The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron magnetic moment to nuclear magneton ratio
$\mu_{\rm e}/\mu_{\rm N}$
 Value  -1838.281 972 34
 Standard uncertainty      0.000 000 17
  Relative standard uncertainty   9.5 x 10-11
 Concise form  -1838.281 972 34(17)    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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