论文标题
系统研究各种高阶过程在弱构成弹丸中分解中的作用
Systematic study on the role of various higher-order processes in the breakup of weakly-bound projectiles
论文作者
论文摘要
基于仅限于电偶极子（$ e1 $）的一阶库仑解离的虚拟光子理论（VPT）已成功地用于解释多种情况的分手数据。我们的目的是研究VPT中忽略的各种高阶过程的作用，例如核破裂，核和库仑振幅之间的干扰以及多步分解过程，主要是由于强烈的连续性连续性 - 基因构耦合在中间和较高入射的能量的两种体化射击中的分解。出于数值计算的目的，我们采用了三体连续二氧化耦合通道（CDCC）反应模型的Eikonal版本。我们的$^{11} $ BE和$^{17} $ f在$^{208} $ pb target上分解的结果在100、250和520 meV/a上显示出核破裂贡献的重要性，以及在多步骤过程中的重要作用。发现对核心中性弹丸的库仑破裂的多步效应可忽略不计，而对于核心 - 普罗顿弹丸很重要。还发现库仑 - 核干涉（CNI）效应不可忽略。从数量上讲，发现由于核破裂引起的多步效应取决于核心目标和核子 - 目标核电位的能量依赖性的入射能。发现核破裂成分，CNI效应和多步分解过程都不可忽略；因此，在VPT中采用的假设对分解横截面的准确描述是无效的。
The virtual photon theory (VPT), which is based on first-order Coulomb dissociation restricted to the electric dipole ($E1$), has been successfully used to explain the breakup data for several cases. Our aim is to study the role of various higher-order processes that are ignored in the VPT, such as the nuclear breakup, interference between nuclear and Coulomb amplitudes, and multistep breakup processes mainly due to strong continuum-continuum couplings in the breakup of two-body projectiles on a heavy target at both intermediate and higher incident energies. For the purpose of numerical calculations, we employed eikonal version of three-body continuum-discretized coupled-channels (CDCC) reaction model. Our results for the breakup of $^{11}$Be and $^{17}$F on $^{208}$Pb target at 100, 250, and 520 MeV/A, show the importance of nuclear breakup contribution, and its significant role in the multistep processes. The multistep effect on Coulomb breakup for core-neutron projectile was found to be negligible, whereas it was important for core-proton projectile. Coulomb-nuclear interference (CNI) effect was also found to be non-negligible. Quantitatively, the multistep effects due to the nuclear breakup was found to depend on the incident energy through the energy dependence of the core-target and nucleon-target nuclear potentials. The nuclear breakup component, the CNI effect, and the multistep breakup processes are all found to be non-negligible; hence, the assumptions adopted in the VPT for the accurate description of breakup cross sections are not valid.
