Experimental investigation of geologically produced antineutrinos with KamLAND
Experimental investigation of geologically produced antineutrinos with KamLAND
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DOI：
10.1038/nature03980
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发表时间：
2005-07-28
期刊：
影响因子：
64.8
通讯作者：
Piquemal, F
中科院分区：
文献类型：
--
作者：
Araki, T;Enomoto, S;Piquemal, F
探测地球中天然放射性产生的电子反中微子可以提供重要的地球物理信息。神冈液体闪烁体反中微子探测器（KamLAND）具有探测地球内部U-238和Th-232衰变产生的电子反中微子的灵敏度。地球成分模型表明，这些同位素衰变的放射性功率为16 TW，约为地球总测得的热耗散率的一半。在这里，我们提出的结果，从搜索geoneutrinos与KamLAND。假设Th/U质量浓度比为3.9，则探测到的地中微子总数的90%置信区间为4.5至54.2。这一结果与地球物理模型预测的中心值19是一致的。虽然我们目前的数据具有有限的统计能力，但它们通过直接手段提供了地球中U和Th的放射性生成能力的上限（60 TW），这是一个目前约束不佳的量。
The detection of electron antineutrinos produced by natural radioactivity in the Earth could yield important geophysical information. The Kamioka liquid scintillator antineutrino detector (KamLAND) has the sensitivity to detect electron antineutrinos produced by the decay of U-238 and Th-232 within the Earth. Earth composition models suggest that the radiogenic power from these isotope decays is 16 TW, approximately half of the total measured heat dissipation rate from the Earth. Here we present results from a search for geoneutrinos with KamLAND. Assuming a Th/U mass concentration ratio of 3.9, the 90 per cent confidence interval for the total number of geoneutrinos detected is 4.5 to 54.2. This result is consistent with the central value of 19 predicted by geophysical models. Although our present data have limited statistical power, they nevertheless provide by direct means an upper limit (60 TW) for the radiogenic power of U and Th in the Earth, a quantity that is currently poorly constrained.