The 235U prompt fission neutron spectrum measured by the Chi-Nu project at LANSCE

Gomez, J. A.; Devlin, M.; Haight, R. C.; O'Donnell, J. M.; Lee, H. Y.; Mosby, S. M.; Taddeucci, T. N.; Kelly, K. J.; Fotiades, N.; Neudecker, D.; White, M. C.; Talou, P.; Rising, M. E.; Solomon, C. J.; Wu, C. Y.; Bucher, B.; Buckner, M. Q.; Henderson, R. A.

doi:10.1051/epjconf/201714604040

Title: The ²³⁵U prompt fission neutron spectrum measured by the Chi-Nu project at LANSCE

Abstract

The Chi-Nu experiment aims to accurately measure the prompt fission neutron spectrum for the major actinides. At the Los Alamos Neutron Science Center (LANSCE), fission can be induced with neutrons ranging from 0.7 MeV and above. Using a two arm time-of-flight (TOF) technique, the fission neutrons are measured in one of two arrays: a 22-⁶Li glass array for lower energies, or a 54-liquid scintillator array for outgoing energies of 0.5 MeV and greater. Presented here are the collaboration's preliminary efforts at measuring the ²³⁵U PFNS.

Authors:

Gomez, J. A. ^[1]; Devlin, M. ^[1]; Haight, R. C. ^[1]; O'Donnell, J. M. ^[1]; Lee, H. Y. ^[1]; Mosby, S. M. ^[1]; Taddeucci, T. N. ^[1]; Kelly, K. J. ^[1]; Fotiades, N. ^[1]; Neudecker, D. ^[1]; White, M. C. ^[1]; Talou, P. ^[1]; Rising, M. E. ^[1]; Solomon, C. J. ^[1]; Wu, C. Y. ^[2]; Bucher, B. ^[2]; Buckner, M. Q. ^[2]; Henderson, R. A. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:: Wed Sep 13 00:00:00 EDT 2017

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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

OSTI Identifier:: 1412887

Report Number(s):: LA-UR-16-28515
Journal ID: ISSN 2100-014X; TRN: US1800394

Grant/Contract Number:: AC52-06NA25396; AC52-07NA27344

Resource Type:: Accepted Manuscript

Journal Name:: EPJ Web of Conferences

Additional Journal Information:: Journal Volume: 146; Journal ID: ISSN 2100-014X

Publisher:: EDP Sciences

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Gomez, J. A., Devlin, M., Haight, R. C., O'Donnell, J. M., Lee, H. Y., Mosby, S. M., Taddeucci, T. N., Kelly, K. J., Fotiades, N., Neudecker, D., White, M. C., Talou, P., Rising, M. E., Solomon, C. J., Wu, C. Y., Bucher, B., Buckner, M. Q., and Henderson, R. A. The 235U prompt fission neutron spectrum measured by the Chi-Nu project at LANSCE.  United States: N. p., 2017. 
Web.  doi:10.1051/epjconf/201714604040.

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                    Gomez, J. A., Devlin, M., Haight, R. C., O'Donnell, J. M., Lee, H. Y., Mosby, S. M., Taddeucci, T. N., Kelly, K. J., Fotiades, N., Neudecker, D., White, M. C., Talou, P., Rising, M. E., Solomon, C. J., Wu, C. Y., Bucher, B., Buckner, M. Q., & Henderson, R. A. The 235U prompt fission neutron spectrum measured by the Chi-Nu project at LANSCE.  United States.  https://doi.org/10.1051/epjconf/201714604040

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                    Gomez, J. A., Devlin, M., Haight, R. C., O'Donnell, J. M., Lee, H. Y., Mosby, S. M., Taddeucci, T. N., Kelly, K. J., Fotiades, N., Neudecker, D., White, M. C., Talou, P., Rising, M. E., Solomon, C. J., Wu, C. Y., Bucher, B., Buckner, M. Q., and Henderson, R. A. Wed .  
"The 235U prompt fission neutron spectrum measured by the Chi-Nu project at LANSCE".  United States.  https://doi.org/10.1051/epjconf/201714604040.  https://www.osti.gov/servlets/purl/1412887.

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@article{osti_1412887,

  title        = {The 235U prompt fission neutron spectrum measured by the Chi-Nu project at LANSCE},

  author       = {Gomez, J. A. and Devlin, M. and Haight, R. C. and O'Donnell, J. M. and Lee, H. Y. and Mosby, S. M. and Taddeucci, T. N. and Kelly, K. J. and Fotiades, N. and Neudecker, D. and White, M. C. and Talou, P. and Rising, M. E. and Solomon, C. J. and Wu, C. Y. and Bucher, B. and Buckner, M. Q. and Henderson, R. A.},

  abstractNote = {The Chi-Nu experiment aims to accurately measure the prompt fission neutron spectrum for the major actinides. At the Los Alamos Neutron Science Center (LANSCE), fission can be induced with neutrons ranging from 0.7 MeV and above. Using a two arm time-of-flight (TOF) technique, the fission neutrons are measured in one of two arrays: a 22-6Li glass array for lower energies, or a 54-liquid scintillator array for outgoing energies of 0.5 MeV and greater. Presented here are the collaboration's preliminary efforts at measuring the 235U PFNS.},

  doi          = {10.1051/epjconf/201714604040},

  journal      = {EPJ Web of Conferences},

  number       = ,

  volume       = 146,

  place        = {United States},

  year         = {Wed Sep 13 00:00:00 EDT 2017},

  month        = {Wed Sep 13 00:00:00 EDT 2017}

}

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Works referenced in this record:

