Active target measurement of ³⁵Cl(n, p) and ³⁵Cl(n, α) cross sections using CLYC detectors

Justin Warren
Ohio University

Recent measurements of neutron induced reactions on ³⁵Cl have shown deviations from the ENDF/B-VIII.0 evaluation. Neutron reaction data for ³⁵Cl is an important input in the design, simulation, and operation for molten chloride fast reactors. CLYC (Cs₂LiYCl₆:Ce) detectors are a class of cubic elpasolite inorganic crystal scintillators composed of ∼ 45% ³⁵Cl by number density. No recent published measurements have covered the 100 keV to 600 keV energy range. We present new measurements of the ³⁵Cl(n, p) and ³⁵Cl(n, α) cross sections from 100 keV to 12 MeV made at the Edwards Accelerator Lab at Ohio University utilizing CLYC detectors as active targets. Measurements were made at the Beam Swinger and Time-of-Flight Tunnel facility. Multiple experiments used ⁹Be(p, n), ⁹Be(d, n), and D(d, n) sources to provide overlapping coverage of the energy range. Preliminary results from the experimental campaign show significant deviation from the ENDF/B-VIII.0 evaluation and suggest a new evaluation may be necessary.

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