¹²⁸Xe-Xenon

 
128Xe has 54 protons and 74 neutrons.
128Xe is a stable isotope.
The mass excess of 128Xe is -89860.53427 with an uncertainty of ±0.0052.


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

Influence				 Equations

            100%	   	             128Xe-129Xe0.992 1 
 	




 
 
 


Reference

1. A. Rischka, H. Cakir, M. Door, P. Filianin, Z. Harman, W.J. Huang, P. Indelicato, C.H. Keitel, C.M. Konig, K. Kromer, M. Muller, Y.N. Novikov, R.X. Schussler, C. Schweiger, S. Eliseev, K. Blaum (2020) 
Mass-Difference Measurements on Heavy Nuclides with an eV/c2 Accuracy in the PENTATRAP Spectrometer  Physical Review Letters 124(11)
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.124.113001