Event-by-Event Fission with FREYA

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The recently developed code FREYA (Fission Reaction Event Yield Algorithm) generates large samples of complete fission events, consisting of two receding product nuclei as well as a number of neutrons and photons, all with complete kinematic information. Thus it is possible to calculate arbitrary correlation observables whose behavior may provide unique insight into the fission process. The presentation first discusses the present status of FREYA, which has now been extended up to energies where pre-equilibrium emission becomes significant and one or more neutrons may be emitted prior to fission. Concentrating on {sup 239}Pu(n,f), we discuss the neutron multiplicity correlations, the ... continued below

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10 p. (0.2 MB)

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Randrup, J. & Vogt, R. November 9, 2010.

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The recently developed code FREYA (Fission Reaction Event Yield Algorithm) generates large samples of complete fission events, consisting of two receding product nuclei as well as a number of neutrons and photons, all with complete kinematic information. Thus it is possible to calculate arbitrary correlation observables whose behavior may provide unique insight into the fission process. The presentation first discusses the present status of FREYA, which has now been extended up to energies where pre-equilibrium emission becomes significant and one or more neutrons may be emitted prior to fission. Concentrating on {sup 239}Pu(n,f), we discuss the neutron multiplicity correlations, the dependence of the neutron energy spectrum on the neutron multiplicity, and the relationship between the fragment kinetic energy and the number of neutrons and their energies. We also briefly suggest novel fission observables that could be measured with modern detectors.

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10 p. (0.2 MB)

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PDF-file: 10 pages; size: 0.2 Mbytes

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  • Presented at: Scientific Workshop on Nuclear Fission dynamics and the Emission of Prompt Neutrons and Gamma Rays, Sinaia, Romania, Sep 27 - Sep 29, 2010

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  • Report No.: LLNL-CONF-471564
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1018764
  • Archival Resource Key: ark:/67531/metadc841181

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  • November 9, 2010

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  • May 19, 2016, 3:16 p.m.

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  • April 13, 2017, 3:05 p.m.

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Randrup, J. & Vogt, R. Event-by-Event Fission with FREYA, article, November 9, 2010; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc841181/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.