講演情報
[SGC46-05]地球ニュートリノのグローバル観測によるマントル放射性物質濃度の推定
*許 智豪1、欧陽 帥2、William F. McDonough3,4,5、渡辺 寛子1、Mark Chen6、張 洋2、Laura S. Keen7 (1.東北大学ニュートリノ科学研究センター、2.山東大学、3.東北大学・海洋研究開発機構 変動海洋エコシステム高等研究所、4.マリーランド大学カレッジパーク校、5.中国科学院海洋研究所地球ニュートリノ研究センター、6.クィーンズ大学、7.The MathWorks, Inc.)
キーワード：
地球ニュートリノ、マントル、放射性物質、地熱、ウラン、トリウム
Geoneutrinos are the electron antineutrinos produced by beta decays of radioactive isotopes within the Earth. Their detection acts as a unique tool to probe the planet's radiogenic heat production and the distribution of heat-producing elements (HPEs) in the Earth. However, due to their extremely small mass and weak interactions, geoneutrinos are incredibly challenging to detect.
Nevertheless, in 2005, the KamLAND experiment (Japan) became the first ever to successfully detect geoneutrinos, providing groundbreaking insights into the earth's interior. The achievement spurred the development of new methods for studying the earth's structure, bridging neutrino physics with geochemistry and geophysics. After that, the Borexino experiment (Italy) confirmed geoneutrino detection in 2007. Most recently, in 2025, the SNO+ (Canada) and JUNO (China) experiments released their first geoneutrino detection results, marking the beginning of a true multi-site global observational era.
In this presentation, we utilize this expanded global dataset to estimate the abundance of mantle HPEs. By performing a combined analysis of the latest results from KamLAND, Borexino, SNO+, and JUNO, we aim to statistically isolate the mantle signal from the crustal contribution. Specifically, we discuss the implications of our results for the Earth's total radiogenic heat budget and test the consistency of different Bulk Silicate Earth (BSE) models.
Nevertheless, in 2005, the KamLAND experiment (Japan) became the first ever to successfully detect geoneutrinos, providing groundbreaking insights into the earth's interior. The achievement spurred the development of new methods for studying the earth's structure, bridging neutrino physics with geochemistry and geophysics. After that, the Borexino experiment (Italy) confirmed geoneutrino detection in 2007. Most recently, in 2025, the SNO+ (Canada) and JUNO (China) experiments released their first geoneutrino detection results, marking the beginning of a true multi-site global observational era.
In this presentation, we utilize this expanded global dataset to estimate the abundance of mantle HPEs. By performing a combined analysis of the latest results from KamLAND, Borexino, SNO+, and JUNO, we aim to statistically isolate the mantle signal from the crustal contribution. Specifically, we discuss the implications of our results for the Earth's total radiogenic heat budget and test the consistency of different Bulk Silicate Earth (BSE) models.