2019
DOI: 10.1103/physrevlett.123.032501
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Final Result of CUPID-0 Phase-I in the Search for the Se82 Neutrinoless Double- β Decay

Abstract: CUPID-0 is the first pilot experiment of CUPID, a next-generation project for the measurement of neutrinoless double beta decay (0νDBD) with scintillating bolometers. The detector, consisting of 24 enriched and 2 natural ZnSe crystals, has been taking data at Laboratori Nazionali del Gran Sasso from June 2017 to December 2018, collecting a 82 Se exposure of 5.29 kg×yr. In this paper we present the phase-I results in the search for 0νDBD. We demonstrate that the technology implemented by CUPID-0 allows us to re… Show more

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Cited by 104 publications
(103 citation statements)
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“…We expect to achieve a 5 keV energy resolution (FWHM) at Q β β with a dedicated optimization of the energy reconstruction algorithms. With an average containment efficiency for 0νβ β decay events of 75%, and assuming a ∼ 90% analysis efficiency, as obtained in CUORE [14] and CUPID-0 [27] for the combined trigger efficiency, multiplicity, pulse shape analysis (PSA) and RLY cut efficiencies we obtain the exclusion sensitivity curves reported in Fig. 18.…”
Section: Radiopurity Of LI 2 100 Moo 4 Crystalsmentioning
confidence: 99%
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“…We expect to achieve a 5 keV energy resolution (FWHM) at Q β β with a dedicated optimization of the energy reconstruction algorithms. With an average containment efficiency for 0νβ β decay events of 75%, and assuming a ∼ 90% analysis efficiency, as obtained in CUORE [14] and CUPID-0 [27] for the combined trigger efficiency, multiplicity, pulse shape analysis (PSA) and RLY cut efficiencies we obtain the exclusion sensitivity curves reported in Fig. 18.…”
Section: Radiopurity Of LI 2 100 Moo 4 Crystalsmentioning
confidence: 99%
“…With an exposure of ∼10 kg×yr, CUPID-0 proved that dual readout could suppress the dominant α background to a negligible level, obtaining the lowest background level for a bolometric experiment to date [26]. Nevertheless, the radiopurity and energy resolution (20.05±0.34 keV FWHM at Q β β ) of the CUPID-0 crystals [26,27] do not meet the requirements of CUPID and demand further R&D activity if Zn 82 Se were to be used.…”
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confidence: 99%
“…To evaluate the effects of this possible contamination, a test has been performed including 90 Sr in the list of sources. As reported in [15], the energy calibration is affected by bias evaluated over all the interest energies. To control the effects of this bias on the current analysis, an evaluation of the obtained limit is performed using the corrected energy scale.…”
Section: Fig 1 Comparison Between Standard (Black) Andmentioning
confidence: 99%
“…The dual heat/light readout allows us to combine the excellent energy resolution of bolometers with the background rejection capabilities of scintillators. Indeed, CUPID-0 reached the lowest background ever measured in a 0νββ bolometric detector, setting the most stringent limits in the search of the 82 Se 0νββ to the fundamental and excited states of 82 Kr [14][15][16]. A comprehensive background model has also been developed for CUPID-0 [17], evaluating and localizing all the possible sources of background for the detector.…”
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confidence: 99%
“…The uncertainty on the energy scale is investigated exploiting a dedicated calibration with a 56 Co source. The distribution of residuals shows a parabolic dependence on energy, with a maximum deviation from zero of 3 keV between 511 keV and the 2νββ -decay endpoint at 3 MeV [31]. We take into account this effect by adding to the nominal energy of each event the corresponding residual, evaluated from the distribution.…”
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confidence: 99%