| Popis: |
Absolute differential cross sections as a function of angle for the elastic scattering of protons by 12 C, and for the reactions which occur, were measured at incident proton energies E p = 2.39, 2.97, 3.97, 4.99, 5.66, 6.18, 6.65, 6.77, 8.07, 8.39, 8.96, 9.39, 9.81 and 11.60 MeV. Complex phase shifts were obtained to represent the elastic scattering cross sections, the total inelastic cross sections and certain polarization data. The phase-shift values at the above discrete energies were used to estimate a continuous energy dependence for the phase shifts in the range 5.0 ≦ E p ≦ 9.5 MeV, omitting the rapid energy variation due to narrow levels. The estimates were varied slightly to obtain a good fit (except over the narrow levels) to the previously reported cross sections as a continuous function of energy. Finally the narrow levels were included in a calculation of the differential elastic scattering cross section, the total reaction cross section and the polarization at θ lab = 50°, all as a continuous function of energy. The calculation adequately reproduced the experimental data through most of the energy range. Only one of the states close to E p = 9.14 MeV was included in the calculations, so that the results differed significantly from the experimental values above E p = 8.5 MeV. |
