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arXiv 1604.04075physics.atom-phnucl-th
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核物理中Ne Ⅰ的$2p^53p~^2[3/2]_2 - 2p^53s~^2[3/2]^o_2$跃迁的原子参数

Atomic Parameters for the $2p^53p~^2[3/2]_2 - 2p^53s~^2[3/2]^o_2$ Transition of Ne I relevant in nuclear physics

Jiguang Li, Michel Godefroid, Jianguo Wang

摘要:

用多组态Dirac-Hartree-Fock方法计算了Ne I分子的$2p^53p~^2[3/2]_2$和$2p^53s~^2[3/2]^o_2$能级的磁偶极超精细相互作用常数和电场梯度.对连接这两个态的$λ= 614.5$ nm跃迁的同位素位移的电子因素也进行了估计。电子关联和相对论效应,包括Breit相互作用进行了详细的研究。结合最近的测量,我们提取了$^{20}$ Ne和$^{23}$ Ne的核四极矩值,其不确定度小于现有数据。基于本文计算的场位移和质量位移参数,计算了$2p^53p~^2[3/2]_2 - 2p^53s~^2[3/2]^o_2$跃迁中的同位素位移,与实验值符合得很好。然而,在这种转变中的场位移比质量位移小两到三个数量级,使得很难推断出核电荷均方半径的变化。根据我们的理论预测,我们建议,而不是使用过渡连接水平所产生的$2p^53s$配置的基态,正常的质量位移和特定的质量位移的贡献相互抵消,产生相对较小的质量位移,只有一个数量级大于相对较大的场位移,特别是对于$2p^53s~^2[1/2]^o_1 - 2p^6~^1S_0$过渡。

英文摘要:

We calculated the magnetic dipole hyperfine interaction constants and the electric field gradients of $2p^53p~^2[3/2]_2$ and $2p^53s~^2[3/2]^o_2$ levels of Ne I by using the multiconfiguration Dirac-Hartree-Fock method. The electronic factors contributing to the isotope shifts were also estimated for the $λ= 614.5$ nm transition connecting these two states. Electron correlation and relativistic effects including the Breit interaction were investigated in details. Combining with recent measurements, we extracted the nuclear quadrupole moment values for $^{20}$Ne and $^{23}$Ne with a smaller uncertainty than the current available data. Isotope shifts in the $2p^53p~^2[3/2]_2 - 2p^53s~^2[3/2]^o_2$ transition based on the present calculated field- and mass-shift parameters are in good agreement with the experimental values. However, the field shifts in this transition are two or three orders of magnitude smaller than the mass shifts, making rather difficult to deduce changes in nuclear charge mean square radii. According to our theoretical predictions, we suggest to use instead transitions connecting levels arising from the $2p^53s$ configuration to the ground state, for which the normal mass shift and specific mass shift contributions counteract each other, producing relatively small mass shifts that are only one order of magnitude larger than relatively large field shifts, especially for the $2p^53s~^2[1/2]^o_1 - 2p^6~^1S_0$ transition.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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