¹⁸⁰Hf-Hafnium

 
180Hf has 72 protons and 108 neutrons.
180Hf is a stable isotope.
The mass excess of 180Hf is -49779.476 with an uncertainty of ±1.421.


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

Influence				 Equations

          83.4%	   	            179Hf(n, γ)180Hf 1 
      16.6%	   	            180W-180Hf 2 
             
			 	 








Reference

1. D.L. Bushnell, D.J. Buss, R.K. Smither (1974) 180Hf energy levels deduced from thermal and average resonance neutron-capture γ-ray spectra
 Physical Review C  10(6)
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.10.2483

2. C. Droese, K. Blaum, M. Block, S. Eliseev, F. Herfurth, E. Minaya-Ramirez, Yu. N. Novikov, L. Schweikhard, V.M. Shabaev, I.I. Tupitsyn, S. Wycech, K. Zuber, N.A. Zubov (2012)
Probing the nuclide 180W for neutrinoless double-electron capture exploration  Nuclear Physics A  875
https://www.sciencedirect.com/science/article/pii/S0375947411006646