FUSION CROSS SECTIONS FOR LI-7+B-11 AND BE-9+BE-9 REACTIONS AT LOW ENERGIES

摘要

The partial cross sections for the Li-7 + B-11 and Be-9 + Be-9 reactions below and above the Coulomb barrier energy have been determined from the cross sections of the characteristic gamma-rays of the residual nuclei and using the branching factor sigma(gamma)/sigma(ch) obtained from the statistical model calculations, The fusion cross sections obtained from the sum of these partial cross sections are found to be equal to the total reaction cross sections upto an energy well above the Coulomb barrier energy for the Be-9 + Be-9 reaction, For the Li-7 + B-11 reaction, however, the fusion cross sections are found to be less than the total reaction cross sections at energies not much above the Coulomb barrier. The maximum fusion cross sections for the Li-7 + B-11 and Be-9 + Be-9 reactions are found to be similar to 66% and similar to 81% of the total reaction cross sections at E(c.m.) = 2B(c) (where B-c is the Coulomb barrier energy), respectively. [References: 38]