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DTSTART:20220313T100000
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DTSTART;TZID=America/Los_Angeles:20220513T120000
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DTSTAMP:20260428T081237
CREATED:20220513T181648Z
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UID:1190-1652443200-1652446800@inpa.lbl.gov
SUMMARY:Christopher Grant (University of Boston) - New Results from KamLAND-Zen 800 with Nearly a Ton-Year Exposure of Xe-136
DESCRIPTION:KamLAND-Zen is searching for neutrinoless double-beta (0νββ) decay in Xe-136 using a xenon-loaded liquid scintillator.  The KamLAND-Zen detector was recently upgraded with almost double the amount of xenon and an ultra-low radioactivity container.  With almost 1-ton-year of Xe-136 exposure\, we are exploring the double-beta decay parameter space corresponding to the inverted hierarchy for the first time.  We have not yet observed NDBD\, but these results make use of novel algorithms to perform beta-gamma separation using ML and tag spallation products on day-long time scales.  We obtain a lower limit for the 0νββ decay half-life of 2.3×10^26 yr at 90% C.L.\, corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations.
URL:https://inpa.lbl.gov/event/christopher-grant-university-of-boston-new-results-from-kamland-zen-800-with-nearly-a-ton-year-exposure-of-xe-136/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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