${}^{16}\mathrm{O}+{}^{16}\mathrm{O}$ inelastic scattering studied by a complex $G$-matrix interaction

We reanalyze the ${}^{16}\mathrm{O}+{}^{16}\mathrm{O}$ inelastic scattering to the single $2_1^{+}$ and $3_1^{-}$ excitation channels at an incident energy of $E_{\mathrm{lab}}=1120$ MeV by a microscopic coupled-channel (CC) calculation with complex $G$-matrix interaction. The imaginary part of the folded potential is renormalized so as to reproduce the elastic angular distribution. It is found that the results of full CC calculations are still inconsistent with the experimental data for both $2_1^{+}$ and $3_1^{-}$ channels. It is also found that when the imaginary coupling terms are omitted, the calculated $2_1^{+}$-channel cross sections are improved, although the $3_1^{-}$-channel cross sections are slightly overestimated.

Figure 1

The angular distributions for the ${}^{16}\mathrm{O}+{}^{16}\mathrm{O}$ elastic 2${}_1^{+}$ and 3${}_1^{-}$ channels at an incident energy of $E_{\mathrm{lab}}=1120$ MeV. The solid circles are the experimental data [5]. The solid curves represent the results of the full CC calculations, while the dashed curves represent the results of the three-channel calculations. Panels (a) and (b) show the results with CEG07b and CEG07c,respectively.

Figure 2

Comparison between the result of the full CC calculation with imaginary coupling potential (dashed) and that without imaginary coupling potential (solid). The dashed curves are the same as the solid curves in Fig. 1. The renormalization factors for the imaginary potential $N_I$ are shown in the parentheses. Panels (a) and (b) show the results with CEG07b and CEG07c, respectively.