Breakup reactions at deep sub-barrier incident energies are the less investigated in the breakup of loosely-bound systems. Motivated by a recent study by Pakou et al (Phys. Rev. C 102:031601(R), 2020), we further analyse the breakup of \(^8{\mathrm{B}}\) nucleus on a lead target at deep sub-barrier incident energies. It is found that at these energies, continuum–continuum couplings enhance the breakup cross-section. These couplings are otherwise known to hinder the breakup cross-section at energies around and above the Coulomb barrier. We argue that this enhancement can in part explain the known predominance of the breakup channel over other reaction channels at deep sub-barrier energies, and that it may signal a breakup on the outgoing trajectory. The results in this paper also confirm the prediction in the reference above. Due to the astrophysical aspect of \(^8{\mathrm{B}}\) nucleus, this result could have significant implication in nuclear astrophysics.

在松散束缚系统的破裂中，对深子势垒入射能量下的破裂反应的研究较少。受 Pakou等人最近的一项研究( Phys. Rev. C 102 :031601(R), 2020) 的启发，我们进一步分析了\(^8{\mathrm{B}}\)原子核以深子势垒入射能量作用在铅靶上。发现在这些能量下，连续-连续耦合增强了分解截面。众所周知，这些耦合会阻碍库仑势垒周围和上方能量处的分解横截面。我们认为，这种增强可以部分解释在深子势垒能量下，分解通道相对于其他反应通道的已知优势，并且它可能标志着向外轨迹上的分解。本文的结果也证实了上述参考文献中的预测。由于\(^8{\mathrm{B}}\)核的天体物理学方面，该结果可能对核天体物理学具有重要意义。