The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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neutron-electron mass ratio
 $m_{\rm n}/m_{\rm e}$
 Numerical value  1838.683 662 00
 Standard uncertainty     0.000 000 74
  Relative standard uncertainty  4.0 x 10-10
 Concise form  1838.683 662 00(74)    
 
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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