Nucleon-induced excitation of collective bands in 12C

Shape and angular distribution of the 4.439-MeV γ -ray line from proton inelastic scattering off C12

“…Kolata, Auble & Galonsky [28] published partial γ-ray spectra around the second escape For E p = 40 MeV, a line shape at θ = 90 • and the γ-ray angular distribution have been published by Lang et al [29]. The line shape is well reproduced by a pure direct reaction component, calculated with the potential of Meigooni et al [23], but there is an obvious disagreement between the calculated and the mesured angular distribution, see Fig. 8.…”

“…There, other potentials from the compilation of Perey and Perey [33] were also tried and sometimes provided a better description of the data. The J π of the best adjustment corresponds in nearly all cases to a resonance state in 13 The potential of Meigooni et al [23] gave good results in the E p = 20-25 MeV range but was not able to reproduce several of the experimental data below 8 MeV. Attempts with modified strengths of the surface imaginary potentials and different coupling schemes could in some cases improve the agreement with data, but were not conclusive.…”

“…Meigooni et al [23], who used it in coupled-channels calculations to derive an energyand channel-dependent potential for nucleon scattering off 12 C in the range E n = 20-100…”

“…pointing out a largely dominating direct reaction component. For this component, the potential of Meigooni et al[23] is very successful, predicting correctly the line shapes up to E p = 40 MeV and the angular distributions up to E p = 25 MeV with certainty, and very probably up to E p = 40 MeV. It is worth noting that this potential, developed for elastic and inelastic nucleon scattering off12 C in the range E n = 20 -100 MeV should then also give quite reasonable line shapes and γ-ray angular distributions up to 100 MeV.…”

γ-ray production by proton and α-particle induced reactions onC12,O16Belhout1, Kiener2, Coc3 et al. 2007Phys. Rev. C3016503View full textAdd to dashboardCite

“…16. The measured data are particularly well reproduced by the sum of the calculated HF and direct cross sections, the latter being evaluated using the coupled-channels method applied to the states of the first rotational band in 12 C. The optical potential of A. S. Meigooni et al [36] has been used to evaluate the contributions of the different nuclear reaction mechanisms to the total reaction cross section. The preequilibrium contribution for this reaction was found to be negligible.…”