How will Double Chooz Measure θ13?
- Double Chooz uses two detectors of electron anti-neutrinos located at different distances away from a pair of nuclear reactors that serve as anti-neutrino sources.
- Both near and far detector will measure the number and energy of neutrinos coming from the nuclear reactor cores.
- Near detector is close enough (400 m) to the nuclear reactors core that all neutrinos arrive in there original flavor (electron anti-neutrino).
- Far detector is 1.1 km away from the nuclear reactors and depending on the size of θ13 part of neutrinos will change their type into muon or tau anti-neutrino and will therefore not be detected. (Detectors can only detect electron anti-neutrinos.)
- Difference between the number of neutrinos detected by the near and the far detector will be equal to the fraction of electron anti-neutrinos that changed their flavor into muon or tau anti-neutrino before reaching the far detector.
- Conversion electron anti-neutrino rate into a different neutrino flavor directly depends upon the size of θ13.
- The utilization of two identical detectors will ensure an accurate measurement of θ13.