Abundances of Uranium and Thorium Elements in Earth Estimated by Geoneutrino Spectroscopy

Abundances of Uranium and Thorium Elements in Earth Estimated by Geoneutrino Spectroscopy
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DOI：
10.1029/2022gl099566
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发表时间：
2022-05
期刊：
Geophysical Research Letters
影响因子：
5.2
通讯作者：
S. Abe;S. Asami;M. Eizuka;S. Futagi;A. Gando;Y. Gando;T. Gima;A. Goto;T. Hachiya;K. Hata;K. Hosokawa;K. Ichimura;S. Ieki;H. Ikeda;K. Inoue;K. Ishidoshiro;Y. Kamei;N. Kawada;Y. Kishimoto;M. Koga;M. Kurasawa;N. Maemura;T. Mitsui;H. Miyake;T. Nakahata;K. Nakamura;R. Nakamura;H. Ozaki;T. Sakai;H. Sambonsugi;I. Shimizu;Y. Shirahata;J. Shirai;K. Shiraishi;A. Suzuki;Y. Suzuki;A. Takeuchi;K. Tamae;H. Watanabe;Y. Yoshida;Shuhei Obara;A. Ichikawa;S. Yoshida;S. Umehara;K. Fushimi;K. Kotera;Y. Urano;B. Berger;B. Fujikawa;J. Learned;J. Maricic;S. Axani;Z. Fu;J. Smolsky;L. Winslow;Y. Efremenko;H. Karwowski;D. Markoff;W. Tornow;A. Li;J. Detwiler;S. Enomoto;M. Decowski;C. Grant;H. Song;T. O’Donnell;S. Dell’Oro
S. Abe;S. Asami;M. Eizuka;S. Futagi;A. Gando;Y. Gando;T. Gima;A. Goto;T. Hachiya;K. Hata;K. Hosokawa;K. Ichimura;S. Ieki;H. Ikeda;K. Inoue;K. Ishidoshiro;Y. Kamei;N. Kawada;Y. Kishimoto;M. Koga;M. Kurasawa;N. Maemura;T. Mitsui;H. Miyake;T. Nakahata;K. Nakamura;R. Nakamura;H. Ozaki;T. Sakai;H. Sambonsugi;I. Shimizu;Y. Shirahata;J. Shirai;K. Shiraishi;A. Suzuki;Y. Suzuki;A. Takeuchi;K. Tamae;H. Watanabe;Y. Yoshida;Shuhei Obara;A. Ichikawa;S. Yoshida;S. Umehara;K. Fushimi;K. Kotera;Y. Urano;B. Berger;B. Fujikawa;J. Learned;J. Maricic;S. Axani;Z. Fu;J. Smolsky;L. Winslow;Y. Efremenko;H. Karwowski;D. Markoff;W. Tornow;A. Li;J. Detwiler;S. Enomoto;M. Decowski;C. Grant;H. Song;T. O’Donnell;S. Dell’Oro
中科院分区：
地球科学1区
文献类型：
--
作者：
S. Abe;S. Asami;M. Eizuka;S. Futagi;A. Gando;Y. Gando;T. Gima;A. Goto;T. Hachiya;K. Hata;K. Hosokawa;K. Ichimura;S. Ieki;H. Ikeda;K. Inoue;K. Ishidoshiro;Y. Kamei;N. Kawada;Y. Kishimoto;M. Koga;M. Kurasawa;N. Maemura;T. Mitsui;H. Miyake;T. Nakahata;K. Nakamura;R. Nakamura;H. Ozaki;T. Sakai;H. Sambonsugi;I. Shimizu;Y. Shirahata;J. Shirai;K. Shiraishi;A. Suzuki;Y. Suzuki;A. Takeuchi;K. Tamae;H. Watanabe;Y. Yoshida;Shuhei Obara;A. Ichikawa;S. Yoshida;S. Umehara;K. Fushimi;K. Kotera;Y. Urano;B. Berger;B. Fujikawa;J. Learned;J. Maricic;S. Axani;Z. Fu;J. Smolsky;L. Winslow;Y. Efremenko;H. Karwowski;D. Markoff;W. Tornow;A. Li;J. Detwiler;S. Enomoto;M. Decowski;C. Grant;H. Song;T. O’Donnell;S. Dell’Oro

文献摘要

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原始同位素 238U、235U、232Th 和 40K 的衰变对整个地球历史上的陆地热量收支做出了贡献。因此，这些同位素的个体丰度是重建当代地球模型的关键参数。神冈液体闪烁反中微子探测器（KamLAND）观测到了铀和钍放射性衰变产生的正中微子。经过超过 18 年的观测时间，这些测量结果得到了改善，探测器背景水平的改善主要是在 8 年几乎无反应堆的时期内进行的，现在允许对中微子进行光谱分析。我们的结果对铀和钍的热量贡献产生了第一个限制。 KamLAND 结果与基于球粒陨石和地幔橄榄岩元素丰度的地球化学估计一致。 High-Q 模型不受欢迎，C.L 为 99.76%。假设地幔中产热元素分布均匀，则在 5.2σ 处排除完全放射成因模型。
The decay of the primordial isotopes 238U, 235U, 232Th, and 40K has contributed to the terrestrial heat budget throughout the Earth's history. Hence, the individual abundance of those isotopes are key parameters in reconstructing contemporary Earth models. The geoneutrinos produced by the radioactive decays of uranium and thorium have been observed with the Kamioka Liquid‐Scintillator Antineutrino Detector (KamLAND). Those measurements have been improved with more than 18‐year observation time, and improvement in detector background levels mainly with an 8‐year nearly reactor‐free period, which now permit spectroscopy with geoneutrinos. Our results yield the first constraint on both uranium and thorium heat contributions. The KamLAND result is consistent with geochemical estimations based on elemental abundances of chondritic meteorites and mantle peridotites. The High‐Q model is disfavored at 99.76% C.L. and a fully radiogenic model is excluded at 5.2σ assuming a homogeneous heat producing element distribution in the mantle.