Comparison of 120Sn(6He,6He)120Sn and 120Sn(alpha,alpha)120Sn elastic scattering and signatures of the 6He neutron halo in the optical potential
| Autor: | Mohr, P., de Faria, P. N., Lichtenth��ler, R., Pires, K. C. C., Guimar��es, V., L��pine-Szily, A., Junior, D. R. Mendes, Arazi, A., Barioni, A., Morcelle, V., Morais, M. C. |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: | |
| Popis: | 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. Comment: 13 pages, 7 figures, accepted for publication in Phys. Rev. C |
| Databáze: | OpenAIRE |
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