Abstract
Angular distributions of eight neutron groups have been measured at 4.2 and 5.2 MeV and excitation curves for these groups were also obtained between 3.5 and 5.8 MeV, using a time-of-flight spectrometer. These results indicate strongly that the reaction is predominantly a direct one. Calculations have been made using DWBA double stripping theory and good agreement is obtained for the forward part of the angular distributions for several groups. The knock-on model predicts very similar angular distributions to double stripping, and these models may be equally applicable. The presence of L = 0 components in transitions where double stripping with L = 0 is forbidden, and a comparison of the present results with Be 9 (He 3, p) data suggest that both these processes contribute in Be 9(He 3, n). Strong L = 0 components were observed for the groups leading to the ground state, 4.81 and 8.10 MeV levels of C 11, indicating J π ≦ 5 2 − for these levels.
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