Experimental Test of Parity Conservation in Beta Decay.

In THE PHYSICAL REVIEW, Second series, Vol. 105, N. 4, february 15, 1957, pp. 1413-1415, the entire issue in original printed wrappers. A very fine copy, ownership inscription. Also in this volume Richard L. Garwin, Leon M. Lederman and Marcel Weinrich "Observations of the Failure of Conservation of Parity and Charge Conjugation in Meson Decays: the Magnetic Moment of the Free Muon". FIRST EDITIONS. In 1957 C. S. Wu, E. Ambler, R. W. Hayward, D. D. Hoppes, and R. P. Hudson found a clear violation of parity conservation in the beta decay of cobalt-60. As the experiment was winding down, with double-checking in progress, Wu informed Lee and Yang of their positive results, and saying the results need further examination, she asked them not to publicize the results first. However, Lee revealed the results to his Columbia colleagues on 4 January 1957 at a "Friday Lunch" gathering of the Physics Department of Columbia. Three of them, R. L. Garwin, Leon Lederman, and R. Weinrich modified an existing cyclotron experiment, and they immediately verified the parity violation. They delayed publication of their results until after Wu's group was ready, and the two papers appeared back to back in the same physics journal. ( Wikipedia ).
Ezhela, p. 153, Stroke, p. 361, 863.