Performance of an LYSO-Based Active Converter for a Conversion Spectrometer aiming for 52.8 MeV photon detection in Future $μ^+ \to e^+ γ$ Search Experiments

Fuente: arXiv

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Bibliographic Details
Main Authors:	Ban, Sei, Gerritzen, Lukas, Ikeda, Fumihito, Iwamoto, Toshiyuki, Ootani, Wataru, Oya, Atsushi, Sakakibara, Rei, Yokota, Rintaro
Format:	Preprint
Published:	2025
Subjects:	Instrumentation and Detectors High Energy Physics - Experiment
Online Access:	Acceder al recurso
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_version_	1866911730334957568
author	Ban, Sei Gerritzen, Lukas Ikeda, Fumihito Iwamoto, Toshiyuki Ootani, Wataru Oya, Atsushi Sakakibara, Rei Yokota, Rintaro
author_facet	Ban, Sei Gerritzen, Lukas Ikeda, Fumihito Iwamoto, Toshiyuki Ootani, Wataru Oya, Atsushi Sakakibara, Rei Yokota, Rintaro
contents	To facilitate future $μ^+ \to e^+ γ$ search experiments with a branching-ratio sensitivity of $10^{-15}$, we are developing a conversion spectrometer that incorporates an active LYSO converter. The converter generates $e^+e^-$ pairs from incident photons while simultaneously measuring their energy deposition and timing, thereby enabling precise reconstruction of 52.8 MeV photons. The design goals include a time resolution of 30 ps and an energy resolution of 200 keV for the detection of 52.8 MeV photons. Based on simulation studies, we optimized the converter thickness and segment dimensions, followed by the fabrication of prototype LYSO segments. The single-MIP detection performance of these prototypes was evaluated using an electron beam at the KEK PF-AR test beamline. The prototypes demonstrated excellent performance, achieving a time resolution of 25 ps and a light yield of $10^4$ photoelectrons, both of which significantly exceed the design requirements.
format	Preprint
id	arxiv_https___arxiv_org_abs_2512_24209
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Performance of an LYSO-Based Active Converter for a Conversion Spectrometer aiming for 52.8 MeV photon detection in Future $μ^+ \to e^+ γ$ Search Experiments Ban, Sei Gerritzen, Lukas Ikeda, Fumihito Iwamoto, Toshiyuki Ootani, Wataru Oya, Atsushi Sakakibara, Rei Yokota, Rintaro Instrumentation and Detectors High Energy Physics - Experiment To facilitate future $μ^+ \to e^+ γ$ search experiments with a branching-ratio sensitivity of $10^{-15}$, we are developing a conversion spectrometer that incorporates an active LYSO converter. The converter generates $e^+e^-$ pairs from incident photons while simultaneously measuring their energy deposition and timing, thereby enabling precise reconstruction of 52.8 MeV photons. The design goals include a time resolution of 30 ps and an energy resolution of 200 keV for the detection of 52.8 MeV photons. Based on simulation studies, we optimized the converter thickness and segment dimensions, followed by the fabrication of prototype LYSO segments. The single-MIP detection performance of these prototypes was evaluated using an electron beam at the KEK PF-AR test beamline. The prototypes demonstrated excellent performance, achieving a time resolution of 25 ps and a light yield of $10^4$ photoelectrons, both of which significantly exceed the design requirements.
title	Performance of an LYSO-Based Active Converter for a Conversion Spectrometer aiming for 52.8 MeV photon detection in Future $μ^+ \to e^+ γ$ Search Experiments
topic	Instrumentation and Detectors High Energy Physics - Experiment
url	https://arxiv.org/abs/2512.24209