arXiv 2006.015482020-06-02nucl-th

多团簇模型中的低能~（11）Li + p和~（11）Li + d散射

Low-energy 11Li + p and 11Li + d scattering in a multicluster model

Pierre Descouvemont

备注：: 12 pages, 10 figures, accepted at Phys. Rev. C
DOI：: 10.1103/PhysRevC.101.064611

摘要：

采用连续离散耦合道（CDCC）方法，采用三体描述（9 Li + n + n）对11 Li + p和11 Li + d反应进行了研究.本文首先讨论了11 Li的性质，重点讨论了E1跃迁到连续谱的几率。在低激发能的1-共振的存在被证实，但从基态相关的E1过渡不具有isoscillatory字符，建议在最近的实验。在第二步中，我研究了11 Li + p弹性截面在Elab = 66 MeV的CDCC框架。我获得了一个公平的协议与实验，并表明破碎效果是最大的大角度。破裂截面示出的11锂的1-偶极子状态为主，但这种共振的作用是轻微的弹性散射。从CDCC等效的11 Li + p和11 Li + n势出发，在一个标准的三体11 Li+（p + n）模型中，研究了11 Li + d的截面。在小角度下，实验截面接近卢瑟福散射截面，这是不支持的CDCC。然后进行五体（9 Li +n+n）+（p+n）。由于通道数量众多，将11 Li和氘核中的分裂态纳入其中对理论来说是一个数值挑战。虽然不能达到完全收敛，但CDCC模型倾向于高估小角度的数据。我建议，9 Li + p弹性散射的测量将有助于确定更准确的光学势。目前关于11 Li + d散射的实验和理论之间的分歧也值得在其他能量下进行新的实验。

英文摘要：

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.

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