Volume 501 - 39th International Cosmic Ray Conference (ICRC2025) - Gamma-Ray Astrophysics
Optimization of gamma-ray energy estimation for the ALPAQUITA experiment
T. Kawashima*  on behalf of the ALPACA collaboration
*: corresponding author
Full text: pdf
Pre-published on: September 30, 2025
Published on: —
Abstract
The ALPACA experiment, a new air-shower array in Bolivia to observe cosmic rays and gamma rays in the energy range between TeV to PeV, aims to survey PeVatron candidates in the southern sky, including the Galactic Center.
The ALPAQUITA experiment, a prototype of ALPACA, has 97 scintillation detectors with an area of 1 m$^2$ and began data acquisition in April 2023.
In the ALPACA collaboration, the lateral distribution of air showers will be used for the energy reconstruction of gamma rays.
The lateral distribution is fitted using the Nishimura-Kamata-Greisen function, and the obtained function is used to determine the particle number density S$x$ at a distance x from the shower core.
Then, energy is parameterized as a function of S$x$ and the zenith angle, which enables us to determine gamma-ray energies.
We conducted Monte Carlo simulations to evaluate the performance of our energy estimation method in terms of bias and resolution in energy estimation.
DOI: https://doi.org/10.22323/1.501.0709
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