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SUMMARY:Study of Reactor Antineutrino Spectral Characteristics and Fuel Ev
 olution of a VVER-1000 Reactor with the iDREAM Detector at the Kalinin Nuc
 lear Power Plant
DTSTART;VALUE=DATE-TIME:20261028T133500Z
DTEND;VALUE=DATE-TIME:20261028T135000Z
DTSTAMP;VALUE=DATE-TIME:20261029T165439Z
UID:indico-contribution-6237@cern.ch
DESCRIPTION:Speakers: Ivan Zhutikov (MEPhI/NRC KI)\nWe present measurement
 s of the integral and spectral characteristics of the reactor electron ant
 ineutrino ($\\bar{\\nu}_e$) flux obtained with the iDREAM detector at Unit
  3 of the Kalinin Nuclear Power Plant\, which operates a VVER-1000 reactor
 . The measured positron spectrum from $\\bar{\\nu}_e$ interactions with pr
 otons in the iDREAM liquid scintillator is compared with a prediction base
 d on the isotope-dependent $\\bar{\\nu}_e$ spectra of the KI model\, a spa
 tial model of the VVER-1000 reactor core\, and a Monte Carlo simulation of
  the detector response. In the energy range of approximately $4$--$6~\\mat
 hrm{MeV}$\, a local excess of the measured spectrum over the prediction is
  observed\, confirming the presence of the reactor $\\bar{\\nu}_e$ spectra
 l anomaly. The iDREAM data also confirm a decrease in the inverse beta-dec
 ay interaction rate normalized to the reactor thermal power as $^{235}\\ma
 thrm{U}$ is depleted and $^{239}\\mathrm{Pu}$ accumulates in the reactor c
 ore during fuel burnup. Using the measured $\\bar{\\nu}_e$ interaction rat
 e\, the evolution of the $^{235}\\mathrm{U}$ and $^{239}\\mathrm{Pu}$ fiss
 ion fractions is reconstructed while the contributions from $^{238}\\mathr
 m{U}$ and $^{241}\\mathrm{Pu}$ are kept fixed. These results are further u
 sed to obtain a model-dependent estimate of the relative change in the $^{
 239}\\mathrm{Pu}$ mass in the reactor core over the course of the fuel cyc
 le.\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6237/
LOCATION: Conference Hall 4
URL:https://indico.particle.mephi.ru/event/626/contributions/6237/
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