Abstract

The Telescope Array (TA) experiment is measuring cosmic rays of energies from PeV to 100 EeV and higher in the Northern hemisphere. TA has two parts: main TA and the TA low energy extension (TALE). Main TA is a hybrid detector that consists of 507 plastic scintillation counters on a 1200m - spaced square grid that are overlooked by three fluorescence detector stations. TALE is also a hybrid detector that consists of additional fluorescence telescopes arranged to view higher elevations and an infill array of 103 plastic scintillation counters. In this work, we describe the combined TA surface detector (SD) and TALE fluorescence detector spectrum, check the calculation of the TA SD spectrum at the highest energies using an alternative, Constant Intensity Cut, method and discuss the declination dependence of the TA SD spectrum at the highest energies. Details of the TALE spectrum calculation have been presented in a separate work at this conference.

Highlights

  • Energy spectrum is an important tool in cosmic ray physics

  • We have provided a combined Telescope Array (TA) spectrum measurement using the most recent results of the TA surface detector (SD) and TA low energy extension (TALE) fluorescence detector (FD)

  • Cosmic ray spectrum features the knee, the low energy ankle, the second knee, the ankle, and the cutoff have all been observed in the TA data

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Summary

Introduction

Energy spectrum is an important tool in cosmic ray physics. The Telescope Array (TA) is a modern cosmic ray detector, which is sensitive over a wide range of energies and which sees these features. We discuss the combined TA energy spectrum measurement, ranging from a couple of PeV to hundreds of EeV and higher, and focus on the recent developments of the TA surface detector (SD) spectrum analysis at the highest energies: a declination dependence of the TA SD spectrum above 1019 eV, a discrepancy in the spectrum measurement between the TA and Auger experiments above 1019 eV, and an important check of the TA SD spectrum calculation using the Constant Intensity Cut [1] analysis, which is an alternative model-independent reconstruction technique for TA. Current details of the TALE spectrum measurement and interpretation can be found in [2],[3], and [4]

TA Data
Combined TA Spectrum
Declination Dependence of the TA SD Spectrum
Standard Reconstruction
Constant Intensity Cut Method
Spectrum Comparison
Summary
Full Text
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