The analysis of the elastic scattering of the 6He+208Pb nuclear system using the new B3Y-Fetal potential

Abstract

At energies close to the Coulomb barrier, a semi-microscopic analysis of the angular distribution of elastic scattering of the halo nucleus 6He on the heavy nucleus 208Pb was performed. In this analysis, the effectiveness of the new B3Y-Fetal folding potential for the large asymmetric 6He+208Pb system was investigated. The effective NN interactions, M3Y and B3Y potentials, were constructed taking into account the distribution features of the weakly bound neutrons of the 6He halo nucleus in the strong Coulomb field of the 208Pb nucleus. These density-dependent folding potentials were used as the real part of the optical model potential. The obtained results successfully reproduce the experimental data on elastic scattering. The new B3Y-Fetal potential provides a more accurate description of the NN interaction at large distances in highly asymmetric systems, thereby yielding a more precise prediction of the angular distributions of elastic scattering. The densitydependent modified CDM3Y6-Paris and CDB3Y6-Fetal potentials offer a more realistic description of NN interactions in nuclear matter, since the density-dependent parameters C, α, β, and γ were chosen based on the value of the incompressibility coefficient K calculated at the saturation point. For the 6He+208Pb system at energies Elab = 22 and 27 MeV, a set of optimal parameters for elastic scattering cross sections near the Coulomb barrier was determined. The effectiveness of the new B3Y-Fetal potential in describing the angular distribution of elastic scattering was confirmed. The results of the semi-microscopic analysis are characterized by the renormalization factor Nr and the χ²/N coefficients. The obtained results may contribute to nuclear astrophysics, particularly to studies of halo nuclei structures and the mechanisms of nuclear interaction processes.