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

P. MOHR; P.N. DE FARIA; R. LICHTENTHALER; K. C. C. PIRES; V. GUIMARÃES; A. LÉPINE-SZILY; D.R. MENDEZ JR.; A. ARAZI; A. BARIONI; V. MORCELLE; M. C. MORAIS

PHYS. REV. - C

AMER PHYSICAL SOC

Año: 2010 vol. 82 p. 4460601 - 4460611

0556-2813

Cross sections of 120Sn(α,α)120Sn elastic scattering have been extracted from the α-particle-beam contaminationof a recent 120Sn(6He,6He)120Sn experiment. Both reactions are analyzed using systematic double-foldingpotentials in the real part and smoothly varying Woods-Saxon potentials in the imaginary part. The potentialextracted from the 120Sn(6He,6He)120Sn data may be used as the basis for the construction of a simple global 6Heoptical potential. The comparison of the 6He and α data shows that the halo nature of the 6He nucleus leads toa clear signature in the reflexion coefficients eta-L: The relevant angular momenta L with eta-L >> 0 and eta L << 1 areshifted to larger L with a broader distribution. This signature is not present in the α-scattering data and can thusbe used as a new criterion for the definition of a halo nucleus.