Comparison of 120Sn(6He,6He)120Sn and 120Sn(alpha,alpha)120Sn elastic scattering and signatures of the 6He neutron halo in the optical potential

Abstract

Cross sections of ${}^{120}$Sn($\alpha$,$\alpha$)${}^{120}$Sn elastic scattering have been extracted from the $\alpha$ particle beam contamination of a recent ${}^{120}$Sn(${}^6$He,${}^6$He)${}^{120}$Sn experiment. Both reactions are analyzed using systematic double folding potentials in the real part and smoothly varying Woods-Saxon potentials in the imaginary part. The potential extracted from the ${}^{120}$Sn(${}^6$He,${}^6$He)${}^{120}$Sn data may be used as the basis for the construction of a simple global ${}^6$He optical potential. The comparison of the ${}^6$He and $\alpha$ data shows that the halo nature of the ${}^6$He nucleus leads to a clear signature in the reflexion coefficients ${\eta }_L$: the relevant angular momenta $L$ with ${\eta }_L\gg 0$ and ${\eta }_L\ll 1$ are shifted to larger $L$ with a broader distribution. This signature is not present in the $\alpha$ scattering data and can thus be used as a new criterion for the definition of a halo nucleus.

13 pages, 7 figures, accepted for publication in Phys. Rev. C

References in corpus (9)

• Fusion and Direct Reactions of Halo Nuclei at Energies around the Coulomb Barrier
• Analysis of bulk and surface contributions in the neutron skin of nuclei
• Improved di-neutron cluster model for 6He scattering
• New reaction rate for 16O(p,gamma)17F and its influence on the oxygen isotopic ratios in massive AGB stars
• Long range effects on the optical model of 6He around the Coulomb barrier
• Study of ${}^6$He+${}^{12}$C Elastic Scattering Using a Microscopic Optical Potential
• The Onset of Nuclear Structure Effects in Near-Barrier Elastic Scattering of Weakly-Bound Nuclei: ${}^6$He and ${}^6$Li Compared
• High precision ${}^{89}$Y($\alpha$,$\alpha$)${}^{89}$Y scattering at low energies
• Two-neutron overlap functions for 6He from a microscopic structure model

Cited by in corpus (5)

• Total reaction cross sections from elastic alpha-nucleus scattering angular distributions around the Coulomb barrier
• Search of systematic behavior of breakup probability in reactions with weakly bound projectiles at energies around Coulomb barrier
• Systematical study of optical potential strengths in reactions involving strongly, weakly bound and exotic nuclei on ${}^{120}$Sn
• Total reaction cross sections from ${}^{141}$141Pr($\alpha$,$\alpha$)${}^{141}$Pr elastic scattering and $\alpha$-induced reaction cross sections at low energies
• Systematic calculations of reactions with exotic and stable nuclei to establish a unified theoretical approach