¹⁶⁸Er-Erbium

 
168Er has 68 protons and 100 neutrons.
168Er is a stable isotope.
The mass excess of 168Er is -62989.231 with an uncertainty of ±0.262.


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

Influence				 Equations

      95%	   	                168Yb-168Er 1 
          3.4%	   	           167Er(n, γ)168Er 2 
                       0.8%	   	     170Er(α, t)171Tm-168Er()169Tm 3 
            
				 


 
 


Reference

1. S. Eliseev, D. Nesterenko, K. Blaum, M. Block, C. Droese, F. Herfurth, E. Minaya-Ramirez, Yu. N. Novikov, L. Schweikhard, K. Zuber (2011)
Q values for neutrinoless double-electron capture in 96Ru, 162Er, and 168Yb  Physical Review C  83(3)
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.83.038501

2. W. Michaelis, F. Weller, U. Fanger, R. Gaeta, G. Markus, H. Ottmar, H. Schmidt (1970) Band mixing in 167Er
  Nuclear Physics A  143(2)
https://www.sciencedirect.com/science/article/pii/0375947470905610

3. D.G. Burke, J.M. Balogh (1975) Proton Separation Energies for Some Rare Earth Isotopes
 Canadian Journal of Physics  53(10)
https://cdnsciencepub.com/doi/abs/10.1139/p75-120