spectrum, but with a factor of 2 larger cross section. This is consistent with electron-scattering data for the 19.4 MeV state in 12C, the analogue of the 4.2 MeV state in 12N. Two broad structures at 4 and 7 Me V are identified as being mainly 2 − and 1 − states.

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