Measurement of the energy and multiplicity distributions of neutrons from the photofission of U235

Clarke, S. D.; Wieger, B. M.; Enqvist, A.; Vogt, R.; Randrup, J.; Haight, R. C.; Lee, H. Y.; Perdue, B. A.; Kwan, E.; Wu, C. Y.; Henderson, R. A.; Pozzi, S. A.

doi:10.1103/PhysRevC.95.064612

Title: Measurement of the energy and multiplicity distributions of neutrons from the photofission of ${}^{235}U$

Abstract

For the first time, the complete neutron multiplicity distribution has been measured in this study from the photofission of ²³⁵U induced by high-energy spallation γ rays arriving ahead of the neutron beam at the Los Alamos Neutron Science Center. The resulting average neutron multiplicity 3.80 ± 0.08 (stat.) neutrons per photofission is in general agreement with previous measurements. In addition, unique measurements of the prompt fission energy spectrum of the neutrons from photofission and the angular correlation of two-neutron energies emitted in photofission also were made. Finally, the results are compared to calculations with the complete event fission model FREYA.

Authors:

Clarke, S. D. ^[1]; Wieger, B. M. ^[1]; Enqvist, A. ^[2]; Vogt, R. ^[3]; Randrup, J. ^[4]; Haight, R. C. ^[5]; Lee, H. Y. ^[5]; Perdue, B. A. ^[5]; Kwan, E. ^[6]; Wu, C. Y. ^[7]; Henderson, R. A. ^[7]; Pozzi, S. A. ^[1]

Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering and Radiological Sciences
Univ. of Florida, Gainesville, FL (United States). Materials Science and Engineering
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division; Univ. of California, Davis, CA (United States). Dept. of Physics
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division

Publication Date:: Tue Jun 20 00:00:00 EDT 2017

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP); USDOE Office of Nuclear Energy (NE), Nuclear Reactor Technologies (NE-7). Nuclear Engineering University Program (NEUP); USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1366927

Alternate Identifier(s):: OSTI ID: 1364673; OSTI ID: 1423620; OSTI ID: 1429999; OSTI ID: 1454780

Report Number(s):: LLNL-JRNL-732408; LA-UR-17-24351
Journal ID: ISSN 2469-9985

Grant/Contract Number:: AC52-07NA27344; AC02-05CH11231; AC52-06NA25396; AC07-05ID14517; NA0002534

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; fission; neutron physics; nucleon induced nuclear reactions; Fission neutron multiplicity correlations

Citation Formats


                    Clarke, S. D., Wieger, B. M., Enqvist, A., Vogt, R., Randrup, J., Haight, R. C., Lee, H. Y., Perdue, B. A., Kwan, E., Wu, C. Y., Henderson, R. A., and Pozzi, S. A. Measurement of the energy and multiplicity distributions of neutrons from the photofission of U235.  United States: N. p., 2017. 
Web.  doi:10.1103/PhysRevC.95.064612.

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                    Clarke, S. D., Wieger, B. M., Enqvist, A., Vogt, R., Randrup, J., Haight, R. C., Lee, H. Y., Perdue, B. A., Kwan, E., Wu, C. Y., Henderson, R. A., & Pozzi, S. A. Measurement of the energy and multiplicity distributions of neutrons from the photofission of U235.  United States.  https://doi.org/10.1103/PhysRevC.95.064612

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                    Clarke, S. D., Wieger, B. M., Enqvist, A., Vogt, R., Randrup, J., Haight, R. C., Lee, H. Y., Perdue, B. A., Kwan, E., Wu, C. Y., Henderson, R. A., and Pozzi, S. A. Tue .  
"Measurement of the energy and multiplicity distributions of neutrons from the photofission of U235".  United States.  https://doi.org/10.1103/PhysRevC.95.064612.  https://www.osti.gov/servlets/purl/1366927.

