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Abstract— <p>A search for the processes of double beta decay of <sup>82</sup>Se into excited states of <sup>82</sup>Kr is conducted using the OBELIX setup. The measurements are conducted using a 600 cm<sup>3</sup> HPGe detector. The detector is surrounded by 6.5 kg of enriched selenium (the content of <sup>82</sup>Se was ~92.5%). The data collected over 17 572.2 h of measurements are given. As a result, a world-record sensitivity is reached for transitions of this type. Specifically, we have found an indication of the existence of two-neutrino <sup>82</sup>Se decay into the first 0<sup>+</sup> <sup>82</sup>Kr excited state with a half-life of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11496_2025_9080_Article_IEq1.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="46" /> </InlineMediaObject> <EquationSource Format="TEX">\(4.4_{{ - 0.9}}^{{ + 1.6}}\)</EquationSource> <!--PhysPart2470237Barabash-m1--> </InlineEquation> × 10<sup>22</sup> years.</p>

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Search for Double-Beta Decay of 82Se into 82Kr Excited States Using the OBELIX Installation

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • A. S. Barabash,
  • G. Warot,
  • S. Nagorny,
  • L. Pagnanini,
  • S. Pirro,
  • D. V. Ponomarev,
  • S. V. Rozov,
  • N. I. Rukhadze,
  • Yu. A. Shitov,
  • I. Stekl,
  • T. K. Khusainov,
  • V. I. Yumatov,
  • E. A. Yakushev

摘要

Abstract—

A search for the processes of double beta decay of 82Se into excited states of 82Kr is conducted using the OBELIX setup. The measurements are conducted using a 600 cm3 HPGe detector. The detector is surrounded by 6.5 kg of enriched selenium (the content of 82Se was ~92.5%). The data collected over 17 572.2 h of measurements are given. As a result, a world-record sensitivity is reached for transitions of this type. Specifically, we have found an indication of the existence of two-neutrino 82Se decay into the first 0+ 82Kr excited state with a half-life of \(4.4_{{ - 0.9}}^{{ + 1.6}}\) × 1022 years.