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SUMMARY:Current status of the Double Chooz experiment
DTSTART;VALUE=DATE-TIME:20140704T071500Z
DTEND;VALUE=DATE-TIME:20140704T072800Z
DTSTAMP;VALUE=DATE-TIME:20261007T042913Z
UID:indico-contribution-1566@indico.ific.uv.es
DESCRIPTION:Speakers: Julia Haser (Max-Planck-Institut fuer Kernphysik)\nT
 he Double Chooz reactor antineutrino experiment aims for a precision measu
 rement of the neutrino mixing angle $\\theta_{13}$. Located at the Chooz n
 uclear power plant in France\, it observes an energy dependent deficit in 
 the neutrino spectrum\, currently with one detector filled with gadolinium
 -loaded liquid scintillator at a baseline of 1.05\\\,km. The past Double C
 hooz publications featured different analysis approaches: The $\\theta_{13
 }$ result was not only provided via rate-only analysis of the deficit in n
 eutrino flux\; a combined rate and spectral shape fit as well as a backgro
 und model independent analysis based on reactor power variations were perf
 ormed\, giving consistent results. Besides that\, Double Chooz has been th
 e first experiment to determine $\\theta_{13}$ using the neutrino detectio
 n channel via neutron captures on hydrogen nuclei. Among the recent reacto
 r-based oscillation experiments with comparable baseline it was the only o
 ne to observe scheduled reactor shutdown phases. These enabled to measure 
 the background spectrum solely\, allowing to crosscheck the background mod
 els used in the oscillation analysis.\nAt present an improved analysis is 
 in progress with twice as much data statistics collected compared to the l
 ast publication. Revised selection criteria and background studies enhance
  the signal to background ratio while a reduction in the corresponding unc
 ertainties is achieved. Along with an improved energy calibration the over
 all systematic uncertainty on $\\theta_{13}$ is decreased preparing for a 
 two detector analysis.\nIn the near future the second identically construc
 ted detector will commence operation at 400 meters distance to the reactor
  cores\, leading to a cancellation of correlated systematic uncertainties\
 , which allows for a high precision $\\theta_{13}$ measurement.\n\nhttps:/
 /indico.ific.uv.es/event/2025/contributions/1566/
LOCATION: Auditorium 3B
URL:https://indico.ific.uv.es/event/2025/contributions/1566/
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