# Latest results of the Tunka Radio Extension (ISVHECRI2016)

## TL;DR

Tunka-Rex, a sparse radio array at Siberia's TAIGA facility, measures cosmic ray air-showers with high precision, demonstrating its potential for mass composition studies despite a high energy threshold.

## Contribution

This paper presents the latest results and setup of Tunka-Rex, highlighting its capabilities in measuring air-shower parameters and its potential for cosmic ray composition analysis.

## Key findings

- Radio arrays can measure air-showers with better than 15% energy resolution.
- Depth of shower maximum can be determined with better than 40 g/cm^2 resolution.
- Tunka-Rex demonstrates promising prospects for mass-composition studies.

## Abstract

The Tunka Radio Extension (Tunka-Rex) is an antenna array consisting of 63 antennas at the location of the TAIGA facility (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy) in Eastern Siberia, nearby Lake Baikal. Tunka-Rex is triggered by the air-Cherenkov array Tunka-133 during clear and moonless winter nights and by the scintillator array Tunka-Grande during the remaining time. Tunka-Rex measures the radio emission from the same air-showers as Tunka-133 and Tunka-Grande, but with a higher threshold of about 100 PeV. During the first stages of its operation, Tunka-Rex has proven, that sparse radio arrays can measure air-showers with an energy resolution of better than 15\% and the depth of the shower maximum with a resolution of better than 40 g/cm\textsuperscript{2}. To improve and interpret our measurements as well as to study systematic uncertainties due to interaction models, we perform radio simulations with CORSIKA and CoREAS. In this overview we present the setup of Tunka-Rex, discuss the achieved results and the prospects of mass-composition studies with radio arrays.