⁵⁷Fe-Iron

 
57Fe has 26 protons and 31 neutrons.
57Fe is a stable isotope.
The mass excess of 57Fe is -60182.017 with an uncertainty of ±0.268.


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

Influence				 Equations

	88.2%		           56Fe(n, γ)57Fe 1 
	6.7%		          57Fe(n, γ)58Fe 2 
	 4.1%			    57Fe-58Ni0.983 3 










Reference

1. P. Spilling, H. Gruppelaar, H.F. de Vries, A.M.J. Spits (1968) The reactions 12C(n, γ)13C and 19F(n, γ)20F
Nuclear Physics A  113(2)
 https://www.sciencedirect.com/science/article/pii/0375947468904144

2. M.A. Islam, T.J. Kennett, S.A. Kerr, W.V. Prestwich (1980) A self-consistent set of neutron separation energies
  Canadian Journal of Physics 
https://cdnsciencepub.com/doi/abs/10.1139/p80-028

3. A. Kankainen, V.-V. Elomaa, T. Eronen, D. Gorelov, J. Hakala, A. Jokinen, T. Kessler, V.S. Kolhinen, I.D. Moore, S. Rahaman, M. Reponen, J. Rissanen, A. Saastamoinen, C. Weber, J. Aysto (2010)
Mass measurements in the vicinity of the doubly magic waiting point 56Ni Physical Review C  82(3)
 https://journals.aps.org/prc/abstract/10.1103/PhysRevC.82.034311