¹⁸⁹Os-Osmium

 
189Os has 76 protons and 113 neutrons.
189Os is a stable isotope.
The mass excess of 189Os is -38986.802 with an uncertainty of ±0.666.


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

Influence				 Equations

           78.9%	   	           189Os(n, γ)190Os 1 
           21.1%	   	           188Os(n, γ)189Os 2 
            	 









Reference

1. R.F. Casten, M.R. MacPhail, W.R. Kane, D. Breitig, K. Schreckenbach, J.A. Cizewski (1979) Levels and γ-ray transitions in 190Os, a perturbed O(6) nucleus
 Nuclear Physics A  316(1-2)
https://www.sciencedirect.com/science/article/pii/0375947479906730

2. D. Benson,Jr., P. Kleinheinz, R.K. Sheline, E.B. Shera (1976) Nuclear spectroscopy of 189Os
 Physical Review C  14(6)
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.14.2095