Impact of the position effects in the energy calibration of the BULLKID detector
Matteo Folcarelli, Matteo Cappelli, Giorgio Del Castello, Camilla Bonomo, Angelo Cruciani, Daniele Delicato, Leonardo Pesce, Davide Quaranta, Marco Vignati
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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