Measurement of the Am242m neutron-induced reaction cross sections

Buckner, M. Q.; Wu, C. Y.; Henderson, R. A.; Bucher, B.; Wimer, N.; Chyzh, A.; Bredeweg, T. A.; Baramsai, B.; Couture, A.; Jandel, M.; Mosby, S.; Ullmann, J. L.

doi:10.1103/PhysRevC.95.024610

Measurement of the ${}^{242 m}{Am}$ neutron-induced reaction cross sections

Journal Article · Fri Feb 17 04:00:00 EST 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.024610· OSTI ID:1345338

Buckner, M. Q. ^[1]; Wu, C. Y. ^[1]; Henderson, R. A. ^[1]; Bucher, B. ^[1]; Wimer, N. ^[1]; Chyzh, A. ^[2]; Bredeweg, T. A. ^[3]; Baramsai, B. ^[3]; Couture, A. ^[3]; Jandel, M. ^[3]; Mosby, S. ^[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)

The neutron-induced reaction cross sections of ^242mAm were 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. A new neutron-capture cross section was determined, and the absolute scale was set according to a concurrent measurement of the well-known ^242mAm(n,f) cross section. The (n,γ) cross section was measured from thermal energy to an incident energy of 1 eV at which point the data quality was limited by the reaction yield in the laboratory. Our new ^242mAm fission cross section was normalized to ENDF/B-VII.1 to set the absolute scale, and it agreed well with the (n,f) cross section from thermal energy to 1 keV. Lastly, the average absolute capture-to-fission ratio was determined from thermal energy to E_n = 0.1 eV, and it was found to be 26(4)% as opposed to the ratio of 19% from the ENDF/B-VII.1 evaluation.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: DANCE Collaboration

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1345338

Alternate ID(s):: OSTI ID: 1344190

Report Number(s):: LLNL-JRNL--700220

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 95; ISSN PRVCAN; ISSN 2469-9985

Publisher:: APSCopyright Statement

Country of Publication:: United States

Language:: English

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