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Probing Earth's Missing Potassium using the Unique Antimatter Signature of Geoneutrinos

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arxiv 2308.04154 v2 pith:XHM7TXOM submitted 2023-08-08 physics.geo-ph hep-exphysics.ins-det

Probing Earth's Missing Potassium using the Unique Antimatter Signature of Geoneutrinos

classification physics.geo-ph hep-exphysics.ins-det
keywords potassiumearthgeoneutrinosdetectionantimatterbeencompletedirect
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The formation of the Earth remains an epoch with mysterious puzzles extending to our still incomplete understanding of the planet's potential origin and bulk composition. Direct confirmation of the Earth's internal heat engine was accomplished by the successful observation of geoneutrinos originating from uranium (U) and thorium (Th) progenies, manifestations of the planet's natural radioactivity dominated by potassium (40K) and the decay chains of uranium (238U) and thorium (232Th). This radiogenic energy output is critical to planetary dynamics and must be accurately measured for a complete understanding of the overall heat budget and thermal history of the Earth. Detecting geoneutrinos remains the only direct probe to do so and constitutes a challenging objective in modern neutrino physics. In particular, the intriguing potassium geoneutrinos have never been observed and thus far have been considered impractical to measure. We propose here a novel approach for potassium geoneutrino detection using the unique antimatter signature of antineutrinos to reduce the otherwise overwhelming backgrounds to observing this rarest signal. The proposed detection framework relies on the innovative LiquidO detection technique to enable positron (e+) identification and antineutrino interactions with ideal isotope targets identified here for the first time. We also provide the complete experimental methodology to yield the first potassium geoneutrino discovery.

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