The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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neutron g factor
 $ g_{\rm n} = 2\mu_{\rm n}/(e \hbar /2m_{\rm p}) $
 Numerical value  -3.826 085 45
 Standard uncertainty   0.000 000 90
  Relative standard uncertainty  2.4 x 10-7
 Concise form  -3.826 085 45(90)    
 
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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