¹⁶⁹Tm-Thulium

 
169Tm has 69 protons and 100 neutrons.
169Tm is a stable isotope.
The mass excess of 169Tm is -61274.654 with an uncertainty of ±0.738.


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

Influence				 Equations

          65.8%	   	        169Tm(n, γ)170Tm 1 
                            12.3%	   	         170Er(α, t)171Tm-168Er()169Tm 2 
               8%	   	         169Tm35Cl-167Er37Cl 2 
            




 
 


Reference

1. R.K. Sheline, C.E. Watson, B.P. Maier, U. Gruber, R.H. Koch, O.W.B. Shult, H.T. Motz, E.T. Jurney, G.L. Struble, T. von Egidy, T. Elze, E. Bieber (1966)
Energy Levels on 170Tb  Physical Review  143(3)
https://journals.aps.org/pr/abstract/10.1103/PhysRev.143.857

2. 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

3. S. Whineray, J.D. Macdougall, W. McLatchie, H.E. Duckworth (1970) Separation and pairing energies involving isotopes of Tb, Dy, Ho, Er, Tm, Yb, Lu, and Hf
  Nuclear Physics A  151(2)
https://www.sciencedirect.com/science/article/pii/0375947470902885