An experimental particle physicist who coauthored the 1964 discovery experiment for CP violation. A neutral kaon beam passed a two-arm magnetic spectrometer with spark chambers that reconstructed charged decay products. Evidence for two-pion decays of the long-lived component challenged conservation of the combined charge-conjugation and parity symmetry.[ref]
Evidence for the 2π Decay of the K₂⁰ Meson by James H. Christenson and others. p. 138 and Figure 1: neutral beam and two spectrometers; conclusion on two-pion decay
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