3He-Helium 3


3He has 2 protons and 1 neutron.
3He is a stable isotope.
The mass excess of 3He is 14931.21888 with an uncertainty of ±0.00006.


The mass was measured using a Penning Trap and the related equations include:
Influence				Equations 
 61.8%				3He-HD1  
  25.8%				  H3-3He	2  
 12.4%				 3H-3He1  





Reference

1. Moreland, P.E., Bainbridge, K.T. (1964).
	Direct Determination of the 3H—3He Mass Difference. In: Johnson, W.H. (eds) Nuclidic Masses.
	Springer, Vienna. https://doi.org/10.1007/978-3-7091-5556-1_37
	 https://link.springer.com/chapter/10.1007/978-3-7091-5556-1_37

2. D. Hagena, G. Werth(1991)
	Measurement of the 3He/H2 Mass Ratio EPL  15(491)
	 https://iopscience.iop.org/article/10.1209/0295-5075/15/5/004