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李政道先生是世界著名的物理学家,为20世纪物理学的发展做出了重大贡献.作为炎黄子孙,李政道先生致力于发展祖国的科学事业,为我国科学事业,特别是高能物理事业的发展和人才培养呕心沥血,做出了重大的贡献.北京正负电子对撞机凝聚了李先生最多的心血,对中国高能物理和大科学装置的发展做出了巨大的贡献.从20世纪90年代中期开始,北... 相似文献
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指出1979年Kolar金矿地下实验室记录到的反常双芯事例不能如作者所提出的是由中微子或缪子所产生的,更像是由宇宙线中一个重中性粒子所产生的。 相似文献
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The Neighbor Cell Deposited Energy Ratio(NCDER) is a new method that is proposed to reconstruct incidence position in a single layer for a 3-dimensional imaging electromagnetic calorimeter(ECAL).This method was applied to reconstruct the ECAL test beam data for the Alpha Magnetic Spectrometer-02(AMS-02).The results show that this method can achieve an angular resolution of 7.36±0.08°/E~(1/2)(?)0.28±0.02o in the determination of the photon's direction,which is much more precise than that obtained with the commonly-adopted Center of Gravity(COG) method(8.4±0.1°/E~(1/2)(?)0.8±0.3o).Furthermore,since it uses only the properties of electromagnetic showers,this new method could also be used for other type of fine grain sampling calorimeters. 相似文献
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The position effect of the photoelectron multiplier tube (PMT) of the electromagnetic calorimeter (ECAL) of Alpha Magnetic Spectrometer-02 (AMS-02) has been studied with beam-test data. The reconstructed deposited energy in a layer versus incidence position in the cell can be described by Gaussian distribution, maximum and minimum value can be obtained when the particle passes across the center and the edge of a cell respectively. The distribution can be used to correct the effect of incidence position on energy reconstruction. Much better energy resolution was acquired be got with the correction, for 100 GeV electrons, energy resolution improved from 3% to 2%. 相似文献