Growth of <sup>6</sup>Li-enriched LiCl/BaCl<sub>2</sub> eutectic as a novel neutron scintillator

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<jats:title>Abstract</jats:title> <jats:p>In this study, Eu:<jats:sup>6</jats:sup>LiCl/BaCl<jats:sub>2</jats:sub> with a high Li concentration was developed as a novel thermal neutron scintillator. Eu ions were doped as activators for the BaCl<jats:sub>2</jats:sub> phase, and Eu:<jats:sup>6</jats:sup>LiCl/BaCl<jats:sub>2</jats:sub> eutectics were grown via the vertical Bridgman–Stockbarger method in quartz ampoules (inner diameter = 4 mm). The Eu:<jats:sup>6</jats:sup>LiCl/BaCl<jats:sub>2</jats:sub> eutectic exhibited a lamellar eutectic structure and optical transparency. The 400 nm emission due to the Eu<jats:sup>2+</jats:sup> 4f–5d transition was observed in the BaCl<jats:sub>2</jats:sub> phase by a cathode luminescence measurement. The light yield under neutrons was estimated to be over 20 200 photons MeV<jats:sup>−1</jats:sup>. A PSD study was also performed using gamma and alpha-rays. The Eu:<jats:sup>6</jats:sup>LiCl/BaCl<jats:sub>2</jats:sub> eutectic scintillator showed good potential for PSD.</jats:p>

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