¹⁵⁷Gd-Gadolinium

 
157Gd has 64 protons and 93 neutrons.
157Gd is a stable isotope.
The mass excess of 157Gd is -70823.896 with an uncertainty of ±0.977.


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

Influence				 Equations

           63.1%	   	           157Gd(n, γ)158Gd 1 
           25.1%	   	           156Gd(n, γ)155Gd 2 
               7.3%	   	           159Tb35Cl-157Gd37Cl 3 
         

 
 


 
 


Reference

1. M.A. Islam, T.J. Kennett, W.V. Prestwich (1982) Neutron separation energies of some heavy nuclides
 Physical Review C  25(6)
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.25.3184

2. L.M. Bollinger, G.E. Thomas (1970) Average-Resonance Method of Neutron-Capture γ-Ray Spectroscopy: States of 106Pd, 156Gd, 158Gd, 166Ho, and 168Er
 Physical Review C  2(5)
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.2.1951

3. R.C. Barber, R.L. Bishop, J.O. Meredith, F.C.G. Southon, P. Williams, H.E. Duckworth, P. van Rookhuyzen (1972) Precise Atomic-Mass Differences in the Region 59 ≤ Z ≤ 69
 Canadian Journal of Physics  
https://cdnsciencepub.com/doi/abs/10.1139/p72-006