Features in the Cosmic Ray Energy Spectrum Observed with Telescope Array Surface Detectors

Understand

Ultra-high energy cosmic rays (UHECRs) are extremely energetic charged particles that originate from outer space.

• The Telescope Array (TA) experiment, the largest UHECR observatory in the Northern Hemisphere, has provided high-precision measurements of the cosmic ray energy spectrum due to its stable operation and efficient data collection.
• These measurements have revealed three significant spectral features: the ankle, shoulder, and cutoff.
• Analyzing these features is crucial for understanding the origin and propagation of UHECRs.