Abstract
Gamma ray spectrum from silicon bombarded by 5.7 MeV protons has been studied by a scintillation spectrometer. The following gamma rays due to inelastic scattering of protons were observed. 1.78 MeV ( 28 Si 1st–ground), 1.28 MeV ( 29 Si 1st–ground), 2.03 MeV ( 29 Si 2nd–ground), 2.43 MeV ( 29 Si 3rd–ground), 2.24 MeV ( 30 Si 1st–ground). Excitation curves for the 1.78 MeV gamma rays have been measured in the proton energy range from 2.2 to 5.7 MeV. Resonances were found at 2.9, 3.5, 4.4, 5.0 and 5.4 MeV. At 5.4 MeV, the angular distribution of the 1.78 MeV gamma rays was measured. By comparison with theory, the corresponding compound level of 29 P at 7.9 MeV was assigned d 5/2 . The cross section for this process is 250 mb.
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