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SUMMARY:The first observation of effect of oscillation in Neutrino-4 exper
 iment on search for sterile neutrino
DTSTART;VALUE=DATE-TIME:20181023T134500Z
DTEND;VALUE=DATE-TIME:20181023T141000Z
DTSTAMP;VALUE=DATE-TIME:20260422T082330Z
UID:indico-contribution-1363@cern.ch
DESCRIPTION:Speakers: Anatolii Serebrov ()\nWe report Neutrino-4 experimen
 t results of measurements of reactor antineutrinos flux and spectrum depen
 dence on the distance in range 6-12 meters from the center of the reactor 
 core. The fit of experimental dependence with the law $1⁄L^2$\, where L 
 is the distance from the reactor center\, gave satisfactory result with go
 odness of fit 81%. However\, we discovered that the experimental neutrino 
 spectrum is different from the calculated one. Using experimental spectrum
  we performed the model independent analysis of restrictions on oscillatio
 n parameters $\\Delta m_{14}^2$ and $sin^2 2\\Theta_{14}$. The results of 
 this analysis exclude area of reactor and gallium anomaly at C.L more than
  99.7%\n($>3\\sigma$) for values $\\Delta m_{14}^2 \\le 4~eV^2$ and $sin^2
  2\\Theta_{14} > 0.1$. However\, we observed an oscillation effect at C.L.
  99.7% ($3\\sigma$) in vicinity of $\\Delta m_{14}^2 \\approx 7~eV^2$ and 
 $sin^2 2\\Theta_{14} \\approx 0.35$. The method of coherent addition of re
 sults of measurements\, which allows us to directly observe the effect of 
 oscillations\, is proposed. The analysis of that effect is presented. In g
 eneral\, it seems that the effect predicted in gallium and reactor experim
 ents is confirmed but at sufficiently large value of $\\Delta m_{14}^2$. F
 uture prospects of the experiment are discussed.\n\nhttps://indico.particl
 e.mephi.ru/event/22/contributions/1363/
LOCATION:Hotel Intourist Kolomenskoye 4* Petrovskiy hall
URL:https://indico.particle.mephi.ru/event/22/contributions/1363/
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