133Cs-Cesium
133Cs has 55 protons and 78 neutrons.
133Cs is a stable isotope.
The mass excess of 133Cs is -88070.943 with an uncertainty of ±0.008.
The mass was measured using a Penning Trap and the related equations include:
Influence Equations
44.7% 133Cs-129Xe 1
44.6% 133Cs-132Xe 1
10.7% 133Cs-C3O6 2
Reference
1. B.J. Mount, M. Redshaw, E.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. M.P. Bradley, J.V. Porto, S. Rainville, J.K. Thompson, D.E. Pritchard (1999) Penning Trap Measurements of the Masses of 133Cs, 87,85Rb,
and 23Na with Uncertainties ≤ 0.2 ppb Physical Review Letters 83(22-29)
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.83.4510