Prompt fission neutron spectra and average prompt neutron multiplicities

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We present a new method for calculating the prompt fission neutron spectrum N(E) and average prompt neutron multiplicity anti nu/sub p/ as functions of the fissioning nucleus and its excitation energy. The method is based on standard nuclear evaporation theory and takes into account (1) the motion of the fission fragments, (2) the distribution of fission-fragment residual nuclear temperature, (3) the energy dependence of the cross section sigma/sub c/ for the inverse process of compound-nucleus formation, and (4) the possibility of multiple-chance fission. We use a triangular distribution in residual nuclear temperature based on the Fermi-gas model. This leads to ... continued below

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Pages: 36

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Madland, D.G. & Nix, J.R. January 1, 1983.

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Description

We present a new method for calculating the prompt fission neutron spectrum N(E) and average prompt neutron multiplicity anti nu/sub p/ as functions of the fissioning nucleus and its excitation energy. The method is based on standard nuclear evaporation theory and takes into account (1) the motion of the fission fragments, (2) the distribution of fission-fragment residual nuclear temperature, (3) the energy dependence of the cross section sigma/sub c/ for the inverse process of compound-nucleus formation, and (4) the possibility of multiple-chance fission. We use a triangular distribution in residual nuclear temperature based on the Fermi-gas model. This leads to closed expressions for N(E) and anti nu/sub p/ when sigma/sub c/ is assumed constant and readily computed quadratures when the energy dependence of sigma/sub c/ is determined from an optical model. Neutron spectra and average multiplicities calculated with an energy-dependent cross section agree well with experimental data for the neutron-induced fission of /sup 235/U and the spontaneous fission of /sup 252/Cf. For the latter case, there are some significant inconsistencies between the experimental spectra that need to be resolved. 29 references.

Physical Description

Pages: 36

Notes

NTIS, PC A03/MF A01.

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  • Specialists meeting on yields and decay data of fission product nuclides, Upton, NY, USA, 24 Oct 1983

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  • Other: DE84001724
  • Report No.: LA-UR-83-3074
  • Report No.: CONF-8310104-2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5650331
  • Archival Resource Key: ark:/67531/metadc1093306

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1983

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • May 30, 2018, 12:24 p.m.

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Madland, D.G. & Nix, J.R. Prompt fission neutron spectra and average prompt neutron multiplicities, article, January 1, 1983; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1093306/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.