The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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alpha particle mass energy equivalent
 $m_{\rm \alpha}c^2$
 Numerical value  5.971 920 1914 x 10-10 J
 Standard uncertainty  0.000 000 0018 x 10-10 J
  Relative standard uncertainty  3.0 x 10-10
 Concise form  5.971 920 1914(18) x 10-10 J    
 
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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