Zinn,Walter

Physicist with Wigner s group Zinn, Walter H. 

The cylinder of beryllium, which Walter Zinn thought a strange and unique object and took for proof of Szilard s magic ways, arrived on February 18. The same day Szilard heard from Teller about significant work in... 

Between September 15 and November 15 Anderson, Walter Zinn and... 

Greenewalt called Samuel Allison in Chicago on Friday afternoon. Allison passed the bad news to Walter Zitm at Argonne, the laboratory in the forest south of Chicago where CP-1 was meant to be housed and where several piles now operated. Zinn had just shut down CP-3, a shielded six-foot tank filled with 6.5 tons of heavy water in which 121 aluminum-clad uranium rods were suspended. Disbelieving, Zitm started the 300-kilowatt reactor up again and ran it at full power for twelve hours. It was primarily a research instrument and it had never been run so long at full power before. He found the xenon efiect. Laborious calculations at Hanford over the next three days confirmed it. 

Meitner passed word of this discovery to her nephew, Otto Frisch, a physicist working at Niels Bohr s institute in Copenhagen. Frisch repeated the experiment, verifying Hahn s observations, and found that tremendous energies were involved. In lanuary 1939, Meitner and Frisch published a short article describing the reaction. In March 1939, Leo Szilard and Walter Zinn at Columbia University discovered that more neutrons are produced than are used in each fission. As we have seen, this result allows a chain reaction to occur. 

American scientists became active participants in attempts to confirm and extend Hahn s and Strassmann s results, which dominated nuclear physics in 1939. Bohr and John A. Wheeler advanced the theory of fission in important theoretical work done at Princeton University, while Fermi and Salard collaborated with Walter H. Zinn and... 

Knemeyer, Michael A., Walter Zinn, and Cuneyt Eroglu. Proactive Planning for Catastrophic Events in Supply Chains. Journal of Operations Management Tl, no. 2 (2009) 141-153. 

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