Named for a gold ►mine in Lead, South Dakota, FTP, name this experiment carried out over a couple decades by Ray Davis Jr. to detect and count solar neutrinos.
This experiment relied on the fact that argon could be readily removed through a helium purge from a 100,000 gallon tank of per-chloro-ethylene; the argon was then loaded onto a small counter with tritium-free methane which served as a counting gas. It utilized a method previously outlined by Bruno Pontecorvo and independently three years later by Luis Alvarez. Pontecorvo also suggested a solution to the problem created by this experiment, which became evident when the calculations of John Bahcall proved to be three times larger than the results observed Â– that was explained by a failure to account for flavor oscillations in the design of the detector. Named for a gold ►mine in Lead, South Dakota, FTP, name this experiment carried out over a couple decades by Ray Davis Jr. to detect and count solar neutrinos. 
This experiment relied on the fact that argon could be readily removed through a helium purge from a 100,000 gallon tank of per-chloro-ethylene; the argon was then loaded onto a small counter with tritium-free methane which served as a counting gas.
Homestake experiment (accept Davis experiment until mention of Ray Davis)