Precise measurement of the hyperfine splitting in muonium with a high intensity pulsed muon beam at J-PARC
Precise measurement of the hyperfine splitting in muonium with a high intensity pulsed muon beam at J-PARC
复制标题
J-PARC 使用高强度脉冲 μ 介子束精确测量 μ 介子的超精细分裂
DOI：
10.1088/1742-6596/2462/1/012019
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Torii H A
中科院分区：
文献类型：
--
作者：
Iwai R;Abe M;Fukumura S;Hiraishi M;Kanda S;Kawamura S;Nishimura S;Okabe H;Sasaki K;Strasser P;Shimomura K;Tada H;Teshima N;Torii H A
在J-PARC，MuSEUM（Muonium Spectroscopy Experiment Using Microwave）合作旨在精确测量由μ子和电子自旋产生的μ原子的基态超精细分裂。脉冲μ介子束在氪气室中停止以形成μ 鎓原子。自旋态的跃迁是用微波腔诱导的，然后用正电子计数器测量。在之前成功地进行了近零磁场测量之后，我们目前正在计划通过测量两个塞曼分裂子能级来进行2.9 T磁场测量，以便增加统计数据，使我们能够更精确地确定跃迁频率下降到1.01ppb。此外，正在设计一种具有独特几何形状的新微波腔，以便在未来更强的2.9 T场下进行测量。
At J-PARC, the MuSEUM (Muonium Spectroscopy Experiment Using Microwave) collaboration aims to precisely measure the ground-state hyperfine splitting of muonium atoms arising from the muon and electron spins. The pulsed muon beam is stopped in a krypton gas cell to form muonium atoms. The transitions of spin states are induced with a microwave cavity, which are then measured by positron counters. After the previously performed successful measurements with a nearly-zero magnetic field, we are currently planning a measurement with the 2.9 T magnetic field by measuring two Zeeman-split sub-levels, so that increased statistics will allow us to more precisely determine the transition frequency down to∼ 1ppb. Moreover, a new microwave cavity with a unique geometry is being designed to perform the measurement at an even stronger field of 2.9 T in the future.