Status of the new muonic helium atom HFS measurements at J-PARC MUSE
Status of the new muonic helium atom HFS measurements at J-PARC MUSE
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DOI：
10.1088/1742-6596/2462/1/012023
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
P. Strasser;S. Fukumura;T. Ino;R. Iwai;S. Kanda;S. Kawamura;M. Kitaguchi;S. Nishimura;T. O
中科院分区：
文献类型：
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作者：
P. Strasser;S. Fukumura;T. Ino;R. Iwai;S. Kanda;S. Kawamura;M. Kitaguchi;S. Nishimura;T. O
介子氦原子超精细结构（HFS）的测量是检验三体原子系统理论和束缚态量子电动力学（QED）理论以及确定负介子磁矩和质量基本常数的灵敏工具。世界上最强烈的脉冲负μ子束在J-PARC MUSE带来了一个机会，通过比较正负μ子的磁矩和质量来改进以前的测量和进一步测试CPT不变性。d线的测试测量目前正在使用博物馆零场设备进行。最初的结果已经比上世纪80年代的测量结果更加精确。同时，研究了利用自旋交换光泵浦（SEOP）技术对μ氦原子进行再极化以改善HFS测量的新实验方法。如果成功，这将大大提高测量精度。
Measurements of the muonic helium atom hyperfine structure (HFS) are a sensitive tool to test the theory of three-body atomic systems and bound-state quantum electrodynamics (QED) and to determine fundamental constants of the negative muon magnetic moment and mass. The world’s most intense pulsed negative muon beam at J-PARC MUSE brings an opportunity to improve previous measurements and test further CPT invariance by comparing the magnetic moments and masses of positive and negative muons. Test measurements at D-line are now in progress utilizing MuSEUM apparatus at zero field. The first results already have better accuracy than previous measurements in the 1980s. Also, the investigation of a new experimental approach to improve HFS measurements by repolarizing muonic helium atoms using a spin-exchange optical pumping (SEOP) technique was started. If successful, this would drastically improve the measurement accuracy.