Elsevier

Nuclear Physics

Volume 26, Issue 4, September 1961, Pages 616-633
Nuclear Physics

C12 level structure in the excitation region 20.5–26.5 MeV

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Abstract

The absolute cross-section for total neutron emission in the reaction B11 (p, n) C11 has been found by an activation technique over the range of proton energies 4.9 MeV to 11.4 MeV. The excitation function for this reaction is plotted in 10 keV steps of proton energy. Eleven resonances are resolved at proton energies of 5.065, 5.48, 6.03, 7.28, 7.73, 8.25, 8.64, 9.24, 9.79, 10.13 and 10.91 MeV. None of the resonances has an estimated width at half height of less than 70 keV. The cross section has a maximum value of 430±45 mb at 6.03 MeV, at which energy the excitation function is fitted by assuming the existence of a single particle state having Jπ=4. Direct interaction and compound system modes of reaction appear to contribute to the cross section roughly in the ratio 2 : 1 throughout the region of excitation covered. There is some evidence for interference between the two modes. A comparison with other experimental results is made.

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