Proton Inelastic Scattering on ^28,29,30Si and Blocking Effect in the Core-Excitation of ²⁹Si

Coupled-Channels Analysis of Nucleon Interaction Data of28'30Si up to 200 MeV Based on the Soft Rotator Model

“…Therefore, it was assumed that the interaction of nucleons with 28 Si proceeds via direct mechanism, which can be described by the optical model. The overall χ 2 was 6.3, which means that the exper- 24) E n = 20.0 25,26) E n = 21.6 28) E n = 30.3 29) E n = 55.0 17) E p = 51.9 34) E p = 65.0 • Olmer et al 35) E p = 80.0…”

“…In the CC analysis, the optical parameters were assumed to be the same as those for 28 Si, except for C viso , C wiso , and the deformation parameters β 20 , β 30 and β 4 . They were searched by the fitting procedure similar to that for 28 Si, in which the inelastic scattering cross sections for 2 + and 3 − levels at 51.9 MeV by Toba et al 17) were used. The obtained parameters are presented in Table 3.…”

“…Also, the prediction for 4 + (4.62 MeV) at 21.7 MeV underestimates slightly the experimental data at forward angles. Figure 8 shows the calculated proton elastic scattering angular distributions compared with the experimental data 17,[31][32][33][34][35] for nine incident energies from 26.2 to 180 MeV for 28 Si. The calculation reproduces the experimental data fairly well at incident energies below 100 MeV, while underestimation is seen at the first and second minima of the angular distributions for energies above 100 MeV.…”

“…In Fig. 9, the CC-SRM results are compared with the experimental data 17,33,36) of the angular distributions of proton inelastic scattering leading to the 2 + (1.779 MeV), 4 + (4.617 MeV), 6 + (8.543 MeV) states and the first negative parity 3 − (6.879 MeV) state. The calculation reproduces the experimental data rather well.…”

“…7 Comparison of the calculated and experimental angular distributions 23,26,27) for neutron inelastic scattering from 28 Si nucleus JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY Fig. 8 Comparison of the calculated and experimental angular distributions 17,[31][32][33][34][35] for proton elastic scattering from 28 Si nucleus Fig. 9 Comparison of the calculated and experimental angular distributions 17,33,36) for proton inelastic scattering from 28 Si nucleus tory, although the prediction is somewhat larger than the experimental data below 30 MeV.…”