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reading:the_47_years_of_muon_g-2 [2020/09/18 08:43] – [3 Spin motion] Ce Zhangreading:the_47_years_of_muon_g-2 [2020/09/18 08:58] (current) Ce Zhang
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 $$ $$
  
-该进动频率已经在磁场中被测量多次。磁场本身则可以由测量质子的自旋频率$\omega_p$来确定。比值$\lambda=\omega_s/\omega_p = \mu_\mu/\mu_p$。+该进动频率已经在磁场中被测量多次。磁场本身则可以由测量质子的自旋频率$\omega_p$来确定。比值$\lambda=\omega_s/\omega_p = \mu_\mu/\mu_p$也因此可以被确定。 
 +当然,$\lambda=\omega_s/\omega_p$也可以由muonium的超精细结构来确定
  
 ===3.2 Precession in flight=== ===3.2 Precession in flight===
 +
 +在低速下,电子(muon)在磁场中的轨道旋转频率$\omega_c=eB/mc$和几乎和其自旋的旋转频率是一样的。低速下,自旋的频率不受运动影响。两个频率之差反应了反常磁矩
 +
 +$$
 +\omega_a \equiv  \omega_s - \omega_c  = (g/2)(eB/mc) - (eB/mc) = a(eB/mc)
 +$$
 +
 +__Q: 为什么直接测量a比直接测量g(并和2比较)更精确?__
 +
  
 ==3.2.1  Magnetic field only== ==3.2.1  Magnetic field only==