论文标题
地球估计的地球中铀和th元素的丰度
Abundances of uranium and thorium elements in Earth estimated by geoneutrino spectroscopy
论文作者
论文摘要
The decay of the primordial isotopes $^{238}\mathrm{U}$, $^{235}\mathrm{U}$, $^{232}\mathrm{Th}$, and $^{40}\mathrm{K}$ have contributed to the terrestrial heat budget throughout the Earth's history.因此，这些同位素的个人丰度是重建当代地球模型的关键参数。 Kamioka液体史氨基抗神经探测器（Kamland）观察到了由铀和th的放射性衰变产生的地球植物。随着18年的观察时间，这些测量结果得到了改进，并且探测器背景水平的改善主要是在8年的几乎无校长期间，现在可以使用地球植物学的光谱法。我们的结果对铀和the热贡献产生了第一个限制。本文中的kamland结果与基于软骨陨石和地幔橄榄岩的元素丰度的地球化学估计一致。高Q模型在99.76％C.L.不利。假设地幔中的热量产生元件分布，则在5.2 $σ$上排除了完全放射原模型。
The decay of the primordial isotopes $^{238}\mathrm{U}$, $^{235}\mathrm{U}$, $^{232}\mathrm{Th}$, and $^{40}\mathrm{K}$ have 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 model. 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 improvements in detector background levels mainly by an 8-year almost rector-free period now permit spectroscopy with geoneutrinos. Our results yield the first constraint on both uranium and thorium heat contributions. Herein 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 5.2$σ$ assuming a homogeneous heat producing element distribution in the mantle.
