Elastic scattering and total reaction cross sections for the 10B+58Ni system

DESHMUKH N. N.; GUIMARAES V.; DANIEL ABRIOLA; ANDRES ARAZI; EZEQUIEL DE BARBARÁ; OSCAR CAPURRO; MARIA ANGÉLICA CARDONA; A. N. DESHMUKH; JORGE FERNANDEZ NIELLO; JORGE GALLARDO; DANIEL HOJMAN; GUILLERMO MARTI; D. R. MENDES JR.; D. S. MONTEIRO; V. MORCELLE; ALBERTO PACHECO; DARIO PABLO RODRIGUES FERREIRA MALTEZ; V. SCARDUELLI

Maresias

Encuentro; XXXVII Brazilian Meeting on Nuclear Physics; 2014

Brazilian Physics Society

From the last decades simple elastic scattering experiments in the nuclear reactions have proved to be a successful method to provide information about the nuclear properties. It is a known fact that the near Coulomb barrier 12 16 32elastic scattering of tightly bound heavy ions such as C, O and S shows a behaviour of the energy dependence of the interacting optical potential known as Threshold Anomaly (TA), where the interacting potentials shows a rapid variation which is consistent with the dispersion relation. The name anomaly comes from the fact that the real and imaginary parts of the OP are energy independent at higher energies, but not at near barrier energies. It is also found that the net polarization potential in the scattering of weakly bound nuclei 6 7 9such as Li, Li, and Be has two components: one attractive, due to the couplings of the elastic channel with inelastic excitations and other direct reactions, and one repulsive, due to the breakup. Thus if the component is attractive the usual TA is observed and if it is repulsive it is termed as Breakup Threshold Anomaly (BTA). Thus, in order to check the dependence of the interacting potentials with respect to the energy we measured the elastic scattering angular distribution for the stable projectile 10B for which not much study has been pursued in the medium mass ranged target. The experiment for 10 B was performed using the 20 UD tandem accelerator at the TANDAR Laboratory, Argentina, which provided beam energies ranging from below to well above the Coulomb barrier: 19 to 35 MeV. The 58Ni target was 110 μg/cm2 thick and evaporated onto a 40 μg/cm2 carbon backing foil. The detection system consisted of an movable array of ten surface-barrier detectors with an angular separation of 5 degrees between adjacent detectors. Two monitor detectors (at each side of the beam) were also used for absolute normalization and below-barrier elastic scattering on a gold target was used to determine solid angle ratios. The whole set-up was mounted into 70 cm diameter scattering chamber. Currently, optical model analysis is being done to extract the optical potential parameters and reaction cross sections using the SP double folding potential which has been successfully used to describe a large variety of systems in a wide energy range, including fusion excitation functions and barrier distributions of stable and weakly bound nuclei. The detailed aspects will be presented in the Conference.