831 resultados para FISSION NEUTRONS


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The measurement of 28O-Mev neutron cross sections of various nuclei is described. The neutron beam used results from 340-Mev protons in the 184-in. cyclotron striking a 2-in. Be target. The neutron detector consists of a double coincidence anthracene scintillation counter telescope which counts recoil protons scattered at 15 deg from a paraffin cylinder placed in the collimated neutron beam. A 2-in. Cu absorber placed between the counters assures that only protons of energy greater than 250 Mev are counted. The cross sections for all nuclei measured from Li to Pb are smaller than the corresponding cross sections measured at 90 Mev by factors between 0.5 and 0.6.

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Work performed at the Argonne National Laboratory.

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Work performed at the Argonne National Laboratory.

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"May 1960."

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"Prepared for Presentation at the Hearings on Fallout Before the Joint Committee on Atomic Energy, May 5-8, 1959."

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"August 23, 1957."

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"Contract No. AT(40-1)-1399."

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"Office of Isotopes Development, U.S. Atomic Energy Commission."

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An annotated bibliography of 190 items is presented, covering AEC report literature and selected references from the open literature on biological effects of neutrons, gamma radiations, and combinations of both.

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"Chemistry--Separation process for plutonium and uranium."