Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session MW01: Future Prospects of Neutrinoless Double Beta Decay I & IIInvited Workshop
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Chair: Tadafumi Kishimoto, Osaka Univ; Alan Poon, Lawrence Berkeley National Laboratory Room: Hilton Waikoloa Village Kona 2-3 |
Friday, December 1, 2023 2:00PM - 2:30PM |
MW01.00001: Theoretical approaches relevant to neutrinoless double beta decay Invited Speaker: Kaori Fuyuto Search for neutrinoless double beta decay is one of the primary probes to understand the nature of neutrino mass. Its discovery implies lepton-number violation, confirming the Majorana neutrino mass which is realized by introducing sterile neutrinos. The theoretical approach requires somewhat complicated processes connecting fundamental interactions to those at hadronic and nuclear levels. In this talk, I will discuss the systematic analysis of the neutrinoless double beta decay process based on effective field theory including sterile neutrinos, and present its application to a realistic model. |
Friday, December 1, 2023 2:30PM - 3:00PM |
MW01.00002: A Survey of Neutrinoless Double Beta Decay Experiments Invited Speaker: Kate Scholberg This talk will be a big-picture overview of the current status and prospects of neutrinoless double-beta-decay search experiments worldwide, from the perspective of an interested outsider. |
Friday, December 1, 2023 3:00PM - 3:30PM |
MW01.00003: Status and Prospects of the LEGEND Experiment Invited Speaker: 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 project. LEGEND-200 has started its first physics run with an initial 142 kg of germanium diodes (101 detectors). The other 50 kg of detectors will be characterized and installed in early 2024 to reach its full mass. The second phase of the experiment, LEGEND-1000, aims to improve the discovery sensitivity by another order of magnitude with 1 tonne of large-mass, high-purity, enriched germanium detectors operated for ten years. In this talk, the status and science outlook of LEGEND will be presented, on behalf of the collaboration. |
Friday, December 1, 2023 3:30PM - 4:00PM |
MW01.00004: Results and Prospects of KamLAND-Zen Invited Speaker: Itaru Shimizu KamLAND-Zen is a double beta decay experiment that exploits the existing KamLAND neutrino detector which realizes an ultra-low background environment. The xenon-loaded liquid scintillator in a spherical nylon balloon was deployed at the center of the KamLAND detector. The first search with 381 kg of xenon (KamLAND-Zen 400) demonstrated excellent sensitivity. To enhance the sensitivity, the KamLAND-Zen detector was upgraded to larger volume containing 745 kg xenon (KamLAND-Zen 800), corresponding to a twofold increase. The data with 1 ton-year exposure are useful to investigate low-rate backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. Based on the improved analysis, KamLAND-Zen has provided the most stringent on the effective neutrino mass, and started probing the inverted mass ordering region for the first time. In the future, the KamLAND detector is planned to be upgraded to improve KamLAND2-Zen to improve the search sensitivity (KamLAND2-Zen), and R&D studies for optimizations are ongoing. |
Friday, December 1, 2023 4:00PM - 4:30PM |
MW01.00005: Searching for 0νββ decay with CUORE and CUPID Invited Speaker: Jorge Torres
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Friday, December 1, 2023 4:30PM - 5:00PM |
MW01.00006: Current status and future prospects of the CANDLES experiment Invited Speaker: Saori Umehara Neutrino-less double beta decay(0νββ) is acquiring great interest after the confirmation of neutrino oscillation which demonstrated nonzero neutrino mass. Measurement of 0νββ provides a test for the Majorana nature of neutrinos and gives an absolute scale of the effective neutrino mass. |
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