Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session DD: Mini-Symposium: The Physics of Double Beta Decay - Experiments |
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Chair: Thomas O'Donnell, Virginia Tech Room: Hyatt Regency Hotel Celestin B |
Friday, October 28, 2022 8:30AM - 9:06AM |
DD.00001: The Search for Neutrinoless Double-Beta Decay with KamLAND-Zen 800 Invited Speaker: Lindley A Winslow The KamLAND-Zen experiment has recently provided stringent constraints on the neutrinoless double-beta decay half-life in 136Xe using a xenon-loaded liquid scintillator. I will present the analysis of a data set with an unprecedented exposure of 970 kg yr of 136Xe. This new data provides valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and has required the use of novel background rejection techniques including machine learning. |
Friday, October 28, 2022 9:06AM - 9:18AM |
DD.00002: Latest Results from the CUORE Experiment and Analysis Plans for Two Tonne-Years of Exposure Kenneth Vetter The Cryogenic Underground Observatory for Rare Events (CUORE) experiment is an ongoing search for neutrinoless double beta decay ($0\nu\beta\beta$) located at the Gran Sasso National Laboratory (LNGS) in Italy. With a detector mass of 742 kg and an operating temperature of approximately 10 mK, it is the coldest cubic meter in the known universe. Over the course of a four-year measurement campaign, the CUORE experiment has obtained over one tonne-year (1000 kg-years) of TeO$_2$ exposure, allowing us to conduct a high-sensitivity search for $0\nu\beta\beta$ and set a lower bound of the process half-life at $2.2\times10^{25}$ years (90\% C.I.). In this talk, I will give a brief overview of the CUORE experiment and discuss the results after one tonne-year of exposure. I will then discuss the ongoing effort to improve the analysis framework in preparation for the next analysis with two tonne-years of exposure. In particular, I will showcase results of noise decorrelation algorithms including the expected impact on the energy resolution of the CUORE detector for the two tonne-year dataset. |
Friday, October 28, 2022 9:18AM - 9:30AM |
DD.00003: CUPID: a next-generation neutrinoless double-beta decay experiment Jorge Torres
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Friday, October 28, 2022 9:30AM - 9:42AM |
DD.00004: Toward CUPID-1T: a bolometric experiment to explore 0νββ in the Normal Ordering region Erin V Hansen Current experiments to search for broken lepton-number symmetry through the observation of neutrinoless double-beta decay (0νββ) provide the most stringent limits on the Majorana nature of neutrinos and the effective Majorana neutrino mass (mββ). CUORE Upgrade with Particle IDentification (CUPID) is a next-generation search for neutrinoless double-beta decay which will use light from cryogenic calorimeters to tag particles by their heat-to-light signal ratio. CUPID will focus on sensitivity to the 0νββ half-life of O(1027 years) and mββ∼15meV, which would provide complete coverage of the Inverted Ordering region of the neutrino mass parameter space. |
Friday, October 28, 2022 9:42AM - 9:54AM |
DD.00005: Searching for neutrinoless double beta decay using the nEXO detector Evan Angelico The observation of neutrinoless double-beta decay (0vbb) always implies new physics. The nEXO detector, a 5 ton-scale liquid xenon time projection chamber enriched to 90% in the isotope 136Xe, plans to observe this groundbreaking phenomenon, producing first data in 2029. It is a monolithic volume of xenon with many attenuation lengths of radioactive backgrounds between the central region of nEXO and its vessel. The nEXO detector is designed such that no single component dominates its radioactive background, and each low radioactivity material has an identified vendor or source. Its projected sensitivity is robust against backgrounds and “unknown unknowns” due to the use of multiple observables for signal-to-background discrimination, one of which is an order 1% resolution measurement of energy at the 0vbb Q-value. These factors result in an estimated discovery potential for 0vbb at 0.74 x 1028 year half-life at 3σ significance after 10 years. This talk will provide an overview of nEXO as well as a summary of the diverse range of R&D efforts presently underway. |
Friday, October 28, 2022 9:54AM - 10:06AM |
DD.00006: Neutrinoless double-beta decay search with LEGEND-200 Ann-Kathrin Schuetz The Large Enriched Germanium Experiment for Neutrinoless double-beta Decay (LEGEND) project will search for the lepton-number-violating neutrinoless double-beta (0νββ) decay of 76Ge. This discovery would have far-reaching implications in cosmology and particle physics, such as establishing the Majorana nature of the neutrino and constraining the neutrino mass scale in the picture of light-neutrino exchange. Using High Purity Germanium (HPGe) detectors enriched in the isotope 76Ge and directly immersed into liquid argon (LAr), LEGEND exploits the combination of superior energy resolution of germanium detectors and scintillating properties of LAr crucial for background reduction. The first phase, LEGEND-200, comprises 200 kg of 76Ge-enriched detectors and is presently under construction at LNGS in Italy. It will serve as a testbed for technology improvements and as an intermediate step to the tonne-scale LEGEND-1000 project. LEGEND-200 aims to reach a half-life sensitivity of 1027 years, an improvement of one order of magnitude on the latest limits, with a factor of 2.5 background index reduction. This talk presents the physics reach of LEGEND-200, new technologies deployed, and reports on the status of the ongoing commissioning. |
Friday, October 28, 2022 10:06AM - 10:18AM |
DD.00007: Searching for 0vbb Decay with High Pressure Xenon Gas Time Projection Chambers Leslie Rogers Finding evidence of neutrinoless double beta decay would reveal the Majorana nature of the neutrino and give insight into the origins of the matter-antimatter asymmetry in the universe, the smallness of neutrino mass, and the symmetry structure of the Standard Model. The NEXT collaboration is developing a sequence of high pressure xenon gas time projection chambers with the aim of creating a ton-scale, very low background neutrinoless double beta decay search. In this talk, I will highlight the strengths of this program, including recent results from the NEXT-White demonstrator, status of NEXT-100, and prospects for ton-scale and beyond R&D and experiments |
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