New constraint on the Np 237 (n,γ) Np 238 integral cross section&nbsp;using the Godiva-IV critical assembly

Tamashiro, A. S.; Burcher, S.; Harke, J. T.; Pierson, Bruce; Duarte, J. G.; Mishnayot, Y.; Padgett, S. W.; Zhao, P.; Gharibyan, N.; Goda, J.; Greenwood, Lawrence R.; Hayes, D.; Hutchinson, J.; Harward, N.; Roberts, K.; Slavik, G.; Walker, J.

doi:10.1103/physrevc.110.014626

New constraint on the Np 237 (n,γ) Np 238 integral cross section using the Godiva-IV critical assembly

Journal Article · Wed Jul 31 00:00:00 EDT 2024 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.110.014626· OSTI ID:2481989

^[1]; ^[1]; ^[1]; ^[2]; ^[1]; Mishnayot, Y. ^[1]; Padgett, S. W. ^[1]; Zhao, P. ^[1]; Gharibyan, N. ^[1]; ^[3]; ^[2]; ^[3]; Hutchinson, J. ^[3]; Harward, N. ^[1]; Roberts, K. ^[1]; Slavik, G. ^[3]; Walker, J. ^[3]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Accurate knowledge of the ²³⁷Np(n, γ)²³⁸Np cross section at fast neutron energies is important for applied nuclear science. The presently available experimental data has large disagreements in the fast neutron region. Perform a model-independent measurement of the ²³⁷Np(n, γ)²³⁸Np integral cross section using a well characterized fast neutron source and compare the result with previous measurements and current nuclear data evaluations. Provide an integral measurement that can be used as a benchmark for current evaluations. Multiple samples of ²³⁷Np were irradiated in the Godiva-IV critical assembly. Following the irradiation, the samples placed in a γ-ray counting setup and the γ-rays emitted from the decay of ²³⁸Np were measured over a time period of approximately 7 days. Multiple γ-ray decay branches of ²³⁸Np were observed. The observed activity of ²³⁸Np was used to calculate the amount of ²³⁸Np produced during the irradiation via the ²³⁷Np(n, γ)²³⁸Np reaction and an integral cross section of 342(11) mb was measured for the Godiva-IV neutron spectrum. Further, the ²³⁸Np half-life has been measured with a result of 50.31(5) hours. The ²³⁷Np(n, γ)²³⁸Np integral cross section measured in this work is in agreement with overlapping 1σ error bands to ENDF/B-VIII.0. However, the measured value is 3σ away from the calculated integral cross section using JENDL-5. This measurement offers a reliable benchmark for future ²³⁷Np(n, γ)²³⁸Np cross section evaluations.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation

Grant/Contract Number:: 89233218CNA000001; AC05-76RL01830; AC52-07NA27344

OSTI ID:: 2481989

Alternate ID(s):: OSTI ID: 2474664
OSTI ID: 2506989

Report Number(s):: LA-UR--24-23480; PNNL-SA--206070

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 110; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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