Development of Yangbajing air shower core detector for a new EAS hybrid experiment

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LIU Jin-Sheng, HUANG Jing, CHEN Ding, ZHANG Ying, ZHAI Liu-Ming, CHEN Xu, HU Xiao-Bin, LIN Yu-Hui, ZHANG Xue-Yao, FENG Cun-Feng, JIA Huan-Yu, ZHOU Xun-Xiu, CHEN Tian-Lu, LI Hai-Jin, LIU Mao-Yuan, YUAN Ai-Fang and Development of Yangbajing air shower core detector for a new EAS hybrid experiment[J]. Chinese Physics C, 2015, 39(8): 086004. doi: 10.1088/1674-1137/39/8/086004
LIU Jin-Sheng, HUANG Jing, CHEN Ding, ZHANG Ying, ZHAI Liu-Ming, CHEN Xu, HU Xiao-Bin, LIN Yu-Hui, ZHANG Xue-Yao, FENG Cun-Feng, JIA Huan-Yu, ZHOU Xun-Xiu, CHEN Tian-Lu, LI Hai-Jin, LIU Mao-Yuan, YUAN Ai-Fang and Development of Yangbajing air shower core detector for a new EAS hybrid experiment[J]. Chinese Physics C, 2015, 39(8): 086004.  doi: 10.1088/1674-1137/39/8/086004 shu
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Received: 2015-01-27
Revised: 1900-01-01
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Development of Yangbajing air shower core detector for a new EAS hybrid experiment

    Corresponding author: LIU Jin-Sheng,

Abstract: Aiming at the observation of cosmic-ray chemical composition in the "knee" energy region, we have been developing a new type of air-shower core detector (YAC, Yangbajing Air shower Core detector array) to be set up at Yangbajing (90.522° E, 30.102° N, 4300 m above sea level, atmospheric depth: 606 g/m2) in Tibet, China. YAC works together with the Tibet air-shower array (Tibet-Ⅲ) and an underground water Cherenkov muon detector array (MD) as a hybrid experiment. Each YAC detector unit consists of lead plates of 3.5 cm thickness and a scintillation counter which detects the burst size induced by high energy particles in the air-shower cores. The burst size can be measured from 1 MIP (Minimum Ionization Particle) to 106 MIPs. The first phase of this experiment, named "YAC-Ⅰ", consists of 16 YAC detectors each with a size of 40 cm×50 cm and distributed in a grid with an effective area of 10 m2. YAC-Ⅰ is used to check hadronic interaction models. The second phase of the experiment, called "YAC-Ⅱ", consists of 124 YAC detectors with coverage of about 500 m2. The inner 100 detectors of 80 cm× 50 cm each are deployed in a 10×10 matrix with a 1.9 separation; the outer 24 detectors of 100 cm×50 cm each are distributed around these to reject non-core events whose shower cores are far from the YAC-Ⅱ array. YAC-Ⅱ is used to study the primary cosmic-ray composition, in particular, to obtain the energy spectra of protons, helium and iron nuclei between 5×1013 eV and 1016 eV, covering the "knee" and also connected with direct observations at energies around 100 TeV. We present the design and performance of YAC-Ⅱ in this paper.

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