PHYSICS / PARTICLE PHYSICS

LR-NEUTRINOLESS-DOUBLE-BETA-HALF-LIFE-LIMITOPEN LIMIT

Strongest lower limit on the neutrinoless double-beta decay half-life

Name: Strongest lower limit on the neutrinoless double-beta decay half-life
Creator: Limits Registry
Published: 2023-01-31T00:00:00.000Z
Keywords: PHYSICS / PARTICLE PHYSICS

KamLAND-Zen, a xenon-loaded liquid scintillator detector in the Kamioka mine in Japan, reported in Physical Review Letters in 2023 that the neutrinoless double-beta decay half-life of xenon-136 exceeds 2.3x10^26 years. Observing the decay would prove neutrinos are their own antiparticles (Majorana particles); the limit first probed the inverted neutrino-mass-ordering region.

— page viewsSpecification version 1Published 2023-01-311 evidence records

About this problem

The question, scope, and sources behind this Registry record.

Description

Formal question

The largest published lower bound on the half-life of neutrinoless double-beta decay in any isotope.

Scope & constraints

Current published specification applies.

Primary sources

KamLAND-Zen Collaboration, 'Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region', PRL 130, 051801 — Strongest lower limit on the neutrinoless double-beta decay half-life Kamioka Observatory, Gifu, Japan

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Scope matches the published specificationNo parameters changed

What we know

Current frontiers derived from accepted Claims.

Best demonstrated value2.3e26

An observed or demonstrated result; no opposing bound is implied.

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Claims

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2026

CLM-NEUTRINOLESS-DOUBLE-BETA-HALF-LIFE-LIMIT= 2.3e26CONSTRUCTIONSearch for a monoenergetic peak at the 136Xe Q-value (2.458 MeV) in about 745 kg of enriched xenon dissolved in liquid scintillator, with background vetoing of cosmogenic and radioactive events.Evidence quality: PAPER · Source: KamLAND-Zen Collaboration, 'Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region', PRL 130, 051801 — Strongest lower limit on the neutrinoless double-beta decay half-life ↗

SOURCE CONFIRMED

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How this frontier is derived

Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.

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Strongest lower limit on the neutrinoless double-beta decay half-life

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Strongest lower limit on the neutrinoless double-beta decay half-life

About this problem

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