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@article{osti_1366927,

  title        = {Measurement of the energy and multiplicity distributions of neutrons from the photofission of U235},

  author       = {Clarke, S. D. and Wieger, B. M. and Enqvist, A. and Vogt, R. and Randrup, J. and Haight, R. C. and Lee, H. Y. and Perdue, B. A. and Kwan, E. and Wu, C. Y. and Henderson, R. A. and Pozzi, S. A.},

  abstractNote = {For the first time, the complete neutron multiplicity distribution has been measured in this study from the photofission of 235U induced by high-energy spallation γ rays arriving ahead of the neutron beam at the Los Alamos Neutron Science Center. The resulting average neutron multiplicity 3.80 ± 0.08 (stat.) neutrons per photofission is in general agreement with previous measurements. In addition, unique measurements of the prompt fission energy spectrum of the neutrons from photofission and the angular correlation of two-neutron energies emitted in photofission also were made. Finally, the results are compared to calculations with the complete event fission model FREYA.},

  doi          = {10.1103/PhysRevC.95.064612},

  journal      = {Physical Review C},

  number       = 6,

  volume       = 95,

  place        = {United States},

  year         = {Tue Jun 20 00:00:00 EDT 2017},

  month        = {Tue Jun 20 00:00:00 EDT 2017}

}

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Fragment characteristics from fission of 238U and 234U induced by 6.5–9.0 MeV bremsstrahlung
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Event-by-event study of photon observables in spontaneous and thermal fission
journal, April 2013

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Neutron angular correlations in spontaneous and neutron-induced fission
journal, December 2014

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Event-by-event study of neutron observables in spontaneous and thermal fission
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Works referencing / citing this record:

Review on the progress in nuclear fission—experimental methods and theoretical descriptions
journal, September 2018

Schmidt, Karl-Heinz; Jurado, Beatriz
Reports on Progress in Physics, Vol. 81, Issue 10
DOI: 10.1088/1361-6633/aacfa7

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Title: Measurement of the energy and multiplicity distributions of neutrons from the photofission of U 235

Abstract

Citation Formats

Calculation of fission observables through event-by-event simulation journal, August 2009

Identification of shielded neutron sources with the liquid scintillator BC-501A using a digital pulse shape discrimination method journal, July 2007

Measurement of prompt neutron polarization asymmetries in photofission of 235 , 238 U, 239 Pu, and 232 Th journal, January 2012

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Photonuclear Physics in Radiation Transport—III: Actinide Cross Sections and Spectra journal, May 2006

A comparison of four different digital algorithms for pulse-shape discrimination in fast scintillators journal, June 2011

Photonuclear Physics in Radiation Transport—II: Implementation journal, June 2003

Exploring the multihumped fission barrier of 238 U via sub-barrier photofission journal, April 2013

Photonuclear Physics in Radiation Transport—I: Cross Sections and Spectra journal, June 2003

Fragment characteristics from fission of 238U and 234U induced by 6.5–9.0 MeV bremsstrahlung journal, February 2011

Event-by-event study of photon observables in spontaneous and thermal fission journal, April 2013

Neutron angular correlations in spontaneous and neutron-induced fission journal, December 2014

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Title: Measurement of the energy and multiplicity distributions of neutrons from the photofission of ${}^{235}U$

Calculation of fission observables through event-by-event simulation
journal, August 2009

Identification of shielded neutron sources with the liquid scintillator BC-501A using a digital pulse shape discrimination method
journal, July 2007

Measurement of prompt neutron polarization asymmetries in photofission of $^{235, 238}$ U, $^{239}$ Pu, and $^{232}$ Th
journal, January 2012

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journal, February 1956

Photonuclear Physics in Radiation Transport—III: Actinide Cross Sections and Spectra
journal, May 2006

A comparison of four different digital algorithms for pulse-shape discrimination in fast scintillators
journal, June 2011

Photonuclear Physics in Radiation Transport—II: Implementation
journal, June 2003

Exploring the multihumped fission barrier of $^{238}$ U via sub-barrier photofission
journal, April 2013

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journal, June 2003

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journal, February 2011

Event-by-event study of photon observables in spontaneous and thermal fission
journal, April 2013

Neutron angular correlations in spontaneous and neutron-induced fission
journal, December 2014

Event-by-event study of neutron observables in spontaneous and thermal fission
journal, October 2011

Experimental Determination of Photofission Neutron Multiplicities for ²³⁵ U, ²³⁶ U, ²³⁸ U, and ²³² Th Using Monoenergetic Photons
journal, February 1980

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journal, April 2014

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journal, September 2018