Impact of the position effects in the energy calibration of the BULLKID detector
Abstract
BULLKID is a cryogenic solid-state detector based on an array of silicon dice equipped with Kinetic Inductance Detectors (KIDs) for low-mass dark matter searches and coherent elastic neutrino-nucleus scattering. Energy calibration can be performed using optical LED photon bursts, which are absorbed within the first few hundred nanometers of the substrate. An energy calibration using a 241Am gamma-ray source revealed a <10% discrepancy with the LED calibration. A recent study by Matava and Williams suggested that phonon statistics and phonon collection varying with the interaction position could explain such a discrepancy. This work evaluates the impact of these effects on the calibration of the BULLKID detector, demonstrating they both have a negligible effect. We clarify the results obtained during the 241Am calibration regarding the origin of the observed discrepancy.
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BibTeX
@misc{folcarelli2026impact,
title = {{Impact of the position effects in the energy calibration of the BULLKID detector}},
author = {Matteo Folcarelli and Matteo Cappelli and Giorgio del Castello and Camilla Bonomo and Angelo Cruciani and Daniele Delicato and Leonardo Pesce and Davide Quaranta and Marco Vignati},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.30004},
eprint = {2609.30004},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05781777v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Impact of the position effects in the energy calibration of the BULLKID detector
AU - Matteo Folcarelli
AU - Matteo Cappelli
AU - Giorgio del Castello
AU - Camilla Bonomo
AU - Angelo Cruciani
AU - Daniele Delicato
AU - Leonardo Pesce
AU - Davide Quaranta
AU - Marco Vignati
PY - 2026
DA - 2026/09/24
PB - HAL
DO - 10.48550/arxiv.2609.30004
UR - https://hal.science/hal-05781777v1
AB - BULLKID is a cryogenic solid-state detector based on an array of silicon dice equipped with Kinetic Inductance Detectors (KIDs) for low-mass dark matter searches and coherent elastic neutrino-nucleus scattering. Energy calibration can be performed using optical LED photon bursts, which are absorbed within the first few hundred nanometers of the substrate. An energy calibration using a ^241Am gamma-ray source revealed a <10% discrepancy with the LED calibration. A recent study by Matava and Williams suggested that phonon statistics and phonon collection varying with the interaction position could explain such a discrepancy. This work evaluates the impact of these effects on the calibration of the BULLKID detector, demonstrating they both have a negligible effect. We clarify the results obtained during the ^241Am calibration regarding the origin of the observed discrepancy.
ER -