HiRes and TA Composition measurements

Yuichiro Tameda

doi:10.1051/epjconf/20135304005

EPJ

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Proceedings

Open Access

EPJ Web of Conferences 53, 04005 (2013)
https://doi.org/10.1051/epjconf/20135304005

HiRes and TA Composition measurements

Yuichiro Tameda^a for the Telescope Array and HiRes Collaboration^b

Institute for Cosmic Ray Research, the University of Tokyo, Kashiwa, Chiba, Japan

^a e-mail: tame@icrr.utokyo.ac.jp

Abstract

In order to clarify the origin of ultra high energy cosmic rays (UHECRs), it is very important to determine the mass composition. The most effective strategy to determine the mass composition is X_max technique. X_max is the atmospheric depth of air shower maximum measured by fluorescence detectors (FDs). HiRes has reported X_max measurement by FDs which indicated proton dominated mass composition. Now, Telescope Array (TA) experiment has also measured UHECRs with FDs. In this presentation, the detail of mass composition analysis and result of TA experiment will be reported and compared with HiRes experiment.

For the full authorlist see Appendix “Collaborations” in this volume.

© Owned by the authors, published by EDP Sciences, 2013

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.