论文标题
多簇模型中的低能11LI + P和11LI + D散射
Low-energy 11Li + p and 11Li + d scattering in a multicluster model
论文作者
论文摘要
在连续离散的耦合通道（CDCC）方法中研究了11LI + P和11LI + D反应，其三体描述（9LI + N + N）为11Li。我首先讨论11LI的属性，并专注于E1过渡概率到连续体。如最近的实验中所建议的那样，在低激发能量下存在1-共振，但相关的E1从基态过渡没有等效特征。在第二步中，我在CDCC框架中研究了ELAB = 66 MEV的11LI + P弹性横截面。我与实验达成了公平的一致性，并表明分手效应在很大角度上是最大的。断裂横截面显示为11LI中的1-偶极状态，但这种共振在弹性散射中的作用很小。从CDCC等效的11LI + P和11LI + N电位中，我探索了标准三体11LI +（P + N）模型中的11LI + D横截面。在小角度，实验横截面靠近卢瑟福散射横截面，而CDCC不支持。然后执行五体（9LI+N+N）+（P+N）。包括大量渠道，包括11LI和Deuteron中的分手状态代表了理论的数值挑战。尽管无法达到完整的收敛，但CDCC模型倾向于以小角度高估数据。我建议9LI + P弹性散射的测量将有助于确定更准确的光势。在11LI + D散射上实验与理论之间的当前分歧也应在其他能量上进行新的实验。
The 11Li + p and 11Li + d reactions are investigated in the Continuum Discretized Coupled Channel (CDCC) method with a three-body description (9Li + n + n) of 11Li. I first discuss the properties of 11Li, and focus on E1 transition probabilities to the continuum. The existence of a 1- resonance at low excitation energies is confirmed, but the associated E1 transition from the ground state does not have an isoscalar character, as suggested in a recent experiment. In a second step, I study the 11Li + p elastic cross section at Elab = 66 MeV in the CDCC framework. I obtain a fair agreement with experiment, and show that breakup effects are maximal at large angles. The breakup cross section is shown to be dominated by the 1- dipole state in 11Li, but the role of this resonance is minor in elastic scattering. From CDCC equivalent 11Li + p and 11Li + n potentials, I explore the 11Li + d cross section within a standard three-body 11Li +(p + n) model. At small angles, the experimental cross section is close to the Rutherford scattering cross section, which is not supported by the CDCC. A five-body (9Li+n+n)+(p+n) is then performed. Including breakup states in 11Li and in the deuteron represents a numerical challenge for theory, owing to the large number of channels. Although a full convergence could not be reached, the CDCC model tends to overestimate the data at small angles. I suggest that measurements of the 9Li + p elastic scattering would be helpful to determine more accurate optical potentials. The current disagreement between experiment and theory on 11Li + d scattering also deserves new experiments at other energies.
