4.7 Article

Alpha backgrounds in the AMoRE-Pilot experiment

Journal

EUROPEAN PHYSICAL JOURNAL C
Volume 82, Issue 12, Pages -

Publisher

SPRINGER
DOI: 10.1140/epjc/s10052-022-11104-3

Keywords

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Funding

  1. Institute for Basic Science (Korea) [IBS-R016-D1, IBS-R016-A2]
  2. grant for the joint Korea-Ukraine project on AMoRE
  3. National Research Foundation of Korea (NRF) Grant - Korean government (MSIT) [NRF-2018K1A3A1A13087769]
  4. joint Ukraine-Republic of Korea R&D project Properties of neutrino and weak interactions in double beta decay of 100Mo
  5. National Research Foundation of Ukraine [2020.02/0011]
  6. Ministry of Science and Higher Education of the Russian Federation, Project Fundamental properties of elementary particles and cosmology [0723-2020-0041]
  7. Ministry of Science and Higher Education of the Russian Federation [N121031700314-5]
  8. Directorate General of Higher Education of the Republic of Indonesia PMDSU scholarship

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The AMoRE-Pilot experiment is the initial phase of the AMoRE search for neutrinoless double beta decay of Mo-100, aiming to investigate the level and sources of backgrounds. By studying background events through simulations and measurements, the contributions from radioactive contaminations internal to and on the surface of the crystals or nearby materials were determined.
The Advanced Mo-based Rare process Experiment (AMoRE)-Pilot experiment is an initial phase of the AMoRE search for neutrinoless double beta decay of Mo-100, with the purpose of investigating the level and sources of backgrounds. Searches for neutrinoless double beta decay generally require ultimately low backgrounds. Surface alpha decays on the crystals themselves or nearby materials can deposit a continuum of energies that can be as high as the Q-value of the decay itself and may fall in the region of interest (ROI). To understand these background events, we studied backgrounds from radioactive contaminations internal to and on the surface of the crystals or nearby materials with Geant4-based Monte Carlo simulations. In this study, we report on the measured alpha energy spectra fitted with the corresponding simulated spectra for six crystal detectors, where sources of background contributions could be identified through high energy alpha peaks and continuum parts in the energy spectrum for both internal and surface contaminations. We determine the low-energy contributions from internal and surface alpha contaminations by extrapolating from the alpha background fitting model.

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