Elastic and inelastic scattering of $^{16}$O on $^{27}$Al and $^{28}$Si at 240 MeV

TL;DR

This study presents experimental angular distribution data for elastic and inelastic scattering of $^{16}$O on $^{27}$Al and $^{28}$Si at 240 MeV, comparing results with coupled channel calculations to analyze nuclear interaction parameters.

Contribution

First detailed experimental data at this energy for these systems with coupled channel analysis including excited states.

Findings

Angular distributions are sensitive to the nuclear surface diffuseness.

Best fit achieved with diffuseness parameter a = 0.62 fm.

Data supports the optical model parameters for these systems.

Abstract

The nuclear scattering at energies well above the Coulomb barrier allows for a fairly sensitive examination of the parameters of the optical potential when the relevant couplings are included into the calculations. In this work we present experimental angular distribution data for the elastic and inelastic scatterings of $^{16}$O impinging on $^{27}$Al and $^{28}$Si target nuclei at \textit{E}$_{lab}=240$ MeV. The experimental data were measured at $7\degree < \theta_{c.m.} < 16\degree$ with good angular resolution. Experimental data are compared with coupled channel calculations with the inclusion of couplings to excited states in the target and projectile. We show that the shape of angular distributions are sensitive to the mass diffuseness parameter and the best agreement is achieved for $a = 0.62$ fm.