The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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neutron mass in u
 $m_{\rm n}$
 Numerical value  1.008 664 916 06 u
 Standard uncertainty  0.000 000 000 40 u
  Relative standard uncertainty  4.0 x 10-10
 Concise form  1.008 664 916 06(40) u    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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