39K-Potassium
39K has 19 protons and 20 neutrons.
39K is a stable isotope.
The mass excess of 39K is -33807.19535 with an uncertainty of ±0.00456.
The mass was measured using a Penning Trap and Nuclear Physics and the related equations include:
Influence Equations
99.8% 39K-40Ar 1
0.1% 39K(n, γ)40K 2
Reference
1. Brianna J. Mount, Matthew Redshaw, and Edmund G. Myers (2010) Atomic masses of 6Li, 23Na, 39,41K, 85,87Rb, and 133Cs
Physical Review A 82(4)
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.82.042513
2. T. Von Egidy, H. Daniel, P. Hungerford, H.H. Schmidt, K.P. Lieb, B. Krusche, S.A. Kerr, G. Barreau, H.G. Borner, R. Brissot, C. Hofmeyr, R. Rascher (1984)
Levels and gamma transitions of 40K studied by neutron capture Journal of Physics G: Nuclear Physics 10(2)
https://iopscience.iop.org/article/10.1088/0305-4616/10/2/013