Detailed modeling of fission with FREYA

Vogt, R.; Randrup, J.

doi:10.1016/j.nima.2018.09.060

Title: Detailed modeling of fission with $F R E Y A$

Abstract

For many years, the state of the art for treating fission in radiation transport codes has involved sampling from average distributions. However, such “average” fission models have limited interaction-by-interaction capabilities. Energy is not explicitly conserved and no correlations are available because all particles are emitted isotropically and independently. However, in a true fission event, the energies, momenta and multiplicities of emitted particles are correlated. Such correlations are interesting for many modern applications, including detector development and detection of small amounts of special material. Recently, several Monte Carlo codes have become available that calculate complete fission events. Event-by-event techniques are particularly useful because it is possible to obtain the fission products as well as the prompt neutrons and photons emitted during an individual fission process, all with complete kinematic information. It is therefore possible to extract any desired correlation observables. Such codes, when included in broader Monte Carlo transport codes, such as MCNP, can be made broadly available to the community. One such code, FREYA (Fission Reaction Event Yield Algorithm), is particularly fast and can readily generate large samples of complete fission events. We briefly describe here the physics in FREYA and compare our results with relevant available data on promptmore »« less

Authors:

Vogt, R. ^[1]; Randrup, J. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division; Univ. of California, Davis, CA (United States). Physics Dept.
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division

Publication Date:: 2018-09-24

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation

OSTI Identifier:: 1515337

Alternate Identifier(s):: OSTI ID: 1636264

Report Number(s):: LLNL-JRNL-753800
Journal ID: ISSN 0168-9002; 940436

Grant/Contract Number:: AC52-07NA27344; AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

Additional Journal Information:: Journal Volume: 954; Journal Issue: C; Journal ID: ISSN 0168-9002

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; nuclear fission; correlations; fission simulations

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                    Vogt, R., and Randrup, J. Detailed modeling of fission with FREYA.  United States: N. p., 2018. 
Web.  doi:10.1016/j.nima.2018.09.060.

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                    Vogt, R., & Randrup, J. Detailed modeling of fission with FREYA.  United States.  https://doi.org/10.1016/j.nima.2018.09.060

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                    Vogt, R., and Randrup, J. Mon .  
"Detailed modeling of fission with FREYA".  United States.  https://doi.org/10.1016/j.nima.2018.09.060.  https://www.osti.gov/servlets/purl/1515337.

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@article{osti_1515337,

  title        = {Detailed modeling of fission with FREYA},

  author       = {Vogt, R. and Randrup, J.},

  abstractNote = {For many years, the state of the art for treating fission in radiation transport codes has involved sampling from average distributions. However, such “average” fission models have limited interaction-by-interaction capabilities. Energy is not explicitly conserved and no correlations are available because all particles are emitted isotropically and independently. However, in a true fission event, the energies, momenta and multiplicities of emitted particles are correlated. Such correlations are interesting for many modern applications, including detector development and detection of small amounts of special material. Recently, several Monte Carlo codes have become available that calculate complete fission events. Event-by-event techniques are particularly useful because it is possible to obtain the fission products as well as the prompt neutrons and photons emitted during an individual fission process, all with complete kinematic information. It is therefore possible to extract any desired correlation observables. Such codes, when included in broader Monte Carlo transport codes, such as MCNP, can be made broadly available to the community. One such code, FREYA (Fission Reaction Event Yield Algorithm), is particularly fast and can readily generate large samples of complete fission events. We briefly describe here the physics in FREYA and compare our results with relevant available data on prompt neutron and photon emission. We discuss correlated measurements in particular for validation.},

  doi          = {10.1016/j.nima.2018.09.060},

  journal      = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},

  number       = C,

  volume       = 954,

  place        = {United States},

  year         = {2018},

  month        = {9}

}

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https://doi.org/10.1016/j.nima.2018.09.060

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Figure 1: The photon energy spectrum calculated for ²⁵²Cf(sf) compared to data from Billnert et al. The total photon spectrum is shown on the left-hand side while the spectrum for energies less than 1 MeV are shown on the right-hand side. Both spectra are normalized to the fission photon multiplicity.more »

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Title: Detailed modeling of fission with F R E Y A

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Title: Detailed modeling of fission with $F R E Y A$