The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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neutron-electron magnetic moment ratio
 $\mu_{\rm n}/\mu_{\rm e}$
 Numerical value  1.040 668 82 x 10-3
 Standard uncertainty  0.000 000 25 x 10-3
  Relative standard uncertainty  2.4 x 10-7
 Concise form  1.040 668 82(25) x 10-3    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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