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PreprintarXiv licencearXiv

Optimization and Underground Implementation of the KAPAE Phase II Detector for an Invisible New Particle Search in Positronium Decay

  • Dongwoo Jeong
  • Jaeyoung Cho
  • Doohyeok Lee
  • Jaehyeok Kim
  • HyeoungWoo Park
  • Yun-Tao Wu
  • H. J. Kim
Open at sourcePDFDOICite

Abstract

The KAPAE Phase II detector was developed to search for invisible decays of positronium as a probe of physics beyond the Standard Model. The detector geometry was optimized with Geant4 simulations, and the scintillation and readout performance were evaluated experimentally. The temperature dependence of the BGO scintillator and several readout configurations were studied to find the operating condition giving the best energy resolution. The background level was then measured both at the surface and underground. At the surface, the positron-gamma coincidence background was of order 1 Hz, with occasional bursts up to about 65 Hz. Underground, it decreased to below about 3 \times 10^{-4} Hz, more than three orders of magnitude lower.

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Cite

BibTeXRIS
BibTeX
@misc{jeong2026optimization,
  title = {{Optimization and Underground Implementation of the KAPAE Phase II Detector for an Invisible New Particle Search in Positronium Decay}},
  author = {Dongwoo Jeong and Jaeyoung Cho and Doohyeok Lee and Jaehyeok Kim and HyeoungWoo Park and Yun-Tao Wu and H. J. Kim},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.10259},
  eprint = {2609.10259},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.10259},
}
RIS
TY  - UNPB
TI  - Optimization and Underground Implementation of the KAPAE Phase II Detector for an Invisible New Particle Search in Positronium Decay
AU  - Dongwoo Jeong
AU  - Jaeyoung Cho
AU  - Doohyeok Lee
AU  - Jaehyeok Kim
AU  - HyeoungWoo Park
AU  - Yun-Tao Wu
AU  - H. J. Kim
PY  - 2026
DA  - 2026/09/09
PB  - arXiv
DO  - 10.48550/arxiv.2609.10259
UR  - https://arxiv.org/abs/2609.10259
AB  - The KAPAE Phase II detector was developed to search for invisible decays of positronium as a probe of physics beyond the Standard Model. The detector geometry was optimized with Geant4 simulations, and the scintillation and readout performance were evaluated experimentally. The temperature dependence of the BGO scintillator and several readout configurations were studied to find the operating condition giving the best energy resolution. The background level was then measured both at the surface and underground. At the surface, the positron-gamma coincidence background was of order 1 Hz, with occasional bursts up to about 65 Hz. Underground, it decreased to below about 3 \times 10^{-4} Hz, more than three orders of magnitude lower.
ER  -