Energy, time, and position resolution measurements of an array of large tapered LYSO crystals
Abstract
We report on the performance of six custom-made tapered LYSO crystals of unprecedented volume, which constitute a sector of the 19 radiation length electromagnetic calorimeter planned for the PIONEER experiment. The longitudinal response uniformity of each crystal was measured using radioactive sources before characterizing the energy and time resolution of the crystals in an array using a 20 to 80 MeV positron beam at the Paul Scherrer Institute. The array demonstrated an energy resolution better than 2 % for energies above 40 MeV and a time resolution better than 140 ps for energies above 30 MeV. The spatial resolution was measured in the central region of the array to be 5.06 mm in x and 5.20 mm in y at 70 MeV. The measured properties satisfy the key design parameters of the PIONEER calorimeter for the measurement of rare pion decays.
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BibTeX
@misc{beesley2026energy,
title = {{Energy, time, and position resolution measurements of an array of large tapered LYSO crystals}},
author = {O. Beesley and J. Carlton and D. Ding and S. Foster and K. Frahm and T. Frank and L. Gibbons and D. Goeldi and T. Gorringe and D. W. Hertzog and S. Hochrein and J. Hui and E. Klemets and J. LaBounty and J. Liu and P. Lopez Maggi and W. Osar and R. Roehnelt and P. Schwendimann and W. Shuai and A. Soter and E. Swanson},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2607.09226},
eprint = {2607.09226},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.09226},
}
RIS
TY - UNPB
TI - Energy, time, and position resolution measurements of an array of large tapered LYSO crystals
AU - O. Beesley
AU - J. Carlton
AU - D. Ding
AU - S. Foster
AU - K. Frahm
AU - T. Frank
AU - L. Gibbons
AU - D. Goeldi
AU - T. Gorringe
AU - D. W. Hertzog
AU - S. Hochrein
AU - J. Hui
AU - E. Klemets
AU - J. LaBounty
AU - J. Liu
AU - P. Lopez Maggi
AU - W. Osar
AU - R. Roehnelt
AU - P. Schwendimann
AU - W. Shuai
AU - A. Soter
AU - E. Swanson
PY - 2026
DA - 2026/10/05
PB - arXiv
DO - 10.48550/arxiv.2607.09226
UR - https://arxiv.org/abs/2607.09226
AB - We report on the performance of six custom-made tapered LYSO crystals of unprecedented volume, which constitute a sector of the 19 radiation length electromagnetic calorimeter planned for the PIONEER experiment. The longitudinal response uniformity of each crystal was measured using radioactive sources before characterizing the energy and time resolution of the crystals in an array using a 20 to 80 MeV positron beam at the Paul Scherrer Institute. The array demonstrated an energy resolution better than 2 % for energies above 40 MeV and a time resolution better than 140 ps for energies above 30 MeV. The spatial resolution was measured in the central region of the array to be 5.06 mm in x and 5.20 mm in y at 70 MeV. The measured properties satisfy the key design parameters of the PIONEER calorimeter for the measurement of rare pion decays.
ER -