Abstract
Despite large progresses in building new detectors and in the analysis techniques, the key questions concerning the origin, acceleration and propagation of Galactic Cosmic Rays are still open. A number of new EAS arrays is in progress. The most ambitious and sensitive project between them is LHAASO, a new generation multi-component experiment to be installed at very high altitude in China (Daocheng, Sichuan province, 4400 m a.s.l.). The experiment will face the open problems through a combined study of photon- and charged particle-induced extensive air showers in the wide energy range 10$^{11}$ - 10$^{18}$ eV. In this paper the status of the experiment will be summarized, the science program presented and the outlook discussed in comparison with leading new projects.
Highlights
IntroductionCosmic Rays (hereafter CR) are the messengers of the “non-thermal Universe”, generated in environments able to transfer energy and accelerate nuclei (and electrons) up to values not yet reached in our laboratories
Cosmic Rays are the messengers of the “non-thermal Universe”, generated in environments able to transfer energy and accelerate nuclei up to values not yet reached in our laboratories
The CR energy spectrum can be described by a power law with some features, the most important being the “knee” around 3×1015 eV and the “ankle” at about 1019 eV
Summary
Cosmic Rays (hereafter CR) are the messengers of the “non-thermal Universe”, generated in environments able to transfer energy and accelerate nuclei (and electrons) up to values not yet reached in our laboratories. Understanding their origin and propagation through the Interstellar Medium (ISM) is a fundamental problem which has a major impact on models of the structure and nature of the Universe. The integrated study of charged CRs and of gamma rays and neutrinos, which should trace high energy hadronic interactions mainly nearby the still unidentified acceleration sites, is one of the most important (and exciting) fields in the so-called “multi-messenger astronomy”. We will focus on Extensive Air Shower (EAS)-arrays, not discussing new imaging Cerenkov projects like Cerenkov Telescope Array, described, as an example, in [2]
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