Absolute measurement of the 242Pu neutron-capture cross section

Buckner, M. Q.; Wu, C. Y.; Henderson, R. A.; Bucher, B.; Chyzh, A.; Bredeweg, T. A.; Baramsai, B.; Couture, A.; Jandel, M.; Mosby, S.; O'Donnell, J. M.; Ullmann, J. L.

doi:10.1103/PhysRevC.93.044613

Title: Absolute measurement of the ²⁴²Pu neutron-capture cross section

Abstract

Here, the absolute neutron-capture cross section of ²⁴²Pu was measured at the Los Alamos Neutron Science Center using the Detector for Advanced Neutron-Capture Experiments array along with a compact parallel-plate avalanche counter for fission-fragment detection. The first direct measurement of the ²⁴²Pu(n,γ) cross section was made over the incident neutron energy range from thermal to ≈ 6 keV, and the absolute scale of the (n,γ) cross section was set according to the known ²³⁹Pu(n,f) resonance at E_n,R = 7.83 eV. This was accomplished by adding a small quantity of ²³⁹Pu to the ²⁴²Pu sample. The relative scale of the cross section, with a range of four orders of magnitude, was determined for incident neutron energies from thermal to ≈ 40 keV. Our data, in general, are in agreement with previous measurements and those reported in ENDF/B-VII.1; the ²⁴²Pu(n,γ) cross section at the E_n,R = 2.68 eV resonance is within 2.4% of the evaluated value. However, discrepancies exist at higher energies; our data are ≈30% lower than the evaluated data at E_n ≈ 1 keV and are approximately 2σ away from the previous measurement at E_n ≈ 20 keV.

Authors:

Buckner, M. Q. ^[1]; Wu, C. Y. ^[1]; Henderson, R. A. ^[1]; Bucher, B. ^[1]; Chyzh, A. ^[2]; Bredeweg, T. A. ^[3]; Baramsai, B. ^[3]; Couture, A. ^[3]; Jandel, M. ^[3]; Mosby, S. ^[3]; O'Donnell, J. M. ^[3]; Ullmann, J. L. ^[3]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
North Carolina State Univ., Raleigh, NC (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:: Thu Apr 21 00:00:00 EDT 2016

Research Org.:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1260476

Alternate Identifier(s):: OSTI ID: 1249662

Report Number(s):: LLNL-JRNL-677704
Journal ID: ISSN 2469-9985; PRVCAN

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

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 93; Journal Issue: 4; Journal ID: ISSN 2469-9985

Publisher:: APS

Country of Publication:: United States

Language:: English

Subject:: 11 NUCLEAR FUEL CYCLE AND RUEL MATERIALS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Buckner, M. Q., Wu, C. Y., Henderson, R. A., Bucher, B., Chyzh, A., Bredeweg, T. A., Baramsai, B., Couture, A., Jandel, M., Mosby, S., O'Donnell, J. M., and Ullmann, J. L. Absolute measurement of the 242Pu neutron-capture cross section.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevC.93.044613.

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                    Buckner, M. Q., Wu, C. Y., Henderson, R. A., Bucher, B., Chyzh, A., Bredeweg, T. A., Baramsai, B., Couture, A., Jandel, M., Mosby, S., O'Donnell, J. M., & Ullmann, J. L. Absolute measurement of the 242Pu neutron-capture cross section.  United States.  https://doi.org/10.1103/PhysRevC.93.044613

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                    Buckner, M. Q., Wu, C. Y., Henderson, R. A., Bucher, B., Chyzh, A., Bredeweg, T. A., Baramsai, B., Couture, A., Jandel, M., Mosby, S., O'Donnell, J. M., and Ullmann, J. L. Thu .  
"Absolute measurement of the 242Pu neutron-capture cross section".  United States.  https://doi.org/10.1103/PhysRevC.93.044613.  https://www.osti.gov/servlets/purl/1260476.

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@article{osti_1260476,

  title        = {Absolute measurement of the 242Pu neutron-capture cross section},

  author       = {Buckner, M. Q. and Wu, C. Y. and Henderson, R. A. and Bucher, B. and Chyzh, A. and Bredeweg, T. A. and Baramsai, B. and Couture, A. and Jandel, M. and Mosby, S. and O'Donnell, J. M. and Ullmann, J. L.},

  abstractNote = {Here, the absolute neutron-capture cross section of 242Pu was measured at the Los Alamos Neutron Science Center using the Detector for Advanced Neutron-Capture Experiments array along with a compact parallel-plate avalanche counter for fission-fragment detection. The first direct measurement of the 242Pu(n,γ) cross section was made over the incident neutron energy range from thermal to ≈ 6 keV, and the absolute scale of the (n,γ) cross section was set according to the known 239Pu(n,f) resonance at En,R = 7.83 eV. This was accomplished by adding a small quantity of 239Pu to the 242Pu sample. The relative scale of the cross section, with a range of four orders of magnitude, was determined for incident neutron energies from thermal to ≈ 40 keV. Our data, in general, are in agreement with previous measurements and those reported in ENDF/B-VII.1; the 242Pu(n,γ) cross section at the En,R = 2.68 eV resonance is within 2.4% of the evaluated value. However, discrepancies exist at higher energies; our data are ≈30% lower than the evaluated data at En ≈ 1 keV and are approximately 2σ away from the previous measurement at En ≈ 20 keV.},

  doi          = {10.1103/PhysRevC.93.044613},

  journal      = {Physical Review C},

  number       = 4,

  volume       = 93,

  place        = {United States},

  year         = {Thu Apr 21 00:00:00 EDT 2016},

  month        = {Thu Apr 21 00:00:00 EDT 2016}

}

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Title: Absolute measurement of the 242Pu neutron-capture cross section

Abstract

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Title: Absolute measurement of the ²⁴²Pu neutron-capture cross section

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