Initial results of a direct comparison between the Surface Detectors of the Pierre Auger Observatory and of the Telescope Array

Abstract : The Pierre Auger Observatory (Auger) in Mendoza, Argentina and the Telescope Array (TA) in Utah, USA aim at unraveling the origin and nature of Ultra-High Energy Cosmic Rays (UHECR). At present, there appear to be subtle differences between Auger and TA results and interpretations. Joint working groups have been established and have already reported preliminary findings. From an experimental standpoint, the Surface Detectors (SD) of both experiments make use of different detection processes not equally sensitive to the components of the extensive air showers making it to the ground. In particular, the muonic component of the shower measured at ground level can be traced back to the primary composition, which is critical for understanding the origin of UHECRs. In order to make direct comparisons between the SD detection techniques used by Auger and TA, a joint SD experimental research program is being developed. In the first phase, two Auger SD stations were deployed at the TA Central Laser Facility to compare station-level responses. This paper concentrates on the results obtained with the first Auger SD station (an “Auger North” design), which has been operating since October 2014. The second Auger SD station, identical to the ones being operated at Auger in Argentina (an “Auger South” design), was just deployed in June 2015. The second phase of this research program will be to co-locate six Auger North SD stations with TA stations in the field to compare event-level responses.
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Communication dans un congrès
34th International Cosmic Ray Conference, Jul 2015, The Hague, Netherlands. PoS, ICRC2015, pp.393, 2016, 〈10.22323/1.236.0393〉
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https://hal.archives-ouvertes.fr/hal-01553911
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Soumis le : lundi 3 juillet 2017 - 17:31:40
Dernière modification le : mardi 9 octobre 2018 - 16:16:34

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Ryuji Takeishi, R. R. Cady, T. Nonaka, S. Ogio, H. Sagawa, et al.. Initial results of a direct comparison between the Surface Detectors of the Pierre Auger Observatory and of the Telescope Array. 34th International Cosmic Ray Conference, Jul 2015, The Hague, Netherlands. PoS, ICRC2015, pp.393, 2016, 〈10.22323/1.236.0393〉. 〈hal-01553911〉

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