地球中微子能谱计算及初步高阶修正  

Calculation and Preliminary High-order Correction of Geo-neutrino Energy Spectrum

作　　者：冒鑫 韩然[1] 李玉峰[2] MAO Xin;HAN Ran;LI Yufeng(National Key Laboratory of Science and Technology on Reliability and Environmental Engineering,Beijing Institute of Spacecraft Environment Engineering,Beijing 100094,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]北京卫星环境工程研究所可靠性与环境工程技术国防科技重点实验室,北京100094 [2]中国科学院高能物理研究所,北京100049

出　　处：《原子能科学技术》2020年第8期1345-1354,共10页Atomic Energy Science and Technology

基　　金：国家重点研发计划资助项目(2018YFA0404104)。

摘　　要：地球中微子是目前实验测量放射性生热及探索地球内部结构最好的媒介之一,而能谱是其通量预测及本底分析的前提条件。通过计算238 U和232 Th衰变链中分别对应的113和83个β衰变谱并归一化叠加,得到了这两种同位素的地球中微子能谱,较目前常用的能谱使用了更多的衰变道信息。为提高能谱的精度,对能谱加入了形状、辐射、弱磁共4项高阶修正,修正量最大达8.5%,经过修正的能谱可用于地球中微子的精确预测及分析。Geo-neutrino is one of the best messengers for experimentally measuring radiogenic power and exploring the Earth’s interior.Energy spectrum is the prerequisite for predicting the geo-neutrino flux and analyzing backgrounds.By calculating and summing up the normalizedβdecay spectra of 113 transitions in 238 U chain and 83 transitions in 232 Th chain,the energy spectra for these two isotopes were obtained.The spectra were calculated with more beta transitions compared with the commonly used spectra at present.To improve the accuracy,four high-order corrections including the finite size correction,radioactive correction,and weak magnetism correction were considered.The biggest correction size reaches 8.5%.The corrected spectra can be used for accurate prediction and analysis of geo-neutrinos.

关 键 词：地球中微子 放射性生热元素 能谱 高阶修正 

分 类 号：O572.2[理学—粒子物理与原子核物理]