We have started a new hybrid air shower experiment in Yangbajing (4300 m a.s.l.) in Tibet since February 2014. This new hybrid experiment consists of the YAC-II comprised of 124 core detectors placed in the form of a square grid of 1.9 m spacing covering about 500 m2, the Tibet-III AS array with the total area of about 50,000 m2 and the undergroundMDarray consists of 80 cells, with the total area of ∼4,500 m2. This hybrid-array system is used to observe air showers of high energy celestial gamma-ray origin and those of nuclear-component origin. Prototype experiment YAC-I was successfully carried out in 2009-2010 together with Tibet-III air-shower array. In this paper, performance of YAC-II and the preliminary results of YAC-I are presented.
|Publication status||Published - 2015|
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