DELAYED NEUTRON YIELD CALCULATIONS FOR THE NEUTRON-INDUCED FISSION OF URANIUM-235 AS A FUNCTION OF THE INCIDENT NEUTRON ENERGY.

D. R. Alexander, M. S. Krick

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Abstract

The total delayed neutron yield from **2**3**5U was calculated as a function of the energy of the neutron inducing fission. The calculations (based on fission data and fission systematics) extend from thermal to 15-MeV neutron energies. The energy-dependent delayed neutron calculations are generally consistent with experimental results from thermal to 14-MeV neutron energies. Delayed neutron yields per 10**4 fissions of 168. 7 plus or minus 16. 7, 178. 2 plus or minus 17. 2, and 88. 9 plus or minus 10. 0 were obtained at thermal, fission-spectrum, and 15-MeV neutron energies, respectively. The energy dependence of the odd-even effect in the fission charge distribution is found to partially account for the near constant yield observed below 5-MeV neutron energy, as well as the rapid decrease in yield observed at the second-change fission threshold.

Original languageEnglish (US)
Pages (from-to)627-635
Number of pages9
JournalNuclear Science and Engineering
Volume62
Issue number4
DOIs
StatePublished - Jan 1 1977

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Uranium
Neutrons
Charge distribution
Hot Temperature

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

Cite this

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title = "DELAYED NEUTRON YIELD CALCULATIONS FOR THE NEUTRON-INDUCED FISSION OF URANIUM-235 AS A FUNCTION OF THE INCIDENT NEUTRON ENERGY.",
abstract = "The total delayed neutron yield from **2**3**5U was calculated as a function of the energy of the neutron inducing fission. The calculations (based on fission data and fission systematics) extend from thermal to 15-MeV neutron energies. The energy-dependent delayed neutron calculations are generally consistent with experimental results from thermal to 14-MeV neutron energies. Delayed neutron yields per 10**4 fissions of 168. 7 plus or minus 16. 7, 178. 2 plus or minus 17. 2, and 88. 9 plus or minus 10. 0 were obtained at thermal, fission-spectrum, and 15-MeV neutron energies, respectively. The energy dependence of the odd-even effect in the fission charge distribution is found to partially account for the near constant yield observed below 5-MeV neutron energy, as well as the rapid decrease in yield observed at the second-change fission threshold.",
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AB - The total delayed neutron yield from **2**3**5U was calculated as a function of the energy of the neutron inducing fission. The calculations (based on fission data and fission systematics) extend from thermal to 15-MeV neutron energies. The energy-dependent delayed neutron calculations are generally consistent with experimental results from thermal to 14-MeV neutron energies. Delayed neutron yields per 10**4 fissions of 168. 7 plus or minus 16. 7, 178. 2 plus or minus 17. 2, and 88. 9 plus or minus 10. 0 were obtained at thermal, fission-spectrum, and 15-MeV neutron energies, respectively. The energy dependence of the odd-even effect in the fission charge distribution is found to partially account for the near constant yield observed below 5-MeV neutron energy, as well as the rapid decrease in yield observed at the second-change fission threshold.

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