原子核电荷半径的研究  

Study of nuclear charge radius

作　　者：曹颖逾 郭建友[1] Cao Ying-Yu;Guo Jian-You(School of Physics and Materials Science,Anhui University,Hefei 230601,China)

机构地区：[1]安徽大学物理与材料科学学院,合肥230601

出　　处：《物理学报》2020年第16期26-32,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11575002)资助的课题.

摘　　要：结合已有的原子核半径的实验数据,对先前的核电荷半径公式进行验证和探讨.比较单参数核电荷半径公式,验证了Z1/3律公式要优于A1/3律公式.对两参数公式和三参数公式进行验证,得到两参数和三参数公式要优于单参数公式.考虑到原子核电四极矩与形变的关系,在原有的三参数公式中加入电四极矩因子项,得出核电荷半径新公式.拟合该公式发现核电荷半径理论值与实验值符合较好.再考虑总自旋与电四极矩的关系,求出内禀电四极矩,代入公式中进行拟合,均方根偏差进一步下降.最后加入能反映奇偶摆动现象的δ项,用公式得到的均方根偏差为0.369 fm,较好地反映出了形变与核电荷半径的关系.Based on the existing experimental data of nuclear radius,the previous formula of nuclear charge radius is verified and discussed.Comparing the formula of the single-parameter nuclear charge radius,it is proved that the formula of law is better than the formula of law.We refitted the two-parameter formula and the three-parameter formula that have been proposed and confirmed that the two-parameter and three-parameter formula fit better than the single-parameter formula.It is shown that show that the deformation plays a key role in the nuclear charge radius.The electric quadrupole moment is an important physical quantity representing the properties of the nucleus.Its appearance indicates the deviation from spherical symmetry and also reflects the size of the nuclear deformation.The electric quadrupole moment is also one of the basic observations to understand the distribution of matter within the nucleus,to examine the nuclear model,and to observe nucleon-nuclear interactions.Taking into account the relationship between the nuclear quadrupole moment and the deformation,the electric quadrupole moment factor is added to the original three-parameter formula to obtain a new formula for the nuclear charge radius.Fitting the four-parameter formula,it is found that the theoretical value of the nuclear charge radius is in good agreement with the experimental value,the root-mean-square deviation is 0.0397 fm.Considering the relationship between the total spin and the electric quadrupole moment,the intrinsic electric quadrupole moment is obtained and brought into the formula for fitting,and the root-mean-square deviation further decreases,the root-mean-square deviation is 0.0372 fm.Finally,considering the universality of odd-even staggering,we add the term that can reflect the odd and even oscillation phenomenon,and the root-mean-square deviation obtained by the formula is 0.369 fm,which better reflects the relationship between the deformation and the nuclear charge radius.Compared with the formulas already proposed,the new

关 键 词：核电荷半径 电四极矩 自旋 

分 类 号：O571[理学—粒子物理与原子核物理]