Long range effects on the optical model of 6He around the Coulomb barrier

Abstract

We present an optical model (OM) analysis of the elastic scattering data of the reactions 6He+27Al and 6He+208Pb at incident energies around the Coulomb barrier. The bare part of the optical potential is constructed microscopically by means of a double folding procedure, using the Sao Paulo prescription without any renormalization. This bare interaction is supplemented with a Coulomb dipole polarization (CDP) potential, which takes into account the effect of the dipole Coulomb interaction. For this CDP potential, we use an analytical formula derived from the semiclassical theory of Coulomb excitation. The rest of the optical potential is parametrized in terms of Woods-Saxon shapes. In the 6He+208Pb case, the analysis confirms the presence of long range components, in agreement with previous works. Four-body Continuum-Discretized Coupled-Channels calculations have been performed in order to better understand the features of the optical potentials found in the OM analysis. This study searches to elucidate some aspects of the optical potential of weakly bound systems, such as the dispersion relation and the long range (attractive and absorptive) mechanisms.

Accepted in Nucl. Phys. A; 26 pages, 8 figures, 6 tables.

References in corpus (4)

• Four-body continuum-discretized coupled-channels calculations using a transformed harmonic oscillator basis
• Elastic Scattering and Total Reaction Cross Section for the 6He + 27Al System
• Four-body continuum-discretized coupled-channels calculations
• alpha-particle production in the scattering of 6He by 208Pb at energies around the Coulomb barrier

Cited by in corpus (6)

• Comparison of 120Sn(6He,6He)120Sn and 120Sn(alpha,alpha)120Sn elastic scattering and signatures of the 6He neutron halo in the optical potential
• Simultaneous analysis of elastic scattering and transfer/breakup channels for the 6He+208Pb reaction at energies near the Coulomb barrier
• Breakup mechanisms in the 6He+64Zn reaction at near-barrier energies
• ${}^{110,116}$Cd($\alpha ,\alpha$)${}^{110,116}$Cd elastic scattering and systematic investigation of elastic $\alpha$ scattering cross sections along the $Z$ = 48 isotopic and $N$ = 62 isotonic chains
• Systematical study of optical potential strengths in reactions involving strongly, weakly bound and exotic nuclei on ${}^{120}$Sn
• Systematic calculations of reactions with exotic and stable nuclei to establish a unified theoretical approach