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In rare-event searches, a comprehensive understanding and effective mitigation of backgrounds are essential, especially for Coherent Elastic Neutrino-Nucleus Scattering (CE \(\nu \) NS) experiments using a nuclear reactor. The sensitivity of these experiments is primarily determined by the background level. The most challenging background for a CE \(\nu \) NS experiment comes from secondary particles produced by cosmic muons, as these can induce electron/nuclear recoils within the detector’s fiducial volume. This work presents a detailed study of a high-purity germanium (HPGe) cryogenic detector, and evaluates the rate of these secondary backgrounds up to 30 \(\mathrm {keV_{ee}}\) , originating from lead and copper shielding, using a timing coincidence technique.

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Measurement of Cosmic Muon-Induced Low-Energy Gamma Background with a HPGe Detector for CE \({\nu }\) NS Experiment in India

  • 会议论文

  • 发表日期：

    2025年

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  • Roni Dey,
  • Dipanwita Mondal,
  • Sudipta Das,
  • Varchaswi K. S. Kashyap,
  • Bedangadas Mohanty

摘要

In rare-event searches, a comprehensive understanding and effective mitigation of backgrounds are essential, especially for Coherent Elastic Neutrino-Nucleus Scattering (CE \(\nu \) NS) experiments using a nuclear reactor. The sensitivity of these experiments is primarily determined by the background level. The most challenging background for a CE \(\nu \) NS experiment comes from secondary particles produced by cosmic muons, as these can induce electron/nuclear recoils within the detector’s fiducial volume. This work presents a detailed study of a high-purity germanium (HPGe) cryogenic detector, and evaluates the rate of these secondary backgrounds up to 30 \(\mathrm {keV_{ee}}\) , originating from lead and copper shielding, using a timing coincidence technique.