The ALPACA experiment: The project of the first sub-PeV gamma-ray observation in the southern sky

SciPost Physics Proceedings Pub Date : 2023-09-28 DOI:10.21468/scipostphysproc.13.008

Teruyoshi Kawashima

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Abstract

The ALPACA experiment is a project aiming to observe sub-PeV gamma rays for the first time in the southern hemisphere. The main goal of ALPACA is to identify PeVatrons, the accelerators of Galactic PeV cosmic rays, by observing sub-PeV pion-decay gamma rays generated in interactions between PeV cosmic rays and the interstellar medium. This new air shower experiment is located at an altitude of 4,740 m above sea level in the middle of Mt. Chacaltaya in Bolivia. The air shower array consists of 401 scintillation counters covering an 83,000 m ^2 2 surface area. In addition, a water-Cherenkov-type muon detector array with an area of 3,700 m ^2 2 is installed to discriminate gamma rays from background cosmic rays. The prototype array ALPAQUITA will start data taking in 2022 and will extend to ALPACA in 2024. We report on a general introduction to ALPACA, the progress of the project, and the sensitivity to sub-PeV gamma rays.

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ALPACA实验:首次在南方天空观测亚pev伽玛射线的项目

ALPACA实验是一个旨在首次在南半球观测亚pev伽马射线的项目。ALPACA的主要目标是通过观测PeV宇宙射线与星际介质相互作用产生的亚PeV介子衰变伽马射线，来识别pevatron，即星系PeV宇宙射线的加速器。这个新的风淋室实验位于玻利维亚Chacaltaya山中部海拔4740米的地方。空气淋室阵列由401个闪烁计数器组成，覆盖83,000 m ^ 22的表面积。此外，还安装了一个面积为3700 m ^ 22的水-切伦科夫型μ子探测器阵列，用于区分伽马射线和背景宇宙射线。原型阵列ALPAQUITA将于2022年开始数据采集，并将于2024年扩展到ALPACA。我们报告了ALPACA的一般介绍，项目的进展，以及对亚pev伽马射线的灵敏度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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SciPost Physics Proceedings

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