Measurements of elastic scattering for 7Be, 7Li + 9Be systems and fusion cross sections for 7Li + 9Be systemS. Verma1, J.J. Das2, A. Jhingan2, K. Kalita3, S. Barua3, K.S. Golda2, N. Madhavan2, P. Sugathan2, S. Nath2, T. Varughese2, J. Gehlot2, S. Mandal1, Ranjit1, P.K. Sahu4, B. John4, B.K. Nayak4, A. Saxena4, S.K. Datta2 and R. Singh1
1 Department of Physics and Astrophysics, University of Delhi, Delhi-110007, India
2 Inter University Accelerator Centre, New Delhi-110067, India,
3 Department of Physics, Gauhati University, Guwahati-781014, India
4 Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai-400085, India
(Received: January 31, 2007 / Published online: 8 December 2007)
Elastic scattering angular distributions have been measured for 7Be + 9Be system at Elab = 17, 19 and 21 MeV in the angular range -58°, and for 7Li + 9Be system at Elab= 15.75, 24 and 30 MeV. An optical model (OM) analysis of these data have been carried out. For the 7Li + 9Be system fusion cross sections were obtained at Elab = 15.75, 24 and 30 MeV by measuring the -evaporation spectra from the compound nucleus at backward angles. The measured -evaporation spectra were reproduced by the statistical model calculations and fusion cross sections were extracted therefrom. The ratios of the experimental fusion cross sections to the total reaction cross sections (obtained form OM analysis) were found to be rather small. This result suggests that break-up process has a strong influence on fusion process leading to a reduction in fusion cross section.
25.70.Jj - Fusion and fusion-fission reactions.
25.70.Bc - Elastic and quasielastic scattering.
25.60.Bx - Elastic scattering.
25.60.Ge - Breakup and momentum distribution.
© EDP Sciences, Springer-Verlag 2007