Abstract
The ARGO-YBJ experiment is an Extensive Air Shower array that has been operated at the high altitude Yangbajing Cosmic Ray Laboratory (Tibet, P.R. China 4300 m a.s.l.) in its final configuration since December 2007 until February 2013. The detector consists of a dense layer of Resistive Plate Counters (RPCs) covering an area of about 11000 m2. It has been designed to measure the temporal and spatial structure of Extensive Air Showers (EAS) with high space-time resolution. The detector gives a quite highly detailed picture of shower footprints at ground. It is perfectly suitable to understand the EAS morphology. These detector characteristics have been used for seeking particles of large rest mass produced in cosmic rays by measuring the Multiple Shell Shower Fronts relative delays. The technique and preliminary results will be illustrated in the present work.
Highlights
The ARGO-YBJ experiment (Astrophysical Radiation with Ground-based Observatory at YangBajing) has been designed to study cosmic rays and cosmic γ -radiation at energy larger than few hundreds GeV, by detecting air showers at high altitude with wide-aperture and high duty cycle
The apparatus is a single layer detector logically divided into 153 units called clusters (7.6×5.7 m2), each made of 12 Resistive Plate Counters (RPCs) operating in streamer mode
Each RPC is read out using 10 pads (61.8×55.6 cm2), which are further divided into 8 pick-up strips providing a larger particle counting dynamic range
Summary
The ARGO-YBJ experiment (Astrophysical Radiation with Ground-based Observatory at YangBajing) has been designed to study cosmic rays and cosmic γ -radiation at energy larger than few hundreds GeV, by detecting air showers at high altitude with wide-aperture and high duty cycle. Pads are the time elemental units for measuring the pattern of the shower front with time resolution of ∼ 1.8 ns and the limitation that during 90 ns, for each pad, only the first hit can be recorded, while the multiplicity can be saturated without time limitations. This aspect limits the time study in a very dense area of the shower such as few meters around the shower core. ARGO-YBJ allows a complete and detailed three-dimensional reconstruction of the shower front with unprecedented spatial and time resolution.[1,2,3,4]
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