Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session G12: Neutrinoless Double Beta Decay IIIRecordings Available
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Sponsoring Units: DNP Chair: Wenqin Xu, University of South Dakota Room: Shubert |
Sunday, April 10, 2022 8:30AM - 8:42AM |
G12.00001: Invisible tri-nucleon decay in ^{130}Te with CUORE Vivek Sharma The conservation of baryon number in the Standard Model stems from an empirical symmetry, and does not arise from first principles. An indication of this symmetry being broken would have far reaching consequences for our understanding of the universe, and can lead us to address important questions, such as the origins of the matter-antimatter asymmetry. A hypothesized process which can violate baryon number is the tri-nucleon decay, which involves three nucleons decaying simultaneously. This process is expected to produce unstable daughter isotopes, the decay of which can be looked for as evidence of this process. In this talk we discuss the search for tri-nucleon decay in ^{130}Te with CUORE using the delayed decay of daughter isotopes . We will present the details on the search signal, the associated backgrounds and the analysis techniques employed. |
Sunday, April 10, 2022 8:42AM - 8:54AM |
G12.00002: Low-temperature optical photon detectors for the CUPID experiment. Vivek Singh, Clarence L Chang, Brian K Fujikawa, Yury G Kolomensky, Marharyta Lisovenko, Valentyn Novosad, Gensheng Wang, Bradford C Welliver, Volodymyr G Yefremenko, Jianjie Zhang, Mattia Beretta, Erin Hansen, Kenneth Vetter, Chiara Capelli, Enectali Figueroa, Benjamin Schmidt, Valentina Novati, Ran Chen CUPID is a proposed next-generation experiment that will search for neutrinoless double-β (0νββ) decay in 100Mo using ~1600 Li2100MoO4 scintillating crystals operated as low-temperature calorimeters close to ∼10mK. It will leverage the crystal's energy loss mechanism to tag particle type by simultaneously measuring thermal and scintillation signals. We will use an auxiliary low-temperature calorimeter to detect light with high photon collection efficiency. The light detectors must have a very low energy threshold ??(100eV) and good timing resolution < 0.17 μs to tag α background and 2νββ pile-up events in the region of interest. The light detectors are crucial to reach the CUPID background goal of <1E-4 counts/(keV.kg.yr) for its baseline design. In this talk, I will briefly discuss the baseline design of the CUPID light detectors and the R&D status of a future upgrade with transition-edge sensor (TES) based light detectors which may further help suppress the pile-up background. This work will present the detector's energy and timing resolution performance and its response to optical photons and x-rays. |
Sunday, April 10, 2022 8:54AM - 9:06AM |
G12.00003: Optical Simulations for the Muon Veto System for CUPID Iris D Ponce CUPID, the CUORE Upgrade with Particle IDentification, is a proposed upgrade to CUORE, a ton-scale bolometric experiment in search of neutrinoless double-beta decay (0νββ). CUPID aims to decrease their experimental backgrounds by a factor of a 100 compared to CUORE which will result in a 10 times improvement in the half-life sensitivity. In order to reduce the cosmogenic backgrounds CUPID will implement a muon veto system consisting of scintillator panels and read out with SiPMs. A high light collection is important in order to distinguish muons from other backgrounds. This talk will focus on the simulations being developed to optimize the scintillating panel design to maximize the light collection for the muon veto system. |
Sunday, April 10, 2022 9:06AM - 9:18AM |
G12.00004: Estimate of 42Ar production underground Sagar Sharma Poudel I will present our estimate of the rate of 42Ar production underground by nuclear processes. Radioactive decays from 42Ar, and its progeny 42K, are potential background sources in large-scale liquid-argon-based neutrino and dark matter experiments. In the atmosphere, 42Ar is produced primarily by cosmogenic activation on 40Ar. DarkSide-20k, the only experiment to use underground argon (UAr), found no conclusive evidence of 42Ar in UAr. There has been little study on underground production mechanisms of 42Ar and the expected production rates. In this talk, I will discuss 42Ar production underground by nuclear reactions induced by natural radioactivity and cosmic-ray muon interactions. I will present our estimate of the 42Ar production rate at various depths in the continental crust. |
