The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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proton magnetic moment to nuclear magneton ratio
 $ \mu_{\rm p}/\mu_{\rm N} = \mu_{\rm p}/(e\hbar/2m_{\rm p}) $
 Numerical value  2.792 847 344 63
 Standard uncertainty  0.000 000 000 82
  Relative standard uncertainty  2.9 x 10-10
 Concise form  2.792 847 344 63(82)    
 
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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