The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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electron to shielded helion magnetic moment ratio
 $\mu_{\rm e}/\mu^\prime_{\rm h}$
 Numerical value  864.058 239 86
 Standard uncertainty    0.000 000 70
  Relative standard uncertainty  8.1 x 10-10
 Concise form  864.058 239 86(70)    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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