Actions for PROGRESS REPORT FOR OCTOBER, NOVEMBER, DECEMBER 1957 TO THE UNITED STATES ATOMIC ENERGY COMMISSION

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PROGRESS REPORT FOR OCTOBER, NOVEMBER, DECEMBER 1957 TO THE UNITED STATES ATOMIC ENERGY COMMISSION

Published
[Place of publication not identified] : [publisher not identified], 1958.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1958.
Physical Description
microopaque : positive ; 8 x 13 cm

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Summary
The operation of the Nevis neutron velocity spectrometer was substantially improved. The peak-to-valley ratio is better than 5 to 1, and the over-all intensity was increased by a factor of 10. Measurements were made on the energy dependence of the U/sup 235/ fission cross section. A more resolved plot of neutron resonances in cadmium was prepared. The investigation of fission fragment mass distribution from p-wave neutron fission in -U/sup 235/ was continued. The scintillation efficiency of an argon-nitrogen phosphor was determined. Cyclotron modifications made to obtain greater beam control are reviewed. The intermediate image pair spectrometer was assembled snd tested as an electron spectrometer. Measurements sre reported on the 1.069 and 0.569 Mev transitions in Bi/sup 207/. The average fission, capture, and inelastic scattering cross sections of U/sup 235/ were calculated using the methods of Hauser and Feshbach. A theorem of Porter's for diffusing the edge of a complex potential was generalized to the case of non-spherical wells. Several experiments are suggested for testing the timne reversal property of beta decay. A fast coincidence circuit was designed for use with the intermediate image pair spectrometer. A special photomultiplier circuit for fast-slow coincidence work was designed and satisfactorily operated. The 256-channel pulse height analyzer was altered so it can be divided into two 128-channel analyzers. An electronic divider circuit was designed for use in fission fragment mass distribution studies. An automatic control system for use in beta-ray polarization studies was also designed. The block diagram is given for a fast nonblocking linear amplifier. The apparatus used and preliminary results from electron and positron polarization experiments sre described. The half-life of O/sup 15/ decay to N/ sup 15/ was found to be 124 sec. (For preceding period . see CU-169.) (D.E.B.)
Report Numbers
CU-171
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
NSA number: NSA-12-013385
OSTI Identifier 4298348
Research organization: Columbia Univ., New York. Geores B. Pegram Lab..
Research organization: Columbia Univ., New York. Pupin Cyclotron Lab..
View MARC record | catkey: 39686168