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(6)Li-loaded liquid scintillators with pulse shape discrimination.

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Area of Science:

  • Nuclear Physics
  • Materials Science
  • Scintillation Detection

Background:

  • Liquid scintillators are crucial for detecting neutrons.
  • Previous formulations faced limitations in lithium-6 loading and operational stability.
  • Boron-10 loaded liquids are a common alternative but have lower light output.

Purpose of the Study:

  • To develop a high-performance liquid scintillator with enhanced lithium-6 loading.
  • To evaluate the pulse height and pulse shape discrimination capabilities of the new formulation.
  • To assess the stability and light output of the scintillator for neutron detection.

Main Methods:

  • Dissolving lithium-6 salicylate in a toluene-methanol solvent system.
  • Incorporating naphthalene and 9,10 diphenylanthracene as solutes.
  • Preparing large-volume scintillator cells (up to 5 cm diameter, 15.2 cm deep).
  • Evaluating pulse height and pulse shape discrimination performance.
  • Comparing performance against dioxane-water systems and boron-10 loaded liquids.

Main Results:

  • Achieved excellent pulse height and pulse shape discrimination with up to 10 wt.% lithium-6 loading.
  • Demonstrated improved performance at higher lithium-6 concentrations compared to dioxane-water systems.
  • Confirmed stability at temperatures as low as -10 degrees C.
  • Observed higher light output for slow neutron detection than boron-10 loaded liquids.

Conclusions:

  • The developed toluene-methanol based liquid scintillator offers superior performance for neutron detection with high lithium-6 loading.
  • This formulation provides enhanced stability and light output, making it a promising alternative for various applications.
  • Further neutron efficiency calculations are presented to support the findings.