Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session 1WJB: Future Prospects of Neutrinoless Double Beta Decay II |
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Chair: Kevin Lesko, Lawrence Berkeley National Laboratory Room: Hilton Kona 5 |
Tuesday, October 23, 2018 11:00AM - 11:30AM |
1WJB.00001: Status of the CUORE and prospects for CUPID Invited Speaker: Thomas Michael O'Donnell The Cryogenic Underground Observatory for Rare Events (CUORE) is an array of 988 TeO$_{2}$ cryogenic bolometers designed to search for neutrinoless double-beta ($0\nu\beta\beta$) decay of $^{130}$Te and other rare decays. The detector began science data taking in Spring 2017. With an active mass of 742 kg operating at a temperature close to 10 mk, CUORE is unprecedented in size for this technology and its successful operation is a major milestone for the future of bolometers. In this talk we will discuss the latest results and progress of the experiment. The planned science program aims to accumulate five years of live-time at which point we expect to achieve a 90\% C.L lower limit sensitivity on the $^{130}$Te $0\nu\beta\beta$ decay half life of $9.0\times 10^{25}$~yr. With this sensitivity CUORE will begin to probe the inverted hierarchy of neutrino masses for certain nuclear matrix elements. Beyond CUORE, we will discuss the CUPID initiative (CUORE Upgrade with Particle IDentification) which aims to realize a next-generation experiment exploiting improved bolometers in order to fully probe the inverted hierarchy. In particular we will discuss valuable insights gained from CUORE data and R\&D prototypes towards achieving this goal. |
Tuesday, October 23, 2018 11:30AM - 12:00PM |
1WJB.00002: LEGEND --- a 76Ge-based ton-scale neutrinoless double-beta decay experiment Invited Speaker: Ralph J Massarczyk The seesaw mechanism can explain the small but finite neutrino masses and if neutrinos are Majorana particles, i.e. they are their own antiparticles. The observation of neutrinoless double-beta decay (0νββ) would prove in a model independent way that neutrinos are Majorana particles and show that lepton number is violated. Under the assumption of a light neutrino exchange, an experiment approaching 0νββ half-life of 1028 years will be able to cover the inverted hierarchy. Such an experiment requires, beside a ton-scale target, excellent energy resolution and an extremely low background level of ~0.1 count/(FWHM·t·yr) in the region of interest. The current-generation experiments - GERDA, and the MAJORANA DEMONSTRATOR - utilize p-type point contact detectors that are highly-enriched in 76Ge, and have achieved the best intrinsic energy resolution and the lowest background in the signal region. These achievements were realized by placing the experiments deep underground, careful selection of construction and shielding materials, minimizing the exposure of the enriched germanium from cosmic-ray activation, and the use of an active veto for in-situ background rejection. Building on these successes, a new international collaboration - LEGEND (Large Enriched Germanium Experiment for Neutrinoless ββ Decay) - has been formed to pursue a ton-scale 76Ge experiment [1]. It aims to develop a phased experimental program with the discovery potential reaching a half-life of 1028 years or longer. In the first 200-kg phase, LEGEND will use existing resources as appropriate to expedite physics results. In this talk, I will present the results from ongoing efforts, and give an overview on the planning, development and execution of the LEGEND experimental program. [1] N. Abgrall et al, https://arxiv.org/pdf/1709.01980 |
Tuesday, October 23, 2018 12:00PM - 12:30PM |
1WJB.00003: The nEXO experiment Invited Speaker: Mike Heffner Development of large liquid noble element time projection chambers |
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