The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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neutron Compton wavelength over 2 pi
$\lbar_{\rm C,n}$
 Value  0.210 019 415 36 x 10-15 m
 Standard uncertainty  0.000 000 000 14 x 10-15 m
  Relative standard uncertainty   6.7 x 10-10
 Concise form  0.210 019 415 36(14) x 10-15 m    
 
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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