Constraining calculations of 239Pu ⁢(𝑛, 𝛾) cross sections with multistep cascade 𝛾-ray spectra measured at the DANCE facility

Ullmann, J. L.; Kawano, T.; Baramsai, B.; Bredeweg, T. A.; Couture, A.; Jandel, M.; Mosby, S.; O'Donnell, J. M.; Rundberg, R. S.; Sasaki, H.; Vieira, D. J.; Wilhelmy, J. B.; Krtička, M.; Chyzh, A.; Henderson, R.; Wu, C. Y.

doi:10.1103/physrevc.111.024610

Constraining calculations of ²³⁹Pu ⁢(𝑛, 𝛾) cross sections with multistep cascade 𝛾-ray spectra measured at the DANCE facility

Journal Article · Thu Feb 13 00:00:00 EST 2025 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.111.024610· OSTI ID:2516779

^[1]; ^[1]; ^[2]; ^[1]; ^[1]; Jandel, M. ^[3]; Mosby, S. ^[1]; O'Donnell, J. M. ^[1]; Rundberg, R. S. ^[1]; ^[1]; Vieira, D. J. ^[1]; Wilhelmy, J. B. ^[1]; ^[4]; ^[5]; Henderson, R. ^[5]; ^[5]

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Vantage Partners, Brook Park, OH (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of Massachusetts, Lowell, MA (United States)
Charles Univ., Prague (Czech Republic)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Measurements of multistep cascade gamma-ray spectra from several low-lying 1⁺ resonances in the ²³⁹Pu ⁢(𝑛, 𝛾) reaction were made using the DANCE detector. The measured spectra are compared to spectra simulated using several models for the photon strength function and the nuclear level density, representing the first analysis of this nature on a fissile nucleus. In general, models of the photon strength function that included a strong 𝑀⁢1 “scissors mode” contribution coupled with a Gilbert-Cameron nuclear level density provided a reasonable description of the spectra. Simulations using photon strength functions and nuclear level densities specifically for ²⁴⁰Pu, extracted by the Oslo method, resulted in a very good representation of the measured spectra. Neutron-capture cross section calculations that included the scissors mode provided a good estimate of the previously measured values, without additional normalization. However, the scissors-mode energy that produced the best description of the multistep cascade spectra was different from the value that best reproduced the capture cross section. In addition, the ⟨Γ_𝛾⟩ inferred from the multistep cascade calculations was somewhat less than the tabulated value, which was determined from resonance analysis.

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

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

Grant/Contract Number:: 89233218CNA000001; AC52-07NA27344

OSTI ID:: 2516779

Alternate ID(s):: OSTI ID: 2588482

Report Number(s):: LLNL--JRNL-866772

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 111; ISSN 2469-9985; ISSN 2469-9993

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Constraining calculations of ²³⁹Pu ⁢(𝑛, 𝛾) cross sections with multistep cascade 𝛾-ray spectra measured at the DANCE facility