alpha clustering in the O-18,O-16+C-13,C-12 fusion-evaporation reactions

摘要

alpha clustering plays an important role in studying not only nuclear structures but also nuclear reactions of light nuclei. In this work, we study the O-18,O-16 + C-13,C-12 fusion-evaporation reactions at the energy near the Coulomb barrier using a modified statistical model with the alpha-cluster structures taken into consideration explicitly in the nuclear level densities. This modified statistical model reproduces successfully the experimentally measured alpha-emission cross sections, and thus provides a possible way to resolve the underestimation discrepancy of the alpha emission in the original statistical model. Moreover, the modified statistical model could also describe well the angular distributions of the evaporation residues and the energy spectra of the emitted alpha particles. Therefore, our work shows that alpha-cluster structures could play an important role in the fusion-evaporation reactions of light ions, and the modified statistical model is a reliable theoretical model for these physical processes. (C) 2019 The Authors. Published by Elsevier B.V.