Abstract
The CUPID-0 detector hosted at the Laboratori Nazionali del Gran Sasso, Italy, is the first large array of enriched scintillating cryogenic detectors for the investigation of ^{82}Se neutrinoless double-beta decay (0nu beta beta ). CUPID-0 aims at measuring a background index in the region of interest (RoI) for 0nu beta beta at the level of 10^{-3} counts/(keV kg years), the lowest value ever measured using cryogenic detectors. CUPID-0 operates an array of Zn^{82}Se scintillating bolometers coupled with bolometric light detectors, with a state of the art technology for background suppression and thorough protocols and procedures for the detector preparation and construction. In this paper, the different phases of the detector design and construction will be presented, from the material selection (for the absorber production) to the new and innovative detector structure. The successful construction of the detector lead to promising preliminary detector performance which is discussed here.
Highlights
Scintillating cryogenic detectors are excellent devices for rare events investigations
One of the main challenge for generation bolometric experiments is to increase the experimental sensitivity using larger mass detectors with lower background level in the region of interest (RoI). This is the case of CUORE [4], the first-ever ton-scale bolometric experiment searching for 0νββ
In this work we describe in detail all the procedures for the realization and operation of the CUPID-0 detector, from the production of the fundamental units, the scintillating bolometers, to the processing of the thermal sensors for the signal read-out, and the surface treatment for the reduction of surface contaminations
Summary
Scintillating cryogenic detectors are excellent devices for rare events investigations. CUPID [7,8] (CUORE Upgrade with Particle IDentification) aims at developing the technology of scintillating bolometers for the realization of a generation 0νββ experiment with sensitivity of 1027–1028 years, depending on the isotope of interest. This goal establishes some technical challenges, the most relevant one is the operation of a ton of isotope with close-to-zero background level for a ton×year exposure [9] in the RoI around the ββ transition energy. This section contains a detailed description of how each detector component was selected and handled before its final installation in CUPID-0
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