Event-by-event study of neutron observables in spontaneous and thermal fission

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The event-by-event fission model FREYA is extended to spontaneous fission of actinides and a variety of neutron observables are studied for spontaneous fission and fission induced by thermal neutrons with a view towards possible applications for SNM detection. We have shown that event-by-event models of fission, such as FREYA, provide a powerful tool for studying fission neutron correlations. Our results demonstrate that these correlations are significant and exhibit a dependence on the fissioning nucleus. Since our method is phenomenological in nature, good input data are especially important. Some of the measurements employed in FREYA are rather old and statistics limited. ... continued below

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Vogt, R & Randrup, J September 14, 2011.

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The event-by-event fission model FREYA is extended to spontaneous fission of actinides and a variety of neutron observables are studied for spontaneous fission and fission induced by thermal neutrons with a view towards possible applications for SNM detection. We have shown that event-by-event models of fission, such as FREYA, provide a powerful tool for studying fission neutron correlations. Our results demonstrate that these correlations are significant and exhibit a dependence on the fissioning nucleus. Since our method is phenomenological in nature, good input data are especially important. Some of the measurements employed in FREYA are rather old and statistics limited. It would be useful to repeat some of these studies with modern detector techniques. In addition, most experiments made to date have not made simultaneous measurements of the fission products and the prompt observables, such as neutron and photons. Such data, while obviously more challenging to obtain, would be valuable for achieving a more complete understanding of the fission process.

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PDF-file: 18 pages; size: 0.4 Mbytes

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  • Journal Name: Physical Review, C (Nuclear Physics); Journal Volume: 84; Journal Issue: 4

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  • Report No.: LLNL-JRNL-499401
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1035968
  • Archival Resource Key: ark:/67531/metadc839988

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  • September 14, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 5, 2016, 3:23 p.m.

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Vogt, R & Randrup, J. Event-by-event study of neutron observables in spontaneous and thermal fission, article, September 14, 2011; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc839988/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.