Journal Article

Energy calibration of bulk events in the BULLKID detector

Cappelli, M., Caravita, R., Del Castello, G., Muscheid, T., Quaranta, D., Signorelli, G., Roda, C. M. A., Ferraro, F., Pesce, L., Monfardini, A., Malagutti, L., Bandiera, L., D’Addabbo, A., del Gallo Roccagiovine, M., Carillo, F., Crovo, D., Vázquez-Jáuregui, E., Vignati, M., Zhao, K., De Lucia, M., Ardila-Perez, L. E., Paolucci, F., Lari, T., Fu, S., Romagnoni, M., Grassi, M., Nicolò, D., Mazzolari, A., Tartari, A., Puglia, C., Simon, F., Folcarelli, M., Chowdhury, U., Roddaro, S., Pasciuto, D., Calvo, M., Cruciani, A., Gartmann, R., Acevedo-Rentería, A., Helis, D., Delicato, D., Guidi, V.

2026

Overview

BULLKID is a cryogenic, solid-state detector designed for direct searches of particle Dark Matter candidates, with mass ≲ 1 GeV/c 2 , and coherent neutrino-nucleus scattering. It is based on an array of dice carved in 5 mm thick silicon crystal, sensed by phonon-mediated Kinetic Inductance Detectors. In previous works, the array was calibrated with bursts of optical photons, which are absorbed in the first hundreds nanometers of the dice and give rise to surface events. In this work, we present the reconstruction of bulk events through the 59.5 keV γ -ray generated by an 241 Am source, which emulates more closely the interaction of Dark Matter and neutrinos. The peak resolution is 5 % ( σ ) and its position is shifted by less than 10 % with respect to the optical calibration. We observe that the resolution is further improved by a factor 2 combining the signal from neighboring dice. These results confirm the performance of the detector in view of the physics goals of the BULLKID-DM experiment for dark matter search.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V,Springer Verlag (Germany),SpringerOpen
• Subject: Aluminum / Arrays / Astronomy / Astrophysics and Cosmology / Calibration / Dark matter / Elementary Particles / Energy / Hadrons / Heavy Ions / Inductance / Instrumentation and Detectors / Measurement Science and Instrumentation / Neutrinos / Nuclear Energy / Nuclear Physics / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Regular Article - Experimental Physics / Sensors / Silicon wafers / String Theory