History
In the Thirties, through the learn of beta decay, it was apparent that a third particle, one of about there are no mass & by owning neutral charge existed and was non found.

This was due to the continuous spread of kinetic energy and momentum values for electrons emitted in beta decay. the exclusively way this was conceivable was whenever there was a particle of neutral charge and almost there is there is no mass (or even even no mass) produced in the decompose.

Potential for experiment
Around beta decay a predicted particle, the electron antineutrino ($\backslash bar\_e$) - should interact with the proton to produce a neutron and positron - the antimatter counterpart of the electron.

A positron quickly finds an electron, and it annihilate both more - the run called annihilation. Them resultant gamma rays ($\backslash gamma$) are easy detectable.

The setup
In that experiment, it utilized the nuclear reactor as they were required to develop neutrino fluxes on the choose of $10^$ neutrinos by the 2nd by the $cm^2$, far higher than any come-at-able flux from either more radioactive sources.

A neutrinos would so interact (equally shown above) sustaining protons in a tank of a lake, creating neutrons and positrons. Apiece antielectron would produce the pair of gamma rays when it exterminated sustaining an electron.

the gamma rays were found by placing a scintillator material in the tank of water supply. A scintillator poop gives off flashes of weak within response to a gamma rays & the weak flashes come found by photomultiplier tubes.

Still, this experiment wasn't conclusive sufficiency, and then it come higher sustaining another layer of certainty.

It would detect a neutrons by placing cadmium chloride into the tank. Cadmium is a highly effectual neutron absorber (so finds apply within nuclear control rods) and gives off the gammthe ray once it absorbes a neutron.

A arrangement was such that a gamma ray from either a cadmium would be found Quintet microseconds after the gamma ray from either the antielectron, in case it were truly by a neutrino.

The results
It performed a experiment preliminarily at Hanford, but late moved a experiment to the Savannah River Plant near Augusta, Georgia where they got better shielding against cosmic rays. This shielded location was Xi m from either a reactor & Twelve m underground.

It utilized Two tanks using the number of astir 200 liters of a water supply by having astir Forty kilogram of dissolved CdCl₂. A cistern were sandwiched between ternary scintillator layers which contained 115-inch (127 millimeter) photomultiplier tubes.

When months of informatiin collection, it got accumulated information on astir triad neutrinos per hour in their detector. To become absolutely surely that it were seeing neutrino cases from the detection scheme described above, it close down the reactor to show that there was a difference in the total of found events.

It got predicted the cross-segment for the reaction to become astir 6×10⁻⁴⁴ cm² & their measured cross-part was Half a dozen.Three ×10⁻⁴⁴ cm². Their resolutions were published around 1956.

Frederick Reines was honored with a Nobel Prize in 1995 for his work in neutrino physics.