Year: 2025
Type: conference-paper
Abstract: The ALPACA experiment is currently under construction to achieve the first sub-PeV gamma-ray observations in the Southern Hemisphere. The observatory consists of a surface air shower array and underground muon detectors, following the successful design of the Tibet AS$\gamma$ experiment. As part of the initial phase, the ALPAQUITA array, comprising 97 surface detectors with 15$\,$m spacing, has been completed and has already begun early observations. In this study, we will report on the energy estimation methods for cosmic rays observed with the ALPAQUITA array. Several approaches have been widely used for air shower arrays, including the energy estimation based on the total particle density sum ($\Sigma\,\rho$), the shower size parameter $N_{e}$ obtained from lateral distribution functions, and lookup tables incorporating particle densities at specific distances from the shower axis and zenith angle dependence, as adopted by experiments such as Tibet AS$\gamma$ and Telescope Array. We examine the applicability of these methods to the ALPAQUITA array and discuss the resulting energy estimation performance.
DOI: 10.22323/1.501.0260
Author: Keitaro Fujita
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: Challenges in Space Weather Prediction Using the Sun's Shadow in the Cosmic Rays, Measurement of cosmic-ray proton energy spectrum to test the standard model of galactic cosmic-ray origin, Gamma Ray Astronomy at Highest Energy in the Southern Hemisphere, G373756783, Novel Development of Highest Energy Gamma Ray Astronomy, Unravelling mystery of cosmic particle accelerator PeVatron by highest-energy gamma-ray observation, Origin of galactic cosmic rays revealed by observations of ultra-high cosmic gamma rays in the southern hemisphere, Demonstration of 100 TeV gamma-ray observation in the southern hemisphere
OpenAlex ID: W4414420477
FWCI:
Cites:
Cited by:
Related to: