Result generation

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Result generation

It Result generation determine the so-far unknown third neutrino mixing angle which is a fundamental property with important consequences for particle and astro-particle physics.

The Double Chooz experiment is looking for neutrinos produced in the nearby nuclear power plant. A measurement of this third angle would complete our picture of neutrino oscillations as reported by other experiments and will open new perspectives in understanding why we find matter and no antimatter in our today's Universe.

Neutrinos are the most common particles existing in the Universe, but they are the least visible. They exist in three kinds called "flavors" and they have been known since the late 90's for their special ability to transform Result generation one type into another.

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This phenomenon is called neutrino oscillation and it implies that neutrinos do have a mass. Neutrino oscillations are currently an intensive field of research with several experiments aiming at a full description of the mechanism. Neutrinos are produced in various ways such as by fusion processes inside the Sun and by cosmic rays bombarding the atmosphere.

The Double Chooz experiment is dedicated to measure neutrino oscillations with unprecedented precision, by looking at anti-neutrinos being produced in the nearby nuclear reactor at Chooz in the French Ardennes.

Double Chooz started taking data six months ago. At the LowNu conference in Korea the collaboration just announced its first results, reporting new data consistent with short-range oscillations.

Generation Z - Wikipedia

This result is based on the observation of the "disappearance" of anti- neutrinos in the expected flux observed from the nuclear reactor. The three different flavours of neutrinos are related to their charged lepton counterparts: Oscillations depend on three mixing parameters, of which two are large and have been measured before.

The Double Chooz collaboration, by measuring the "disappearance" of electron antineutrinos, presents hints for oscillation also involving the third angle with the following value: The probability given by preliminary results that there is no oscillation is only 7.

Result generation

Furthermore, it relates indirectly to the origin of the asymmetry between matter and antimatter in the Universe. Measuring it precisely is the key to open the door to new physics beyond the standard model of particle physics and we are now very close to it" said Herve de Kerret from CNRS in France, and spokesman of the Double Chooz collaboration.

Generation - Wikipedia

In Junefirst hints of oscillation of neutrino muon neutrinos to neutrino electron neutrinos, involving this third angle, have been reported by accelerator experiments. The Double Chooz collaboration, by measuring the "disappearance" of electron antineutrinos, presents complementary and important evidence of oscillation also involving the third angle.

Double Chooz uses currently a detector located at a distance of about m from the reactor cores. The precision of the measurement will further increase over time and after the start of operation inof a second or "near" detector located at a distance of m from the reactor.

At these distances, no significant transformation into another neutrino species is expected. The detector target is composed of 10m3 of liquid scintillator developed specifically for this experiment.

The scintillator is doped with gadolinium in order to tag neutrons from inverse beta decays induced by the reactor anti-neutrinos.

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The target is surrounded by layers of other liquids protecting against other particles and environmental radioactivity. The target is observed by immersed photomultipliers, converting the interactions into electronic signals.

Result generation

These signals are processed in a data acquisition system, which is ready to take data over the next five years.

The new detectors will ensure that neutrino physics will stay one of the most fruitful areas of particle physicsas it has been for the past 50 years.First result from a new generation of reactor neutrino experiments November 9, , CNRS/CEA Physicists of the Double Chooz experiment detected a short-range disappearance of .

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Generation - Wikipedia