Optical model parallel description of elastic, fusion and breakup cross sections for systems with weakly bound projectiles

36th Symposium on Nuclear Physics

Camacho, A. Gómez^1 ; Gomes, P.R.S.^2 ; Lubian, J.^2 ; Aguilera, E.F.^1

Departamento de Aceleradores, Instituto Nacional de Investigaciones Nucleares, Apartado Postal 18-1027, C.P. 11801, D.F. México, Mexico^1

Instituto de Fisica, Universidade Federal Fluminenese, Avenida Litoranea s/n, Gragoatá, Niterói, RJ, CEP 24210-340, Brazil^2

关键词: Absorption potential;    Breakup cross sections;    Cross section data;    Dispersion relations;    Polarization potential;    Real and imaginary;    Simultaneous analysis;    Threshold anomalies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/492/1/012005/pdf
DOI  :  10.1088/1742-6596/492/1/012005

来源: IOP

【 摘 要 】

A brief description is presented of the results obtained in recent years for the simultaneous analysis of elastic and fusion cross section data of nuclear reactions for several nuclear systems with weakly bound and halo projectiles. The method used in this description, consists of simultaneously determine the parameters of fusion UFand direct reaction UDRpolarization potentials of Woods-Saxon geometric shapes, that fit the elastic and fusion data. As a matter of fact, UFisan energy dependent potential, with real VFand imaginary WFcomponents, that is responsible for fusion reactions. Similarly, UDRis also energy dependent with real VDRand imaginary WDRparts, that accounts for direct reactions. A general finding for all the systems presented is that, the real and imaginary parts of the fusion potential and direct reaction potentials, are related by a dispersion relation and their energy dependence around and below the Coulomb barrier, show the so-called Breakup Threshold Anomaly. The effect of breakup reactions on fusion cross sections is studied by analyzing the separate effect of the absorption potential WDRand the fusion barrier rising produced by VDR.