Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session L20: Neutrinos IV - Neutrinoless Double-Beta Decay: ProspectsFocus Live
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Sponsoring Units: DNP Chair: Krishna Kumar, University of Massachusetts Amherst Room: Washington 5 |
Sunday, April 19, 2020 3:30PM - 3:42PM Live |
L20.00001: SNO+: Results and Prospects Logan Lebanowski SNO+ is a multipurpose neutrino experiment located 2 km underground in a Canadian mine. The primary goal is a high-sensitivity search for neutrinoless double beta decay using $^{130}$Te-loaded scintillator, but SNO+ can also measure reactor, solar, geo, and supernova neutrinos. Having completed data acquisition with a water target, SNO+ has measured the flux of $^{8}$B solar neutrinos with low backgrounds and set world-leading limits on invisible (di)nucleon decays. These analyses are being updated with data that provide more than twice the livetime and have lower rates of radioactive backgrounds. SNO+ is currently filling with scintillator (LAB+PPO) and Te loading is scheduled to begin later this year. [Preview Abstract] |
Sunday, April 19, 2020 3:42PM - 3:54PM Live |
L20.00002: Low Tc IrPt TES Light Detectors for CUPID Bradford Welliver, Whitney Armstrong, Giovanni Benato, Clarence Chang, Brian Fujikawa, Kawtar Hafidi, Raul Hennings-Yeomans, Roger Huang, Goran Karapetrov, Yury Kolomensky, Charles Li, Marharyta Lisovenko, Laura Marini, Zein-Eddine Meziani, Valentine Novosad, John Pearson, Tomas Polakovic, Benjamin Schmidt, Vivek Singh, Sachinthya Wagaarachchi, Gensheng Wang, Volodymyr Yefremenko, Jianjie Zhang The Cryogenic Underground Observatory for Rare Events (CUORE) is currently searching for lepton number violating physics at the Laboratori Nazionali del Gran Sasso (LNGS). CUORE is comprised of 988 TeO2 crystals operated as cryogenic bolometers with NTD Ge thermistors. The CUORE Upgrade with Particle ID (CUPID) experiment will aim to improve upon the CUORE background by a factor of 1000 and will have event by event discrimination for $\alpha$ and $\beta$ interactions in the crystal. This will be accomplished via the collection of both heat and scintillation light signals. In order to meet the timing and energy resolution requirements, low-Tc transition edge sensors (TES) are a promising technology to use. This talk presents the status of ongoing R&D in developing a novel IrPt bilayer TES to use as a light detector. [Preview Abstract] |
Sunday, April 19, 2020 3:54PM - 4:06PM Live |
L20.00003: Results from the CUPID-Mo experiment for a next-generation 0$\nu\beta\beta$ search with CUPID Benjamin Schmidt CUPID (CUORE Upgrade with Particle ID) is a next-generation effort to probe 0$\nu \beta \beta$-decay in the so-called inverted mass hierarchy region with $^{100}$Mo. It builds on the infrastructure of the currently operating first ton-scale cryogenic bolometer experiment CUORE, the Cryogenic Underground Observatory for Rare Events. The proposed technology for CUPID is employed in the CUPID-Mo experiment searching for 0$\nu \beta \beta$ of $^{100}$Mo at the Laboratoire Souterrain de Modane (France). This demonstrator consists of an array of 20 enriched ~0.2 kg Li$_2$MoO$_4$ crystals complemented by 20 cryogenic Ge bolometers to distinguish $\alpha$ from $\beta$/$\gamma$ events by the detection of both heat and scintillation light signals. In this talk, we will present results from the data taken in 2019, confirming an excellent bolometric performance of down to $\sim$5-6 keV energy resolution (FWHM) at 2615 keV, full $\alpha$ to $\beta$/$\gamma$ separation and excellent radio-purity levels of relevant isotopes of the U/Th series of typically less than 1 $\mu$Bq/kg in bulk contaminants. We will conclude with an update on the acquired statistics of the experiment and an expectation of the sensitivity of the blind 0$\nu \beta \beta$ analysis with CUPID-Mo data in 2020. [Preview Abstract] |
Sunday, April 19, 2020 4:06PM - 4:18PM Live |
L20.00004: Status of LEGEND - Progress on LEGEND-200 and Outlook towards ton-scale Ralph Massarczyk The Large Enriched Germanium Experiment for Neutrinoless $\beta\beta$ Decay (LEGEND) is an experimental effort to search for neutrinoless double-beta decay in $^{76}$Ge. Using a phased approach, the collaboration aims to develop an experimental program with the discovery potential reaching a half-life beyond 10$^{28}$ years. \\ In the first 200-kg phase, LEGEND will use existing resources as appropriate to expedite physics results. I will give an overview and status report on LEGEND-200 whose first test and commissioning phase will start this year. Furthermore, my talk will have an outlook on LEGEND-1000, and the physics reach of the ton-scale effort. An overview will be given on the various ongoing R\&D e fforts which are needed to reach the desired sensitivity. [Preview Abstract] |
Sunday, April 19, 2020 4:18PM - 4:30PM Live |
L20.00005: Background Rejection through Pulse Shape Discrimination in the Majorana Demonstrator Nicholas Ruof The Majorana Demonstrator is an experiment searching for neutrinoless double-beta decay in $^{\mathrm{76}}$Ge. The experiment consists of two modular arrays with 44.8 kg of high purity Germanium detectors operating at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota. P-type point contact detector technology allows for the identification and rejection of specific background event populations through an analysis of pulse shape characteristics. Relating the amplitude (A) of the current pulse and the total energy(E) collected defines an AvsE pulse shape parameter. We present the performance and improvements to our multi-site Compton-scattered gamma background rejection with the AvsE cut parameter, systematics concerning the cut, and show its influence on the sensitivity of the experiment. [Preview Abstract] |
Sunday, April 19, 2020 4:30PM - 4:42PM |
L20.00006: Searching for Neutrinoless Double Beta Decay in CUORE using Multi-Site events Sachinthya Wagaarachchi The Cryogenic Underground Observatory for Rare Events (CUORE) is a ton scale experimental search for 0$\nu\beta\beta$ decay on ${}^{130}$Te. The CUORE detector consists of 988 TeO$_2$ crystals operating as cryogenic bolometers at the Gran Sasso National Laboratory (LNGS) in Italy. Most current results from CUORE uses 372.5 kg.yr of analyzed exposure that has been collected over the past 3 years. While simulations suggests that about 11\% of 0$\nu\beta\beta$ decay events will deposit energy in more than one location, these results come only from the analysis of single site events. In this talk we present preliminary analysis and updated sensitivity projections using multi-site events that deposit energy in more than one crystal, including the our techniques for estimating the correct background shapes and systematic effects. [Preview Abstract] |
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