Empirical Mode Decomposition Method Was Used To Study The New Thermal Neutron Detector Data Periodically

The origin of high-energy cosmic ray is one of the basic scientific problems of cosmic ray study. Based on the accurate measurements of the individual component energy spectrum in the “knee” region, we can understand the origin of “knee” region. Then, we can solve the problem of the origin of cosmic ray. A new type thermal neutron detector array is composed of several new type thermal neutron detectors can form a detector array. This detector array focuses on the detection of cosmic ray above 100 TeV. Compared with hadronic calorimeters, the thermal neutron detector array has several advantages: lower price, easy maintenance, stable running, easy operation and easy making large area. Now, four thermal neutron detectors are running stable at Yangbajing Cosmic Ray Station, Tibet.This paper can be divided into the following three parts:Firstly, the “knee” region in cosmic ray and the detection methods of the cosmic ray are introduced. The fundamentals, the trigger mode and the method of data acquisition of the new type thermal neutron detector are studied.Secondly, the result of barometric corrections at Yangbajing Cosmic Ray Station has been analyzed. Based on the method of Empirical Mode Decomposition, we can obtain several components for different time-scales. From the curve for fortnight time-scale, we find that the periodic oscillation curve may depend on the tidal movement. In the numerical analysis, we find a peak in the curve of the neutron count rate vs time. This peak occurred during the earthquake in Nepal. We can understand our data information by analyzing this physical phenomenon.Lastly, the result of thermal neutron detector at Shijiazhuang has been analyzed. From the results of data, we can see that the detector is stable. The method of barometric corrections and the calculation method of the correlation coefficient are introduced. The influence of air pressure on neutron data can be eliminated. Using this method, we can analyze the original information of the cosmic ray.Base on the analysis of the neutron component and electron component from the thermal neutron detector, we can eliminate several influences by the method of Empirical Mode Decomposition and barometric corrections. Using the analysis results of the thermal neutron, we can obtain the information of hadron. Then, the energy spectrum of cosmic ray can be understood.