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We report on the measurement of the two-neutrino double-beta decay half-life of [Formula omitted]Te with the CUORE-0 detector. From an exposure of 33.4 kg year of TeO [Formula omitted], the half-life is determined to be [Formula omitted] = [8.2 ± 0.2 (stat.) ± 0.6 (syst.)] [Formula omitted] 10 [Formula omitted] year. This result is obtained after a detailed reconstruction of the sources responsible for the CUORE-0 counting rate, with a specific study of those contributing to the [Formula omitted]Te neutrinoless double-beta decay region of interest.

We report on the measurement of the two-neutrino double-beta decay half-life of 130 Te with the CUORE-0 detector. From an exposure of 33.4 kg year of TeO 2 , the half-life is determined to be T 1 / 2 2 ν = [8.2 ± 0.2 (stat.) ± 0.6 (syst.)] × 10 20  year. This result is obtained after a detailed reconstruction of the sources responsible for the CUORE-0 counting rate, with a specific study of those contributing to the 130 Te neutrinoless double-beta decay region of interest.

CUPID, the CUORE Upgrade with Particle Identification, is a next-generation experiment to search for neutrinoless double beta decay (0νββ) and other rare events using enriched Li2 100MoO4 scintillating bolometers. It will be hosted by the CUORE cryostat located at the Laboratori Nazionali del Gran Sasso in Italy. The main physics goal of CUPID is to search for 0νββ of 100Mo with a discovery sensitivity covering the full neutrino mass regime in the inverted ordering scenario, as well as the portion of the normal ordering regime with lightest neutrino mass larger than 10 meV. With a conservative background index of 10−4 cts/(keV·kg·yr), 240 kg isotope mass, 5 keV FWHM energy resolution at 3 MeV and 10 live-years of data taking, CUPID will have a 90% C.L. half-life exclusion sensitivity of 1.8 · 1027 yr, corresponding to an effective Majorana neutrino mass (mββ) sensitivity of 9–15 meV, and a 3σ discovery sensitivity of 1 · 1027 yr, corresponding to an mββ range of 12–21 meV.

Neutrinoless double beta decay ( 0 ν β β ) is one of the most sensitive probes for physics beyond the Standard Model, providing unique information on the nature of neutrinos. In this paper we review the status and outlook for bolometric 0 ν β β  decay searches. We summarize recent advances in background suppression demonstrated using bolometers with simultaneous readout of heat and light signals. We simulate several configurations of a future CUORE-like bolometer array which would utilize these improvements and present the sensitivity reach of a hypothetical next-generation bolometric 0 ν β β  experiment. We demonstrate that a bolometric experiment with the isotope mass of about 1 ton is capable of reaching the sensitivity to the effective Majorana neutrino mass ( | m e e | ) of order 10–20 meV, thus completely exploring the so-called inverted neutrino mass hierarchy region. We highlight the main challenges and identify priorities for an R&D program addressing them.

We present the analysis techniques developed to explore the keV-scale energy region of the CUORE experiment, based on more than 2 tonne yr of data collected over 5 years. By prioritizing a stricter selection over a larger exposure, we are able to optimize data selection for thresholds at 10 keV and 3 keV with 691 kg yr and 11 kg yr of data, respectively. We study how the performance varies among the 988-detector array with different detector characteristics and data taking conditions. We achieve an average baseline resolution of 2.54 \\(\\pm\\) 0.14 keV FWHM and 1.18 \\(\\pm\\) 0.02 keV FWHM for the data selection at 10 keV and 3 keV, respectively. The analysis methods employed reduce the overall background by about an order of magnitude, reaching 2.06 \\(\\pm\\) 0.05 counts/(keV kg days) and 16 \\(\\pm\\) 2 counts/(keV kg days) at the thresholds of 10 keV and 3 keV. We evaluate for the first time the near-threshold reconstruction efficiencies of the CUORE experiment, and find these to be 26 \\(\\pm\\) 4 \\% and 50 \\(\\pm\\) 2 \\% at 3 keV and 10 keV, respectively. This analysis provides crucial insights into rare decay studies, new physics searches, and keV-scale background modeling with CUORE. We demonstrate that tonne-scale cryogenic calorimeters can operate across a wide energy range, from keV to MeV, establishing their scalability as versatile detectors for rare event and dark matter physics. These findings also inform the optimization of future large mass cryogenic calorimeters to enhance the sensitivity to low-energy phenomena.

