Raw event data of the ADRON-55 high-altitude ionization calorimeter, 2021 and 2023 observing seasons

The raw event records of the ADRON-55 ionization calorimeter, the central detector of the HADRON-55 complex at the Tien Shan high-mountain cosmic-ray station (Zhusaly-Kezen pass, 3340 m a.s.l., 43.04° N, 76.94° E, Kazakhstan), for the 2021 and 2023 observing seasons. The calorimeter is a two-tier, 55 m² coordinate detector with about 1220 g/cm² of absorber. Eight active planes of rectangular argon ionization chambers are arranged crosswise: odd planes measure the X coordinate, even planes measure Y. An upper gamma block of two planes registers the electromagnetic component of a shower core; a 220 mm lead target and a 2.2 m decay gap separate it from the iron-interleaved hadron block below. The channel pitch is 120 mm.