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GALLEXGallium Experiment
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The GALLEX solar neutrino measurements, along with those from the Soviet-American Gallium Experiment (SAGE) in Russia and the Kamiokande detector in Japan, spotlight one particular step in the chain of nuclear fusion reactions occurring in the sun's core.
"Since we have just shown that we can detect essentially all the neutrinos from chromium-51 in the GALLEX detector, we should also be able to detect the solar beryllium-7 neutrinos.
In this global analysis the following experimental information is included: the atmospheric neutrino data (Super-Kamiokande [93] phases 1-4), the long baseline accelerator experiments (K2K [42], disappearance and appearance data of MINOS [94], and T2K [90]), the reactor experiments (CHOOZ [95], Palo Verde [96], Double-Chooz [97], Daya Bay [98], RENO [53], and KamLAND [99]), solar radiochemical experiments (Homestake [24], GALLEX [34], and SAGE [27, 28]), and solar real-time experiments (Super-Kamiokande [100], SNO [38], and Borexino [84, 85]).
A deficit has been also evidenced in the GALLEX [34] and SAGE [35] calibrations campaigns with a [sup.51]Cr source (SAGE also with a [sup.37]Ar source [36]).
Kirsten, "Reanalysis of the GALLEX solar neutrino flux and source experiments," Physics Letters B, vol.
At the Gran Sasso underground laboratory in Italy, GALLEX researchers measured the rate at which nuclei of gallium-71 capture solar neutrinos to produce radioactive germanium-71.
The GALLEX collaboration has submitted two papers for publication in PHYSICS LETTERS B.
Although the GALLEX results show a neutrino shortfall, this deficit is less than that observed in the other neutrino experiments.
However, the GALLEX result is somewhat higher than expected by theorists who favor this scenario.