Correlation between thermal neutrons and soil moisture measured by ENDA
Correlation between thermal neutrons and soil moisture measured by ENDA
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DOI：
10.1088/1748-0221/18/05/p05020
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发表时间：
2023-05
影响因子：
1.3
通讯作者：
F. Yang;X. Ma;H.-K. Chen;T. Chen;S. Cui;Danzengluobu;W. Gao;D. Kuleshov;K. Kurinov;B. Li;M. Liu;Y. Liu;O. Shchegolev;Y. Stenkin;Di-Xuan Xiao;L. Yin;L. Zhang
中科院分区：
文献类型：
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作者：
F. Yang;X. Ma;H.-K. Chen;T. Chen;S. Cui;Danzengluobu;W. Gao;D. Kuleshov;K. Kurinov;B. Li;M. Liu;Y. Liu;O. Shchegolev;Y. Stenkin;Di-Xuan Xiao;L. Yin;L. Zhang
强子是广延空气簇射（EAS）的骨架。它们具有关于宇宙射线的成分和能量的有利信息。电子中子探测器（EN探测器）可以探测到地面中EAS强子产生的热中子以及EAS前平面中的带电粒子。在大型高空空气簇射天文台（LHAASO）上建立了ENDA探测器阵列（ENDA-16）的原型，以测试其对宇宙线成分和能谱的探测性能。在以往的工作中已经证明，在雨季探测到的热中子是减少的。为了定量评估土壤湿度对热中子的影响，在ENDA-16的中心安装了五个土壤湿度计来记录土壤湿度。热中子计数率与土壤含水量呈负相关。此外，它表明，土壤深度0.5米以上的土壤水分传感器是足够的监测热中子计数率和土壤水分之间的负相关性。研究结果为在ENDA实验中对实验数据进行雨季修正，降低热中子测量的系统不确定度提供了一种方法。
Hadrons are the “skeleton” of extensive air shower (EAS). They possess favorable information concerning composition and energy of cosmic ray. Thermal neutrons generated by the EAS hadrons in the ground as well as charged particles in EAS front plane can be detected by Electron-Neutron detector (EN-detector). A prototype of EN-Detector Array (ENDA), ENDA-16 was built at Large High Altitude Air Shower Observatory (LHAASO) to test its performance of detection of cosmic ray composition and energy spectrum. It has been proved in former work that there is a decrease of thermal neutrons detected in rainy season. For quantitative evaluation of influence of soil moisture on thermal neutrons, at the center of ENDA-16, five soil moisture meters are installed to record soil moisture. Negative correlation between thermal neutron counting rate and soil moisture is obtained. Moreover, it is demonstrated that a soil depth 0.5 m over the soil moisture sensor is enough for monitoring negative correlation between thermal neutron counting rate and soil moisture. The results provide us a method to correct the experimental data during the rainy season so as to reduce systematic uncertainty of thermal neutron measurement in the ENDA experiment.