Cosmic-ray helium nuclei measurement with the calorimeter of the Alpha Magnetic Spectrometer  

作　　者：Feng-ze Zhang Zhi-Cheng Tang Zu-Hao Li Cheng Zhang Ze-Tong Sun Jia-Yu Hu Shang-Lin Li Guo-Ming Chen He-Sheng Chen 

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Radiation Detection Technology and Methods》2022年第3期427-432,共6页辐射探测技术与方法（英文）

基　　金：funding was provided by China Sponsorship Council(Grant Number:202004910534).

摘　　要：Purpose The distributions of energy responses of helium measured by the electromagnetic calorimeter(ECAL)of Alpha Magnetic Spectrometer(AMS-02)in Monte-Carlo do not agree with those in real data,thus using energy response matrix obtained from Monte-Carlo to measure the cosmic ray helium spectrum is not correct.Therefore,the spectrum measured with ECAL based on raw Monte-Carlo would be different from the real one.The purpose is to correct the response matrix to measure helium spectrum with ECAL.Methods The energy measured by ECAL of AMS-02 provides in-flight correction for the energy response matrix in Monte-Carlo.Results The spectrum based on corrected response matrix is consistent with the AMS collaboration published result.Conclusions It is feasible to measure helium spectrum with ECAL with corrected energy response matrix.

关 键 词：Cosmic rays Helium spectrum Electromagnetic calorimeter Monte Carlo simulation Fig.1 a The structure of ECAL b The indication of PMTs in one superlayer 

分 类 号：O57[理学—粒子物理与原子核物理]