¹⁹⁹Hg-Mercury

 
199Hg has 80 protons and 119 neutrons.
199Hg is a stable isotope.
The mass excess of 199Hg is -29546.066 with an uncertainty of ±0.526.


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

Influence				 Equations

        35.3%	   	          199Hg-C235Cl5 1 
          33.8%	   	           199Hg(n, γ)200Hg 2 
         17.9%	   	           199Au(β-)199Hg 3 
            	 

 






Reference

1. K.S. Kozier, K.S. Sharma, R.C. Barber, J.W. Barnard, R.J. Ellis, V.P. Derenchuk, H.E. Duckworth (1980) Precise atomic masses and mass differences for mercury
 Canadian Journal of Physics  58(9)
https://cdnsciencepub.com/doi/10.1139/p80-169

2. O.W.B. Schult, W.R. Kane, M.A.J. Mariscotti, J.M. Simic (1967) Gamma Rays from the 199Hg(n, γ)200Hg Reaction and Energy Levels in 200Hg
 Physical Review  164(4)
https://journals.aps.org/pr/abstract/10.1103/PhysRev.164.1548

3. H. Beekhuis, R.J. Van Duinen (1968) Matrix element cancellation in the beta decay of 141Ce and 199Au
 Nuclear Physics A  108(2)
https://www.sciencedirect.com/science/article/pii/0375947468900985