Superconductivity, 2E is an encyclopedic treatment of all aspects of the subject, from classic materials to fullerenes.Emphasis is on balanced coverage, with a comprehensive reference list and significant graphicsfrom all areas of the published literature.Widely used theoretical approaches are explained in detail.

Matter-antimatter asymmetry underlines the incompleteness of the current understanding of particle physics. Neutrinoless double-beta decay (\\(0 \\)) may help explain this asymmetry, while unveiling the Majorana nature of the neutrino. The CUORE experiment searches for \\(0 \\) of \\(^130\\)Te using a tonne-scale cryogenic calorimeter operated at milli-kelvin temperatures. We report no evidence of \\(0 \\) and place a lower limit on the half-life of \\(T_1/2 >3.5 \\) 10\\(^25\\)~years (90\\% C.I.) with over 2~tonne\\(\\)year TeO\\(_2\\) exposure. The tools and techniques developed for this result and the 5 year stable operation of nearly 1000 detectors demonstrate crucial infrastructure for a future-generation experiment capable of searching for \\(0 \\) across multiple isotopes.

We report a study of the CUORE sensitivity to neutrinoless double beta ( 0 ν β β ) decay. We used a Bayesian analysis based on a toy Monte Carlo (MC) approach to extract the exclusion sensitivity to the 0 ν β β decay half-life ( T 1 / 2 0 ν ) at 90 %  credibility interval (CI) – i.e. the interval containing the true value of T 1 / 2 0 ν with 90 % probability – and the 3 σ discovery sensitivity. We consider various background levels and energy resolutions, and describe the influence of the data division in subsets with different background levels. If the background level and the energy resolution meet the expectation, CUORE will reach a 90 %  CI exclusion sensitivity of 2 · 10 25  year with 3 months, and 9 · 10 25  year with 5 years of live time. Under the same conditions, the discovery sensitivity after 3 months and 5 years will be 7 · 10 24  year and 4 · 10 25  year, respectively.

We present the model we developed to reconstruct the CUORE radioactive background based on the analysis of an experimental exposure of 1038.4 kg yr. The data reconstruction relies on a simultaneous Bayesian fit applied to energy spectra over a broad energy range. The high granularity of the CUORE detector, together with the large exposure and extended stable operations, allow for an in-depth exploration of both spatial and time dependence of backgrounds. We achieve high sensitivity to both bulk and surface activities of the materials of the setup, detecting levels as low as 10 nBq kg\\(^-1\\) and 0.1 nBq cm\\(^-2\\), respectively. We compare the contamination levels we extract from the background model with prior radio-assay data, which informs future background risk mitigation strategies. The results of this background model play a crucial role in constructing the background budget for the CUPID experiment as it will exploit the same CUORE infrastructure.

We report on a search for double beta decay of \\[^{130}\\hbox {Te}\\] to the first \\[0^{+}\\] excited state of \\[^{130}\\hbox {Xe}\\] using a \\[9.8\\,\\hbox {kg}\\cdot \\hbox {yr}\\] exposure of \\[^{130}\\hbox {Te}\\] collected with the CUORE-0 experiment. In this work we exploit different topologies of coincident events to search for both the neutrinoless and two-neutrino double beta decay modes. We find no evidence for either mode and place lower bounds on the half-lives: \\[T^{0\\nu }_{0^+_1}>7.9\\cdot 10^{23}\\hbox {yr}\\] and \\[T^{2\\nu }_{0^+_1}>2.4\\cdot 10^{23}\\hbox {yr}\\] (\\[90\\%\\,\\hbox {CL}\\]). Combining our results with those obtained by the CUORICINO experiment, we achieve the most stringent constraints available for these processes: \\[T^{0\\nu }_{0^+_1}>1.4\\cdot 10^{24}\\hbox {yr}\\] and \\[T^{2\\nu }_{0^+_1}>2.5\\cdot 10^{23}\\hbox {yr}\\] (\\[90\\%\\,\\hbox {CL}\\]).