The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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neutron-proton mass difference energy equivalent
 $(m_{\rm n}-m_{\rm p})c^2$
 Value  2.072 146 37 x 10-13 J
 Standard uncertainty  0.000 000 76 x 10-13 J
  Relative standard uncertainty   3.7 x 10-7
 Concise form  2.072 146 37(76) x 10-13 J   
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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