Measurement of the energy-differential 35Cl(n, p0) 35S cross section via the ratio with 6Li(n, α) 3H

Nagel, T. S.; Brown, J. A.; Batchelder, J. C.; Bleuel, D.; Brand, C. A.; Georgiadou, A.; Goldblum, B. L.; Fratoni, M.; Gordon, J. M.; Laplace, T. A.; Bernstein, L. A.

doi:10.1103/physrevc.110.034612

Measurement of the energy-differential ³⁵Cl(n, p₀) ³⁵S cross section via the ratio with ⁶Li(n, α) ³H

Journal Article · Thu Sep 12 00:00:00 EDT 2024 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.110.034612· OSTI ID:2472516

Nagel, T. S. ^[1]; Brown, J. A. ^[1]; ^[1]; ^[2]; ^[3]; ^[1]; ^[4]; ^[1]; ^[1]; ^[1]; ^[4]

University of California, Berkeley, CA (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
University of California, Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Knowledge of the neutron-induced ³⁵Cl ⁢(n, x) cross sections is vital to the design and certification of molten chloride fast reactors (MCFRs) since the ³⁵Cl (n, p₀) ³⁵S reaction is believed to be a significant reactor poison. However, recently published measurements are inconsistent with each other and with evaluation. Here, the goal of this work is to measure the ³⁵Cl (n, p₀) reaction cross section using a technique that is different from recent measurements. The experiment was conducted at Lawrence Berkeley National Laboratory's (LBNL) 88-Inch Cyclotron using thick target deuteron breakup from a 14 MeV deuteron beam. Energy-differential ³⁵Cl (n, p₀) ³⁵S cross sections were obtained via ratio with the ⁶Li (n, a)⁢ ³H reaction using an active target experiment with a Cs₂⁢LiYCl₆ (CLYC) scintillator. The ³⁵Cl (n, p₀) reaction cross section was measured from 2.02 to 7.46 MeV. The results are consistent with Kuvin et al., confirming a roughly 50% reduction in magnitude relative to the ENDF/B-VIII.0 evaluation. These data provide new insight into the role of natural Cl as an MCFR poison. The reduction of the ³⁵Cl (n, p₀) reaction cross section compared to evaluation suggests that MCFR criticality is less sensitive to Cl enrichment. This may in turn reduce building and operating costs since isotope separation may not be needed.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: AC52-07NA27344; AC02-05CH11231; NE0008992; NA0003996

OSTI ID:: 2472516

Alternate ID(s):: OSTI ID: 2474343

Report Number(s):: LLNL--JRNL-870593; 1107816

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 110; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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