Nuclear rainbow phenomena is known to occur in nuclear scattering of weakly absorbing systems such as12C +12C,12C +16O,16O +16O, and α projectiles in various target nuclei. Following theoretical predictions based on the São Paulo Potential (SPP), the16O+27Al elastic and inelastic scattering was measured at two beam energies (namely, 100 and 280 MeV) with the MAG-NEX spectrometer at the LNS, Catania [2,3]. The results show rainbow-like characteristics at the largest scattering angles, even in this system for which absorption is stronger and surface reflection tends to dominate the elastic scattering angular distribution. The coupling to the inelastic channels appears to be fundamental for the possibility of some refractive scattering, according to the theoretical calculations, which is essential for nuclear rainbow formation. This can be best appreciated in a near-far decomposition of the angular distributions. Although the cross sections are very small, the large scattering angle region can provide important information from the inner parts of the nucleus-nucleus potential, which is practically inaccessible otherwise.
Rainbow-like scattering in absorptive nuclear systems
Cappuzzello, F.;Agodi, C.;Carbone, D.;Cavallaro, M.;Cunsolo, A.;De Napoli, M.;Foti, A.;Nicolosi, D.;Tropea, S.
2013-01-01
Abstract
Nuclear rainbow phenomena is known to occur in nuclear scattering of weakly absorbing systems such as12C +12C,12C +16O,16O +16O, and α projectiles in various target nuclei. Following theoretical predictions based on the São Paulo Potential (SPP), the16O+27Al elastic and inelastic scattering was measured at two beam energies (namely, 100 and 280 MeV) with the MAG-NEX spectrometer at the LNS, Catania [2,3]. The results show rainbow-like characteristics at the largest scattering angles, even in this system for which absorption is stronger and surface reflection tends to dominate the elastic scattering angular distribution. The coupling to the inelastic channels appears to be fundamental for the possibility of some refractive scattering, according to the theoretical calculations, which is essential for nuclear rainbow formation. This can be best appreciated in a near-far decomposition of the angular distributions. Although the cross sections are very small, the large scattering angle region can provide important information from the inner parts of the nucleus-nucleus potential, which is practically inaccessible otherwise.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
