一个奇异中子分布结构存在的判据  

A New Criterion for Nuclei with Anomalous Neutron Distribution

作　　者：方德清[1] 沈文庆[1] 冯军[1] 蔡翔舟[1] 苏前敏[1] 张虎勇[1] 胡鹏云[1] 马余刚[1] 

机构地区：[1]中国科学院上海原子核研究所,上海201800

出　　处：《高能物理与核物理》2001年第1期44-49,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金!(19675059);上海市科学技术发展基金!(96DX14011);国家杰出青年基金!(19625513)

摘　　要：通过小液滴模型的中子皮厚度计算出的中子、质子均方根半径之差与实验的比较发现，实验提取的正常核的均方根半径之差与小液滴模型计算基本一致；有奇异中子分布结构（皮或晕）核的均方根半径之差的实验结果比小液滴模型的计算结果有异常增大．提出了一个与分离能相关的有效中子皮厚度，它能很好地反映有奇异中子分布结构核的中子皮厚度的反常增加，建议把它作为奇异中子分布结构存在的判据．Comparison of the difference between the neutron and proton RMS radii, RMS, calculated from the neutron skin thickness of the droplet model was made with the data obtained from the experimental total nuclear reaction cross section. It was found that the droplet model reproduced the RMS of normal nuclei well, but it underestimates the RMS for neutron skin and neutron halo nuclei. Since the small separation energy of last one or two neutron is one of the most important causes of the appearance of anomalous nuclear structure, an effective neutron skin thickness was used to distinguish nuclei with anomalous neutron distribution from normal nuclei, which succeeds to reproduce the abnormal increase of the neutron skin thickness for the light nuclei with neutron skin or neutron halo.

关 键 词：奇异中子分布 中子皮厚度 小液滴模型 核物理 

分 类 号：O571[理学—粒子物理与原子核物理]