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SUMMARY:Recent results from Daya Bay reactor neutrino experiment and their
  implication on the Reactor Antineutrino Anomaly - Dr David Martinez (Illi
 nois Institute of Technology)
DTSTART:20171031T150000Z
DTEND:20171031T160000Z
UID:TALK77052@talks.cam.ac.uk
CONTACT:Lorena Escudero
DESCRIPTION:The reactor antineutrino anomaly (RAA) has been puzzling react
 or neutrino physics community since 2011. The RAA refers to the deficit of
  electron antineutrinos detected by reactor neutrino experiments compared 
 with the number of electron antineutrinos predicted by state of the art re
 actor models. The Daya Bay experiment has utilized eight functionally iden
 tical underground detectors to sample reactor antineutrino fluxes from thr
 ee pairs of nuclear reactors in South China\, accruing the largest reactor
  antineutrino sample to date. This talk will summarize Daya Bay’s most r
 ecent result\, which presents observations of correlations between reactor
  core fuel evolution and changes in the detected reactor antineutrino flux
  and energy spectrum. A 10σ variation in IBD yield was found to be energy
 -dependent\, rejecting the hypothesis of a constant antineutrino energy sp
 ectrum at 5.1 standard deviations. While measurements of the linear variat
 ion with respect to the fuel content in the IBD spectrum show general agre
 ement with predictions from recent reactor models\, the measured linear va
 riation with respect to the fuel content in the total IBD yield disagrees 
 with recent predictions. This discrepancy indicates that an overall defici
 t in measured flux with respect to predictions does not result from equal 
 fractional deficits from the primary fission isotopes 235U\, 239Pu\, 238U\
 , and 241Pu. A 7.8% discrepancy between the observed and predicted 235U yi
 eld suggests that this isotope may be the primary contributor to the react
 or\nantineutrino anomaly.
LOCATION:Ryle Seminar Room (Rutherford 930) 
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