14–24 Jul 2025
CICG - International Conference Centre - Geneva, Switzerland
Europe/Zurich timezone
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Hybrid Measurement of UHECR Mass Composition with TAx4

18 Jul 2025, 17:20
15m
CICG - International Conference Centre - Geneva, Switzerland

CICG - International Conference Centre - Geneva, Switzerland

17 rue de Varembé CH - 1211 Geneva Switzerland
Talk Cosmic-Ray Indirect CRI

Speaker

Zane Gerber (University of Utah)

Description

We present an analysis of ultra-high energy cosmic ray (UHECR) mass composition based on four years of data collected by Telescope Array’s expansion project, TA×4. Reconstructing events in hybrid mode, combining information from both the fluorescence detectors (FDs) and surface detectors (SDs), we measure the mass composition of UHECRs using the distribution of the depth of air shower maxima (Xmax). The hybrid technique enhances the precision of the reconstructed shower geometry, leading to more accurate Xmax measurements. Our results suggest a predominantly light composition, with protons and light nuclei comprising the majority of cosmic rays above 10^18.5 eV.

Collaboration(s) Telescope Array Project

Author

Zane Gerber (University of Utah)

Presentation materials

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