Reconstruction of Characteristics of Extensive Air Showers Detected with the NEVOD-EAS Array
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ELEMENTARY PARTICLES AND FIELDS Experiment
Reconstruction of Characteristics of Extensive Air Showers Detected with the NEVOD-EAS Array O. I. Likiy1), 2)* , M. B. Amelchakov1), A. G. Bogdanov1) , A. Chiavassa1), 3), 4) , S. S. Khokhlov1), R. P. Kokoulin1), and I. A. Shulzhenko1) Received July 11, 2019; revised July 11, 2019; accepted July 11, 2019
Abstract—In 2018, the creation of the central part of the NEVOD-EAS cluster-type array aimed at detection of the electron–photon component of extensive air showers in the energy range from 1015 to 1017 eV was completed. At present, a continuous data taking is being performed at the array. The results of the reconstruction of registered extensive air showers using the methods developed within the framework of the cluster approach to experimental data analysis are presented. DOI: 10.1134/S1063778819660372
1. INTRODUCTION The NEVOD-EAS array [1] is dedicated to the detection of the electron–photon component of extensive air showers in the energy range from 1015 to 1017 eV registered by the other detectors and facilities of the Experimental complex NEVOD (MEPhI, Moscow) [2–5]. The array is organized by a cluster principle. The detailed description of the array structure and cluster construction is presented in [6]. The clusters are deployed on the roofs of the University buildings and on the ground and operate as synchronized (with 10-ns accuracy) stand-alone EAS arrays independently sampling both the number and the transit time of EAS particles in each detecting element. The detecting element of the cluster is the scintillation detector station (DS) with a sensitive area of about 2.6 m2 and a dynamic range of up to 10000 particles/m2 . The construction and characteristics of the NEVOD-EAS detector stations are described in [7, 8]. In 2018, the central part of the NEVOD-EAS array including 9 clusters deployed over the area of 104 m2 around the Experimental complex NEVOD (Fig. 1) was completed and launched into continuous operation. Clusters Nos. 1–3 and 9 are located at the 1)
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia. 2) P. N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia. 3) Dipartimento di Fisica dell’ Universitа degli Studi di Torino, Torino, Italy. 4) Sezione di Torino dell’ Istituto Nazionale di Fisica Nucleare—INFN, Torino, Italy. * E-mail: [email protected]
roofs of the laboratory buildings of the Experimental complex NEVOD. Clusters Nos. 4–8 are on the ground surface. The data taking at the NEVOD-EAS is divided into 24-hour runs during which all array clusters detect extensive air showers independently of each other and periodically measure the most probable responses of their detector stations to the passage of single muons. At the end of each one-day run a set of calibration parameters is calculated for each array cluster. The events registered by separate clusters are combined in EAS events at the array which are then reconstructed using the methods developed within the frame
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