GAMMA RAYS ASSOCIATED WITH FISSION

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Measurements of the energy spectra and time distribution of the fission-associated gamma rays are described. New data for thermal neutron-induced fission in U/sup 235/ is presented covering the energy range between 0.3 and 8.0 Mev. Gamma-ray energy analysis was carried out with a multiple-crystal scintillation spectrometer employing either Compton scattering of pair production to give unique pulse-height response. The importance of unique spectrometer response is explained. The gamma-ray spectrometer was operated in coincidence with a spiral-wound fission chamber by the use of a four-fold coincidence circuit having a resolving time of 6 x 10/sup -8/ sec. Spectral measurements for delayed ... continued below

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Pages: 12

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Maienschein, F.C.; Peelle, R.W.; Zobel, W. & Love, T.A. October 31, 1958.

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Description

Measurements of the energy spectra and time distribution of the fission-associated gamma rays are described. New data for thermal neutron-induced fission in U/sup 235/ is presented covering the energy range between 0.3 and 8.0 Mev. Gamma-ray energy analysis was carried out with a multiple-crystal scintillation spectrometer employing either Compton scattering of pair production to give unique pulse-height response. The importance of unique spectrometer response is explained. The gamma-ray spectrometer was operated in coincidence with a spiral-wound fission chamber by the use of a four-fold coincidence circuit having a resolving time of 6 x 10/sup -8/ sec. Spectral measurements for delayed fission radiation were obtained with a similar gamma-ray spectrometer. Energy distributions from 0.3 to 5.4 Mev are presented for ten delay times between 1.7 and 1550 sec. Gamma radiation delayed between 6 x 10/sup -8/ and 3 x 10/sup -6/ sec after fission was observed following thermal-neutron induced fission. This radiation appeared to be about 6% as intense as the prompt radiation. No gamma-rays in the range from 3 to 7 x 10/sup -6/ sec were observed within limitations imposed by random backgrounds. No measurements were reported in the time range between 7 x 10/sup 6/ sec and 1 sec. New data presented include time time dependence of the gamma radiation delayed from 1 to 1600 sec after fission, divided into six gamma-ray energy intervals betwveen 0.28 and 5.0 Mev. These data are in good agreement with the energy-spectral data. Comparisons are also made with data available from gross fission-product photoneutron yields and chemically separated fission-product nuclides. (auth)

Physical Description

Pages: 12

Source

  • Other Information: Prepared for the Second U.N. International Conference on the Peaceful Uses of Atomic Energy, 1958. Orig. Receipt Date: 31-DEC-58

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  • Report No.: A/CONF.15/P/670
  • Grant Number: None
  • DOI: 10.2172/4325517 | External Link
  • Office of Scientific & Technical Information Report Number: 4325517
  • Archival Resource Key: ark:/67531/metadc1022562

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • October 31, 1958

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

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  • Feb. 1, 2018, 6:17 p.m.

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Maienschein, F.C.; Peelle, R.W.; Zobel, W. & Love, T.A. GAMMA RAYS ASSOCIATED WITH FISSION, report, October 31, 1958; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1022562/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.