https://doi.org/10.1140/epjc/s10052-024-12714-9
Letter
Low-energy spectrum of the BULLKID detector array operated on surface
1
Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000, Grenoble, France
2
Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 2, 00185, Rome, Italy
3
INFN-Sezione di Roma, Piazzale Aldo Moro 2, 00185, Rome, Italy
4
Dipartimento di Ingegneria Meccanica e Aerospaziale, Sapienza Università di Roma, Via Eudossiana 18, 00184, Rome, Italy
5
INFN-Sezione di Ferrara, via Saragat 1, 44121, Ferrara, Italy
6
Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Via Saragat 1, 44100, Ferrara, Italy
7
Dipartimento di Neuroscienze e Riabilitazione, Università di Ferrara, Via Luigi Borsari 46, 44121, Ferrara, Italy
a
daniele.delicato@roma1.infn.it
Received:
27
November
2023
Accepted:
19
March
2024
Published online:
3
April
2024
We present the first continuous operation in a surface lab of BULLKID, a detector for searches of light Dark Matter and precision measurements of the coherent and elastic neutrino-nucleus scattering. The detector consists of an array of 60 cubic silicon particle absorbers of 0.34 g each, sensed by cryogenic kinetic inductance detectors. The data presented focusses on one of the central elements of the array and on its surrounding elements used as veto. The energy spectrum resulting from an exposure of 39 h to ambient backgrounds, obtained without radiation shields, is flat at the level of counts/keV kg days down to the energy threshold of
eV. The data analysis demonstrates the unique capability of rejecting backgrounds generated from interactions in other sites of the array, stemming from the segmented and monolithic structure of the detector.
© The Author(s) 2024
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Funded by SCOAP3.