The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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alpha particle relative atomic mass
 $A_{\rm r}(\alpha)$
 Numerical value  4.001 506 179 127
 Standard uncertainty  0.000 000 000 063
  Relative standard uncertainty  1.6 x 10-11
 Concise form  4.001 506 179 127(63)    
 
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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