奇特原子核^(26)S及其同中子素的电荷分布及形状因子  

Charge density distributions and Information science form factors of the exotic nucleus ^(26)S and its isotones

作　　者：王再军[1] 

机构地区：[1]天津工程师范学院数理与信息科学系,天津300222

出　　处：《天津工程师范学院学报》2007年第3期1-5,共5页Journal of Tianji University of Technology and Education

基　　金：国家自然科学基金资助项目(106750901;01255211;0535010);天津工程师范学院科研启动基金项目(KYQD05009)

摘　　要：用电子散射的Eikonal近似结合相对论平均场模型计算了奇特原子核26S及其同中子素18O2,0Ne2,2Mg2,4Si的电荷分布和形状因子,并对结果进行了详细的讨论。发现形状因子对质子数的变化非常敏感。随着质子数的增加,电荷形状因子有一个明显的上移和内移,尤其是当最外层质子占据2s1/2态时,外层质子的分布对电荷形状因子的影响尤为明显。计算结果可供实验上用电子散射研究"核芯+质子"的原子核外层质子分布和质子晕现象的参考,同时,计算结果也为平均场理论给出的核子的运动提供了新的检验。Charge density distributions and charge form factors for the exotic nuclei ^26S and its isotones ^18O, ^20Ne, ^22Mg and ^24Si are calculated by using the relativistic Eikonal approximation associated with the relativistic mean field model. It is found that the form factors are very sensitive to the changes of the proton number. The form factors have a noticeable inward and upward shift with an increasing proton number, especially when the outmost protons occupy the 2s1/2 state. The results can be useful for the study of behavior of the valence-proton wave functions for such light proton-rich nuclei as can be considered as a cluster plus proton（s）, and thus the proton-halo phenomenon. And also the results can be used as a very good test of the single-particle motion determined by the mean field model.

关 键 词：电荷形状因子 ^26S 相对论Eikonal近似 相对论平均场模型 

分 类 号：O571.2[理学—粒子物理与原子核物理]