Comprehensive Am 242 m neutron-induced reaction cross sections and resonance parameters

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

doi:10.1103/PhysRevC.95.061602

Comprehensive Am 242 m neutron-induced reaction cross sections and resonance parameters

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

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Abstract

The Am242 metastable isomer's neutron-induced destruction mechanisms were studied at the Los Alamos Neutron Science Center using the Detector for Advanced Neutron-Capture Experiments array with a compact parallel-plate avalanche counter. New Am242m neutron-capture cross sections were determined from 100 meV to 10 keV, and the absolute scale was set with respect to a concurrent measurement of the well-known Am242m neutron-induced-fission cross section. The new fission cross section spans an energy range from 100 meV to 1 MeV and was normalized to the ENDF/B-VII.1 evaluated cross section to set the absolute scale. Our Am242m(n,f) cross section agrees well with the cross section of Browne [Phys. Rev. C 29, 2188 (1984)]PRVCAN0556-281310.1103/PhysRevC.29.2188 over this large energy interval. The new neutron-capture cross section measurement complements and agrees well with our recent results reported below 1 eV in Buckner [Phys. Rev. C 95, 024610 (2017)]2469-998510.1103/PhysRevC.95.024610. This new work comprises the most comprehensive study of Am242m(n,γ) above thermal energy. Neutron-induced resonance energies and parameters were deduced with the sammy R-matrix code for incident neutron energies up to 45 eV, and the new average Γγ is 13% higher than the evaluated average γ width.

Original language	English
Article number	061602
Journal	Physical Review C
Volume	95
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.95.061602
State	Published - Jun 30 2017

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10.1103/PhysRevC.95.061602

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@article{7111818d1ea94121915a618e88b6165d,

title = "Comprehensive Am 242 m neutron-induced reaction cross sections and resonance parameters",

abstract = "The Am242 metastable isomer's neutron-induced destruction mechanisms were studied at the Los Alamos Neutron Science Center using the Detector for Advanced Neutron-Capture Experiments array with a compact parallel-plate avalanche counter. New Am242m neutron-capture cross sections were determined from 100 meV to 10 keV, and the absolute scale was set with respect to a concurrent measurement of the well-known Am242m neutron-induced-fission cross section. The new fission cross section spans an energy range from 100 meV to 1 MeV and was normalized to the ENDF/B-VII.1 evaluated cross section to set the absolute scale. Our Am242m(n,f) cross section agrees well with the cross section of Browne [Phys. Rev. C 29, 2188 (1984)]PRVCAN0556-281310.1103/PhysRevC.29.2188 over this large energy interval. The new neutron-capture cross section measurement complements and agrees well with our recent results reported below 1 eV in Buckner [Phys. Rev. C 95, 024610 (2017)]2469-998510.1103/PhysRevC.95.024610. This new work comprises the most comprehensive study of Am242m(n,γ) above thermal energy. Neutron-induced resonance energies and parameters were deduced with the sammy R-matrix code for incident neutron energies up to 45 eV, and the new average Γγ is 13% higher than the evaluated average γ width.",

author = "Buckner, {M. Q.} and Wu, {C. Y.} and Henderson, {R. A.} and B. Bucher and N. Wimer and A. Chyzh and Bredeweg, {T. A.} and B. Baramsai and A. Couture and M. Jandel and S. Mosby and Ullmann, {J. L.}",

note = "Funding Information: This measurement was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Security, LLC under Contract No. DE-AC52-07NA27344 and by Los Alamos National Security, LLC under Contract No. DE-AC52-06NA25396. Additional funding was provided by the U.S. DOE/NNSA Office of Defense Nuclear Nonproliferation Research and Development. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = jun,

day = "30",

doi = "10.1103/PhysRevC.95.061602",

language = "English",

volume = "95",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "6",

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T1 - Comprehensive Am 242 m neutron-induced reaction cross sections and resonance parameters

AU - Buckner, M. Q.

AU - Wu, C. Y.

AU - Henderson, R. A.

AU - Bucher, B.

AU - Wimer, N.

AU - Chyzh, A.

AU - Bredeweg, T. A.

AU - Baramsai, B.

AU - Couture, A.

AU - Jandel, M.

AU - Mosby, S.

AU - Ullmann, J. L.

N1 - Funding Information: This measurement was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Security, LLC under Contract No. DE-AC52-07NA27344 and by Los Alamos National Security, LLC under Contract No. DE-AC52-06NA25396. Additional funding was provided by the U.S. DOE/NNSA Office of Defense Nuclear Nonproliferation Research and Development. Publisher Copyright: © 2017 American Physical Society.

PY - 2017/6/30

Y1 - 2017/6/30

N2 - The Am242 metastable isomer's neutron-induced destruction mechanisms were studied at the Los Alamos Neutron Science Center using the Detector for Advanced Neutron-Capture Experiments array with a compact parallel-plate avalanche counter. New Am242m neutron-capture cross sections were determined from 100 meV to 10 keV, and the absolute scale was set with respect to a concurrent measurement of the well-known Am242m neutron-induced-fission cross section. The new fission cross section spans an energy range from 100 meV to 1 MeV and was normalized to the ENDF/B-VII.1 evaluated cross section to set the absolute scale. Our Am242m(n,f) cross section agrees well with the cross section of Browne [Phys. Rev. C 29, 2188 (1984)]PRVCAN0556-281310.1103/PhysRevC.29.2188 over this large energy interval. The new neutron-capture cross section measurement complements and agrees well with our recent results reported below 1 eV in Buckner [Phys. Rev. C 95, 024610 (2017)]2469-998510.1103/PhysRevC.95.024610. This new work comprises the most comprehensive study of Am242m(n,γ) above thermal energy. Neutron-induced resonance energies and parameters were deduced with the sammy R-matrix code for incident neutron energies up to 45 eV, and the new average Γγ is 13% higher than the evaluated average γ width.

AB - The Am242 metastable isomer's neutron-induced destruction mechanisms were studied at the Los Alamos Neutron Science Center using the Detector for Advanced Neutron-Capture Experiments array with a compact parallel-plate avalanche counter. New Am242m neutron-capture cross sections were determined from 100 meV to 10 keV, and the absolute scale was set with respect to a concurrent measurement of the well-known Am242m neutron-induced-fission cross section. The new fission cross section spans an energy range from 100 meV to 1 MeV and was normalized to the ENDF/B-VII.1 evaluated cross section to set the absolute scale. Our Am242m(n,f) cross section agrees well with the cross section of Browne [Phys. Rev. C 29, 2188 (1984)]PRVCAN0556-281310.1103/PhysRevC.29.2188 over this large energy interval. The new neutron-capture cross section measurement complements and agrees well with our recent results reported below 1 eV in Buckner [Phys. Rev. C 95, 024610 (2017)]2469-998510.1103/PhysRevC.95.024610. This new work comprises the most comprehensive study of Am242m(n,γ) above thermal energy. Neutron-induced resonance energies and parameters were deduced with the sammy R-matrix code for incident neutron energies up to 45 eV, and the new average Γγ is 13% higher than the evaluated average γ width.

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U2 - 10.1103/PhysRevC.95.061602

DO - 10.1103/PhysRevC.95.061602

M3 - Article

AN - SCOPUS:85022182522

SN - 2469-9985

VL - 95

JO - Physical Review C

JF - Physical Review C

IS - 6

M1 - 061602

ER -

Comprehensive Am 242 m neutron-induced reaction cross sections and resonance parameters

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