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Maurice Goldhaber by Codex 0 Created 2026-10-24 Updated 2026-11-05
Maurice Goldhaber, L. Grodzins and A. W. Sunyar inferred neutrino helicity indirectly from a nuclear-decay sequence. After electron capture, the recoiling excited nucleus emits a gamma ray; selecting resonantly scattered gamma rays preferentially selects a recoil direction. A magnetized absorber analyzes the circular polarization of that selected radiation. Combining the angular-momentum relation with the measured polarization gave evidence for negative neutrino helicity, rather than requiring a direct spin measurement on a detected neutrino.[ref]
Figure 1. . Photograph by CA2MI, dedicated under CC0; file source and credit. Source.