Study of Neutron Skin/Halo Structures Utilizing the Asymmetry in Nucleon Scatterings

从系统而精确的反应截面(σ_R)测量中发现，用修正的光学极限格劳伯计算(包括多次散射和费米运动效应)可以很好地再现中能σ_R。基于这种成功的计算σ_R的方法，我们尝试利用σ_R在这些能量下对稀释密度的高灵敏度以及核子散射的不对称性来研究核表面结构。首先，用~3H和~3He束流获得了重靶的精确σ_R数据以研究中子皮。其次，利用聚乙烯质子靶，研究了晕的组成(质子或中子)。结果，与修正的光学极限计算结果相比较，清楚地显示了^8B和^&lt；11&gt；Be的晕组分，为更详细地理解核表面结构提供了一条途径。

From a systematic and precise measurement of reaction cross sections (σ_R), it has been revealed that σ_R at intermediate energies can be reproduced very well by an optical-limit Glauber calculation modified to include the multiple scattering and the Fermi-motion efficts. Based on this successful method to calculate σ_R, we tried to study the nuclear surface structure utilizing the high sensitivity of σ_R at these energies to dilute densities and also the asymmetry of nucleon scatterings. First, using 3H and 3He beams, precise σ_R data on heavy targets have been obtained to investigate the neutron skin Next, using polyethylene proton targets, the constituent (proton or neutron) of halo has been studied. As a result, comparing the present experimental data with the modified optical-limit calculations, the constituents of the halos in ^8B and ^<11>Be have been clearly shown., which shed a light on a way to understand the nuclear surface structure in detail.