Elastic Scattering of 7Li + 27Al at Several Angles in the 7 – 11 MeV Energy Range

D. ABRIOLA; P. CARNELLI; A. ARAZI; J. M. FIGUEIRA; O. A. CAPURRO; M. A. CARDONA; J. O. FERNÁNDEZ NIELLO; D. HOJMAN; L. FIMIANI; P. GRINBERG; D. MARTÍNEZ HEIMANN; G. V. MARTÍ; A. E. NEGRI; A. J. PACHECO

University of Cambridge, UK

Conferencia; 19th International Conference on Ion Beam Analysis; 2009

Elastic cross sections for the 7Li + 27Al system were measured at laboratory energies between 7 and 11 MeV in steps of 0.25 MeV, and angles between 135º and 170º in steps of 5º. Excitation functions for the elastic scattering were measured using an array of eight Si surface-barrier detectors whereas a solid-state telescope was used to estimate and subtract background from other reactions. Contamination from a particles arising from the 7Li breakup process at Elab > 10 MeV makes the use of these energies inadvisable for RBS applications. The present results are compared with previous data obtained at 165º (Elab < 6 MeV), 140º and 170º (Elab < 8 MeV). The experimental data were analyzed in terms of the Optical Model. Two different energy-independent potentials were found. These optical potentials allow an interpolation with physical meaning to other energies and scattering angles. The experimental cross sections will be uploaded to the IBANDL database.