Measurement and model analysis of (n,xα) cross sections for Cr, Fe, 59Co, and 58,60Ni from threshold energy to 150 MeV

S. Kunieda, R. C. Haight, T. Kawano, M. B. Chadwick, S. M. Sterbenz, F. B. Bateman, O. A. Wasson, S. M. Grimes, P. Maier-Komor, H. Vonach, T. Fukahori, Yukinobu Watanabe

研究成果: ジャーナルへの寄稿記事

11 引用 (Scopus)

抄録

Neutron reactions that produce α particles have been investigated experimentally and analyzed by reaction model calculations for incident neutron energies from threshold to 150 MeV on elemental chromium and iron. The cross sections were measured at the Los Alamos Neutron Science Center by direct observation of α particles. Previous data on isotopes 59Co and 58 ,60Ni were also included in the analysis. The model calculations are made for both statistical decay and pre-equilibrium processes. This study particularly focuses on the pre-equilibrium cluster emission, which is described by the clustering exciton model of Iwamoto and Harada. We calculate the α-particle formation factors numerically without any of the approximations that appeared in the original model. The model parameter ΔR, the nuclear surface area where the pickup reaction may occur, is determined by fitting the calculated α-particle energy spectra to experimental data. The calculated α-particle-production cross sections agree well with the measured data, except for the Cr case. With a simple sensitivity study for the level density parameters, it is reported that relatively small changes in the level density parameters improve the reproduction of experimental data significantly. Our realistic model calculations for the pre-equilibrium process shed light on uncertainties in the nuclear level densities in statistical decay calculation.

元の言語英語
記事番号054602
ジャーナルPhysical Review C - Nuclear Physics
85
発行部数5
DOI
出版物ステータス出版済み - 5 1 2012

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thresholds
cross sections
neutrons
energy
sheds
particle production
decay
particle energy
chromium
energy spectra
isotopes
excitons
iron
sensitivity
sensors
approximation

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

これを引用

Measurement and model analysis of (n,xα) cross sections for Cr, Fe, 59Co, and 58,60Ni from threshold energy to 150 MeV. / Kunieda, S.; Haight, R. C.; Kawano, T.; Chadwick, M. B.; Sterbenz, S. M.; Bateman, F. B.; Wasson, O. A.; Grimes, S. M.; Maier-Komor, P.; Vonach, H.; Fukahori, T.; Watanabe, Yukinobu.

:: Physical Review C - Nuclear Physics, 巻 85, 番号 5, 054602, 01.05.2012.

研究成果: ジャーナルへの寄稿記事

Kunieda, S, Haight, RC, Kawano, T, Chadwick, MB, Sterbenz, SM, Bateman, FB, Wasson, OA, Grimes, SM, Maier-Komor, P, Vonach, H, Fukahori, T & Watanabe, Y 2012, 'Measurement and model analysis of (n,xα) cross sections for Cr, Fe, 59Co, and 58,60Ni from threshold energy to 150 MeV', Physical Review C - Nuclear Physics, 巻. 85, 番号 5, 054602. https://doi.org/10.1103/PhysRevC.85.054602
Kunieda, S. ; Haight, R. C. ; Kawano, T. ; Chadwick, M. B. ; Sterbenz, S. M. ; Bateman, F. B. ; Wasson, O. A. ; Grimes, S. M. ; Maier-Komor, P. ; Vonach, H. ; Fukahori, T. ; Watanabe, Yukinobu. / Measurement and model analysis of (n,xα) cross sections for Cr, Fe, 59Co, and 58,60Ni from threshold energy to 150 MeV. :: Physical Review C - Nuclear Physics. 2012 ; 巻 85, 番号 5.
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AU - Bateman, F. B.

AU - Wasson, O. A.

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