Prompt Fission Neutron Spectrum Study at Lansce: Chi-Nu Project
conference, November 2013

Lee, H. Y.; Haight, R. C.; Bredeweg, T. A.
Proceedings of the Fifth International Conference on ICFN5, Fission and Properties of Neutron-Rich Nuclei
DOI: 10.1142/9789814525435_0048

Prompt fission neutron energy spectra induced by fast neutrons
journal, August 1995

Staples, P.; Egan, J. J.; Kegel, G. H. R.
Nuclear Physics A, Vol. 591, Issue 1
DOI: 10.1016/0375-9474(95)00119-L

Measurement of prompt neutron spectra from the $^{239}$ Pu( $n$ , $f$ ) fission reaction for incident neutron energies from 1 to 200 MeV
journal, January 2014

Chatillon, A.; Bélier, G.; Granier, T.
Physical Review C, Vol. 89, Issue 1
DOI: 10.1103/PhysRevC.89.014611

Prompt Fission Neutron Spectra of Actinides
journal, January 2016

Capote, R.; Chen, Y. -J.; Hambsch, F. -J.
Nuclear Data Sheets, Vol. 131
DOI: 10.1016/j.nds.2015.12.002

Prompt fission neutron spectra from fission induced by 1 to 8 MeV neutrons on ${}^{235}U$ and ${}^{239}{Pu}$ using the double time-of-flight technique
journal, March 2011

Noda, S.; Haight, R. C.; Nelson, R. O.
Physical Review C, Vol. 83, Issue 3
DOI: 10.1103/PhysRevC.83.034604

The LANL/LLNL Prompt Fission Neutron Spectrum Program at LANSCE and Approach to Uncertainties
journal, January 2015

Haight, R. C.; Wu, C. Y.; Lee, H. Y.
Nuclear Data Sheets, Vol. 123
DOI: 10.1016/j.nds.2014.12.023

The Need for Precise and Well-documented Experimental Data on Prompt Fission Neutron Spectra from Neutron-induced Fission of 239Pu
journal, January 2016

Neudecker, D.; Taddeucci, T. N.; Haight, R. C.
Nuclear Data Sheets, Vol. 131
DOI: 10.1016/j.nds.2015.12.005

Multiple-scattering Corrections to Measurements of the Prompt Fission Neutron Spectrum
journal, January 2015

Taddeucci, T. N.; Haight, R. C.; Lee, H. Y.
Nuclear Data Sheets, Vol. 123
DOI: 10.1016/j.nds.2014.12.024

The Prompt Fission Neutron Spectrum (PFNS) Measurement Program at LANSCE
journal, May 2014

Haight, R. C.; Lee, H. Y.; Taddeucci, T. N.
Nuclear Data Sheets, Vol. 119
DOI: 10.1016/j.nds.2014.08.057

Development of Neutron Detector Arrays for Neutron-Induced Reaction Measurements
journal, April 2013

Perdue, B. A.; Haight, R. C.; Lee, H. Y.
IEEE Transactions on Nuclear Science, Vol. 60, Issue 2
DOI: 10.1109/TNS.2013.2241077

A new method to reduce the statistical and systematic uncertainty of chance coincidence backgrounds measured with waveform digitizers
journal, January 2016

O׳Donnell, J. M.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 805
DOI: 10.1016/j.nima.2015.07.044

Development of an Array of Liquid Scintillators to Measure the Prompt Fission Neutron Spectrum at LANSCE
journal, May 2014

Perdue, B. A.; Taddeucci, T. N.; Haight, R. C.
Nuclear Data Sheets, Vol. 119
DOI: 10.1016/j.nds.2014.08.102

A multiple parallel-plate avalanche counter for fission-fragment detection
journal, September 2015

Wu, C. Y.; Henderson, R. A.; Haight, R. C.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 794
DOI: 10.1016/j.nima.2015.05.010

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Title: The 235U prompt fission neutron spectrum measured by the Chi-Nu project at LANSCE

Abstract

Citation Formats

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The Need for Precise and Well-documented Experimental Data on Prompt Fission Neutron Spectra from Neutron-induced Fission of 239Pu journal, January 2016

Multiple-scattering Corrections to Measurements of the Prompt Fission Neutron Spectrum journal, January 2015

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Title: The ²³⁵U prompt fission neutron spectrum measured by the Chi-Nu project at LANSCE

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