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SUMMARY:Electron-Neutron Detector Array (ENDA)
DTSTART;VALUE=DATE-TIME:20210608T101000Z
DTEND;VALUE=DATE-TIME:20210608T102500Z
DTSTAMP;VALUE=DATE-TIME:20260906T172537Z
UID:indico-contribution-163@indico.nevod.mephi.ru
DESCRIPTION:Speakers: Xin-hua Ma (IHEP-CAS)\nBy accurate measurement of co
 mponents and energy spectrum in the knee region\, problem of origin of cos
 mic ray can be solved. In one extensive air shower (EAS)\, high energy had
 rons\, which constitute the EAS skeleton as G.T. Zatsepin called it\, carr
 y important information for multi-parameter correlation studies. The nucle
 ar reaction between hadrons and matter in the surrounding environment (suc
 h as soil\, buildings\, detector materials\, and air) produces a large num
 ber of evaporation neutrons\; moderating by matter in the surrounding envi
 ronment\, the evaporation neutrons become thermal neutrons. At the beginni
 ng of the 21th century\, a new technology\, electron-neutron detector (EN-
 detector) was designed by Y. Stenkin and his colleagues\, and the PRImary 
 Spectrum Measurement Array (PRISMA) project was proposed to reinforce arra
 y capability of cosmic ray composition separation and then improve measure
 ment accuracy of cosmic ray components and energy spectrum. Besides\, EN-d
 etectors can be used for continuous environmental thermal neutron flux mon
 itoring and its variation study needed not only for EAS experiment backgro
 und estimation but also for geophysical applications (e.g. earthquakes\, t
 hunderstorms\, radioactive aerosol control\, etc) and solar activity study
  (e.g. solar flares\, Forbush effects\, etc).\nUnder the Chinese-Russian c
 ooperation\, we put forward to build so called EN-Detector Array (ENDA) at
  high altitude in China. In 2013\, we placed a small array of 4 EN-detecto
 rs\, so called PRISMA-YBJ in the ARGO-YBJ experimental hall at Yangbajing 
 (YBJ) (4300m a.s.l.)\, Tibet\, China\, with which we achieved the simultan
 eous detection of thermal neutrons and electromagnetic components in EAS c
 oincident events between PRISMA-YBJ and ARGO-YBJ. Up to now\, one cluster 
 composed of 16 EN-detectors based on new type boron compound scintillator 
 is running in Moscow. Meanwhile\, there are four clusters running in China
  for detectors and arrays specification test: one so called P-16-YBJ at YB
 J\, one so called ENDA-16-HZS at LHAASO (4410m a.s.l.)\, Daocheng\, Sichua
 n\, and two at Hebei Normal University (HNU) near sea level\, Shijiazhuang
 \, Hebei. ENDA-16-HZS has obtained coincident events with LHAASO. In the n
 ear future\, we plan to extend ENDA to ENDA-64 with array area of 1000 m2 
 inside LHAASO to study the knee region of the light components (H and He).
  After it\, ENDA will be extended up to 400 detectors with array area of 1
 0000 m2 to study the knee region of the heavy components like Fe.\n\nhttps
 ://indico.nevod.mephi.ru/event/6/contributions/163/
LOCATION:Online Zoom
URL:https://indico.nevod.mephi.ru/event/6/contributions/163/
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