¹²C-Carbon

 
12C has 6 protons and 6 neutrons.
12C is a stable isotope.
The mass excess of 12C is 0 with an uncertainty of ±0.


The mass was measured using Nuclear Physics and the related equations include:

Influence				 Equations

       69.2%			   11B(d,n)12Ci  1  
        30.8%			 10B(3He,p)12Ci  2  









Reference

1. J.B. Marion, T.W. Bonner, C.F. Cook (1955), (d,n) Reactions on Boron and Carbon Physical Review
100(3)
	 https://ui.adsabs.harvard.edu/abs/1955PhRv..100..847M/abstract 

2. C. P. Browne, W. E. Dorenbusch, and J. R. Erskine (1962), High-Resolution Study of the 10B(3He,p)12C Reaction
  Physical Review, 125 
  https://journals.aps.org/pr/abstract/10.1103/PhysRev.125.992