Inclusiveα-production cross section for theLi6+Zr90system at energies near the fusion barrier

Abstract

Inclusive ($\mathrm{direct}+\mathrm{compound}$) $\ensuremath{\alpha}$ production for the $^{6}\mathrm{Li}+^{90}\mathrm{Zr}$ system is measured at near barrier energies, namely, $15,17,19,21,25$, and 30 MeV. The data are treated in the statistical model and distorted-wave Born approximation framework to disentangle the degree of competition between direct and compound reaction channels. A substantial contribution from the compound reaction channels is obtained but the direct reaction channels are found to be the dominant mechanism for $\ensuremath{\alpha}$ production at these energies. Estimation of the breakup and transfer reaction around the barrier shows that the latter is the dominant channel. Universal behavior of the $\ensuremath{\alpha}$-production cross section is observed over a large range of target nuclei.