# Present status and prospects of the Tunka Radio Extension

## TL;DR

Tunka-Rex is a radio array detecting air-shower emissions from cosmic rays above 100 PeV, with recent upgrades improving data collection and analysis for cosmic ray energy and composition studies.

## Contribution

The paper reports on the latest results and upgrades of Tunka-Rex, enhancing its capabilities for cosmic ray measurement and analysis.

## Key findings

- Updated analysis of the mean shower maximum as a function of energy.
- Efficiency study of the Tunka-Rex detector array.
- Plans for combined measurements with Tunka-Grande for mass composition.

## Abstract

The Tunka Radio Extension (Tunka-Rex) is a digital radio array operating in the frequency band of 30-80 MHz and detecting radio emission from air-showers produced by cosmic rays with energies above 100 PeV. The experiment is installed at the site of the TAIGA (Tunka Advanced Instrument for cosmic rays and Gamma Astronomy) observatory and performs joint measurements with the co-located particle and air-Cherenkov detectors in passive mode receiving a trigger from the latter. Tunka-Rex collects data since 2012, and during the last five years went through several upgrades. As a result the density of the antenna field was increased by three times since its commission. In this contribution we present the latest results of Tunka-Rex experiment, particularly an updated analysis and efficiency study, which have been applied to the measurement of the mean shower maximum as a function of energy for cosmic rays of energies up to EeV. The future plans are also discussed: investigations towards an energy spectrum of cosmic rays with Tunka-Rex and their mass composition using a combination of Tunka-Rex data with muon measurements by the particle detector Tunka-Grande.