Abstract
IT would seem at first sight that a particle of very small mass, such as accompanies β-disintegration or electron-capture, and significant magnetic moment μ, would be very difficult to observe. According to Bethe1, it should have a fairly high ionizing power and a correspondingly small penetration into matter. Moreover, if it already possesses a charge e, the uncertainty principle should play a part in all cases where experimental evidence on μ would be sought2. However, for an ultra-relativistic particle (that is, a particle with a high ratio of kinetic mass to rest mass) special considerations come into play which may modify the generally accepted conclusions.
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References
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THIBAUD, J. Behaviour of a Particle of Very Small Mass in a Magnetic Field. Nature 162, 329 (1948). https://doi.org/10.1038/162329a0
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DOI: https://doi.org/10.1038/162329a0
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