Sunday, April 10, 2022 9:18AM - 9:30AM |
G12.00005: Evaluation of cosmogenic production of 39Ar and 42Ar for rare-event physics using underground argon chao zhang, Dongming Mei Underground argon with lower cosmogenic activities of 39Ar and 42Ar has been planned as a detector in detecting scintillation light for dark matter searches and as a veto detector in suppressing backgrounds for neutrinoless double beta decay experiments. Long-lived radioactive isotopes, 39Ar and 42Ar can also be produced on the surface when underground argon is pumped out from underground. Understanding the production of long-lived isotopes in argon is important for utilizing underground argon for dark matter and neutrinoless double-beat decay experiments in terms of its production, transport, and storage. Argon exposure to cosmic rays at sea-level are simulated using Geant4 for a given cosmic neutron, muon and proton energy spectrum. |
Sunday, April 10, 2022 9:30AM - 9:42AM |
G12.00006: Measurement of the total neutron cross section on argon in the 30 to 70 keV energy range Tyler J Erjavec, Robert Svoboda, Jingbo Wang, Luca Pagani, Emilija Pantic, Michael Mulhearn, Yashwanth Bezawada, Junying Huang, Sofia Andringa, John L Ullmann, Julie He, Paul E Koehler, Michael Mocko, Leon ` Pickard The use of liquid argon as a detection and shielding medium for neutrino and dark matter experiments has made the precise knowledge of the cross section for neutron interactions on argon an important design and operational parameter. Nevertheless, there has been a lingering discrepancy between the total cross-section in the 30-70 keV region given in the Evaluated Nuclear Data File (ENDF) and the single measurement done in the 1990's by an experiment optimized for higher energy. This discrepancy is significant in that the former predicts a large negative resonance in the region while the measurement did not report such a feature, giving rise to significant uncertainty in the penetration depth of neutrons through liquid argon. This talk presents results from the Argon Resonant Transport Interaction Experiment (ARTIE) at the Los Alamos Neutron Science Center (LANSCE), the first dedicated experiment optimized for this energy region. The ARTIE measurement of the total cross-section as a function of energy confirms the existence of a negative resonance in this region, but not quite as deep as the ENDF prediction. |
Sunday, April 10, 2022 9:42AM - 9:54AM |
G12.00007: Development of a 127Xe calibration source for nEXO Clarke Hardy The nEXO experiment is a planned tonne-scale liquid xenon time projection chamber (TPC) to search for neutrinoless double beta decay of 136Xe with a half-life sensitivity beyond 1028 years. For optimal energy resolution in nEXO, the position- and time- dependent detector response must be calibrated to sufficient precision. Dissolved sources which mix uniformly throughout the TPC are being considered as an alternative to external gamma sources for this purpose. In this talk I will describe the development of a dissolved 127Xe source for nEXO, including a demonstration of its use for electron lifetime calibrations in a test TPC. I will also show projections of the precision with which such a source could be used to calibrate the charge and light response in nEXO. |
Sunday, April 10, 2022 9:54AM - 10:06AM |
G12.00008: The NEXT-CRAB-0 Optical TPC Prototype Jacqueline Baeza-Rubio The NEXT collaboration is developing a sequence of large, high pressure xenon gas time projection chambers to search for the neutrinoless double beta decay of 136Xe. Existing NEXT detectors use a PMT energy plane and a SiPM-based topological tracking plane on opposite sides of the vessel. This talk will describe an augmentation of the NEXT concept implementing an external camera readout tracking plane via high-speed cameras and VUV image intensified optics, called NEXT-CRAB (Camera Readout and Barium Tagging). The CRAB-0 prototype at UTA aims to implement the camera readout technique at small scale, informing the optical system design for a larger demonstrator system currently under construction at Argonne National Lab. This talk will present the first results from NEXT-CRAB-0 and plans for NEXT-CRAB. |
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