Liquid Scintillator Neutrino Detector
particle measurement device
The Liquid Scintillator Neutrino Detector (LSND) was a physics experiment at Los Alamos National Laboratory designed to detect neutrinos. The LSND project was created to look for evidence of neutrino oscillation and ran from 1993 to 1998. Its results indicate the existence of sterile neutrinos, which conflicts with other solar and atmospheric neutrino oscillation experiments and the Standard Model expectation of only three neutrino flavors.
Experiment
Neutrinos for the LSND were produced at LANSCE (Los Alamos Neutron Science Center). A proton beam was collided with a water target, producing pions. These pions decayed to muons, which in turn decayed to mu neutrinos. The detector, located 30 meters (98 ft) away, consisted of a tank filled with 167 tons (50,000 gallons) of mineral oil and 14 pounds (6.4 kg) of b-PDB organic scintillator material. A neutrino event in the scintillator would produce Cherenkov radiation and scintillation light, which were detected by an array of 1220 photomultiplier tubes.
Results
Most of the neutrinos detected at LSND were identified as mu neutrinos, but a small part (1 in 104) were electron neutrinos. As no electron neutrinos were produced at the source, this was interpreted as evidence of neutrino oscillations.
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This entry incorporates text from “Liquid Scintillator Neutrino Detector” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.