The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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neutron-proton mass difference energy equivalent in MeV
 $(m_{\rm n}-m_{\rm p})c^2$
 Numerical value  1.293 332 36 MeV
 Standard uncertainty  0.000 000 46 MeV
  Relative standard uncertainty  3.5 x 10-7
 Concise form  1.293 332 36(46) MeV    
 
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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