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SUMMARY:Analysis of energy deposit of EAS cores in the Cherenkov water cal
 orimeter NEVOD
DTSTART;VALUE=DATE-TIME:20261030T153000Z
DTEND;VALUE=DATE-TIME:20261030T154500Z
DTSTAMP;VALUE=DATE-TIME:20261104T180204Z
UID:indico-contribution-6220@cern.ch
DESCRIPTION:Speakers: Mikhail Lisitsyn (PhD student)\nA basis of the Exper
 imental Complex NEVOD (MEPhI\, Moscow) is the Cherenkov water calorimeter 
 (CWC) with a volume of 2000 m3. The quasi-spherical modules (QSMs) consist
 ing of 6 orthogonally oriented photomultiplier tubes (PMTs) are used to de
 tect Cherenkov radiation. The CWC NEVOD includes 91 QSMs (546 PMTs in tota
 l) which form a spatial grid in the water volume with 25 vertically arrang
 ed strings\, 3 – 4 QSMs in each. Such arrangement of photomultiplier tub
 es and their wide dynamic range from 1 to 105 photoelectrons\, achieved by
  a two-dynode signal readout\, allows CWC NEVOD to operate in the calorime
 ter mode.\n\nThe NEVOD-EAS array is a part of the Experimental Complex NEV
 OD. It consists of 36 scintillation detector stations (DS)\, combined into
  9 clusters\, which are placed over an area of about 104 m2 on the roofs o
 f laboratory buildings and on the ground surface. The array is designed to
  measure the electron-photon component of extensive air showers (EAS) with
 in an energy range from 1015 to 1017 eV. Using its data various EAS parame
 ters are reconstructed: the air-shower core position\, size and arrival di
 rection.\n\nThe central part of an extensive air shower near its axis is c
 alled the EAS core\, where hadrons being generated. In their decays\, the 
 hadrons form electron-photon and muon components of the EAS. Fluctuations 
 in the recorded shower characteristics\, containing information on primary
  nuclear interaction acts\, are minimal in the cores of extensive air show
 ers. But at the same time\, most of the conducted studies are focused on t
 he EAS electron-photon component\, which is the easiest one to detect.\n\n
 The combination of the EC NEVOD facilities provides an opportunity to sele
 ct and reconstruct extensive air showers by the electron-photon component 
 with NEVOD-EAS array and to study the energy deposit of EAS cores in the C
 herenkov water calorimeter.\n\nIn this work\, the study of joint events of
  the CWC NEVOD and the NEVOD-EAS array was carried out based on the experi
 mental data recorded in 2018 - 2023. For such events\, the selection condi
 tions and characteristics are presented\, the features of the reconstructe
 d EAS size spectrum\, as well as the spectra of energy deposit from all ev
 ents and events with cores passing through the CWC are discussed.\n\nhttps
 ://indico.particle.mephi.ru/event/626/contributions/6220/
LOCATION: Conference Hall 4
URL:https://indico.particle.mephi.ru/event/626/contributions/6220/
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