Pauli exchange effects in the elastic scattering of 16O + 16O

Refractive scattering and reactions, comparison of two systems:16O+16O and20Ne+12C

“…For ex/tmple, the properties of the nucleon-nucleon (NN) interaction in the nucleur medium, its densityand momentum dependence. The effects of the Pauli principle become also very substantial in the overlapping region, they have been discussed previously in a larger number of theoretical papers [4, 10~16] and now seem to be reflected in the experimental results [10].…”

“…More details on the improved version of the M3Y/FRE folded potential will be given somewhere else [29]. Due to this fact as well as to a better treatment of the Coulomb potential (by folding two uniform charge distributions) the optical parameters obtained in our folding analysis (Table 3) are slightly different from those of [10]. It can be seen from Fig.…”

“…One of these approaches is to impose on the M3Y effectiveNN interaction an explicit density dependence [23] (the so-called DDM3Y potential). Another treats more accurately the exchange effects between the projectile nucleons and the target nucleons [10,14,16] (the so-called M3Y/FRE potential). In the present paper we have used all these 3 types (M3Y, DDM3Y and M3Y/FRE) of the folded potential in the optical model analysis of our data, especially for the 160+160 case where a rainbow pattern was observed [7].…”

“…We note that in the calculation of the M3Y/FRE potential, an exact iteration procedure has been used instead of the approximated method based on a cut-off of high-order terms in a series expansion of the Bessel function [10,16]. The obtained M3Y/FRE potential for the considered 160 "~ 160 system is identical to the different real folded potentials using imaginary potentials consisting of a volume and a surface WS term with parameters given in Table 3 one reported in [10] at radii R > 2 fm, while at the smallest distances it is more attractive and does not show a repulsive behavior as found in [10]. More details on the improved version of the M3Y/FRE folded potential will be given somewhere else [29].…”

“…We have adopted an imaginary potential consisting of a volume-and a surface term which has been proved necessary [6,10] in many cases of light HI scattering where a refractive rainbow structure was observed. The Coulomb potential is generated by folding two uniform charge distributions with the radii taken from the electron scattering data.…”