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Background model for the NaI(Tl) crystals in COSINE-100.

P Adhikari1, G Adhikari1, E Barbosa de Souza2

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This summary is machine-generated.

The COSINE-100 experiment uses NaI(Tl) detectors to search for dark matter. Monte Carlo simulations helped identify lead and tritium as the main background sources in their detectors.

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Area of Science:

  • Experimental particle physics
  • Astroparticle physics
  • Dark matter detection

Background:

  • Understanding background radiation is crucial for sensitive dark matter experiments.
  • Internal and external radioactive sources, including cosmogenic nuclides, contribute to detector backgrounds.
  • Precise background modeling is essential to distinguish potential dark matter signals from known radioactive processes.

Purpose of the Study:

  • To develop accurate background models for the COSINE-100 experiment.
  • To identify and quantify the sources of measured backgrounds in NaI(Tl) detectors.
  • To improve the sensitivity of dark matter searches by accounting for background contributions.

Main Methods:

  • Utilized Geant4 toolkit for Monte Carlo simulations of detector responses.
  • Developed crystal-specific background models incorporating internal and external sources.
  • Performed material assays to guide and validate simulation parameters.
  • Compared simulation results with experimental measurement data.

Main Results:

  • Established background models for six NaI(Tl) crystals (70 kg total mass).
  • Determined an average background level of 3.5 counts/day/keV/kg in the (2-6) keV energy range.
  • Identified lead ( Pb) and tritium ( H) as the dominant background contributors in the studied energy interval.

Conclusions:

  • The developed background models provide a reliable framework for interpreting COSINE-100 data.
  • Lead and tritium are significant sources of background noise, necessitating mitigation strategies.
  • Accurate background understanding enhances the capability to search for Weakly Interacting Massive Particles (WIMPs).