The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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reduced neutron Compton wavelength
 $\lbar_{\rm C,n}$
 Numerical value  2.100 194 1552 x 10-16 m
 Standard uncertainty  0.000 000 0012 x 10-16 m
  Relative standard uncertainty  5.7 x 10-10
 Concise form  2.100 194 1552(12) x 10-16 m    
 
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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