Retrieving "Cobalt 60" from the archives

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1. Parity Inversion

   Linked via "Cobalt-60"

   Wu Experiment and Observation
   The definitive evidence for parity non-conservation came from the 1956 experiment conducted by Chien-Shiung Wu and collaborators, involving the beta decay of Cobalt-60 ($\text{}^{60}\text{Co}$) nuclei polarized in a strong magnetic field at cryogenic temperatures [2].
   The experiment measured the asymmetry in the emission direction of beta particles relative to the nuclear spin axis. If parity were cons…

2. Parity Reversal

   Linked via "Cobalt-60"

   Parity Violation in the Weak Interaction
   The expectation that parity is conserved in all fundamental forces was a bedrock assumption until the groundbreaking discovery in 1956 concerning the weak nuclear force. Experiments observing the beta decay of Cobalt-60 nuclei demonstrated a distinct preference for the emitted electrons to possess a specific helicity, directly violating the symmetry under spatial inversion.
   The experimental setup involved cooling $^{60}\text{C…