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Incoming links: Seth Neddermeyer
Seth Neddermeyer Created 2026-10-24 Updated 2026-11-05
Seth Neddermeyer and Carl David Anderson studied the penetrating component of cosmic rays, contributing to identification of the muon. Measurements of particle energy loss in dense absorbers revealed events that were too penetrating to fit the expected behavior of electrons at the measured momentum. Comparing track curvature and penetration supplied evidence about particle mass. The result showed why similar-looking charged tracks could belong to physically different particles.[ref]
Note on the Nature of Cosmic-Ray Particles by Seth Neddermeyer and Carl David Anderson. 1937, energy-loss and penetration comparisons; Caltech-hosted original-paper record
A physicist.[ref]
https://digital.archives.caltech.edu/collections/OralHistories/OH_Neddermeyer_S/OH_Neddermeyer_S.pdf. Independent professional biography and identity
Portrait of Seth Neddermeyer
. Manhattan Engineer District. Public domain (US Department of Energy / predecessor employee work). Source usage terms, via Wikimedia Commons. Source.