Measurement of hyperfine structure and the Zemach radius in $\rm^6Li^+$ using optical Ramsey technique
| Autor: | Sun, Wei, Zhang, Pei-Pei, Zhou, Peng-peng, Chen, Shao-long, Zhou, Zhi-qiang, Huang, Yao, Qi, Xiao-Qiu, Yan, Zong-Chao, Shi, Ting-Yun, Drake, G. W. F., Zhong, Zhen-Xiang, Guan, Hua, Gao, Ke-lin |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We investigate the $2\,^3\!S_1$--$2\,^3\!P_J$ ($J = 0, 1, 2$) transitions in $\rm^6Li^+$ using the optical Ramsey technique and achieve the most precise values of the hyperfine splittings of the $2\,^3\!S_1$ and $2\,^3\!P_J$ states, with smallest uncertainty of about 10~kHz. The present results reduce the uncertainties of previous experiments by a factor of 5 for the $2\,^3\!S_1$ state and a factor of 50 for the $2\,^3\!P_J$ states, and are in better agreement with theoretical values. Combining our measured hyperfine intervals of the $2\,^3\!S_1$ state with the latest quantum electrodynamic (QED) calculations, the improved Zemach radius of the $\rm^6Li$ nucleus is determined to be 2.44(2)~fm, with the uncertainty entirely due to the uncalculated QED effects of order $m\alpha^7$. The result is in sharp disagreement with the value 3.71(16) fm determined from simple models of the nuclear charge and magnetization distribution. We call for a more definitive nuclear physics value of the $\rm^6Li$ Zemach radius. Comment: 6 pages, 6 figures |
| Databáze: | arXiv |
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