To detect the decay via electron capture of 71Ge, which is produced by the interaction of solar neutrinos on 71Ga, a cryogenic detector, exhibiting both good energy resolution and high detection efficiency (4pi) was developed. The overall efficiency of Gallium based radiochemical solar neutrino experiments can be increased drastically, if this type of detector is introduced in such an experiment. The low-temperature detectors in question are based on superconducting phase transition thermometers (TESs). A specially developed glueing technique allows thermal deposition of 71Ge onto the low-temperature detector, which is completely decoupled from the production process of the TES. Furthermore the TESs can be connected via the glueing technique to various absorber materials. Longterm measurements with reactor-activated 71Ge were successfully performed in an especially set up cryostat in the underground laboratory in Garching. In addition to that, Ir/Au-microcalorimeters using Sn-absorbers achieved a worldwide best energy resolution (for Ir/Au TESs)) of 5.9eV at 5.9keV.
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To detect the decay via electron capture of 71Ge, which is produced by the interaction of solar neutrinos on 71Ga, a cryogenic detector, exhibiting both good energy resolution and high detection efficiency (4pi) was developed. The overall efficiency of Gallium based radiochemical solar neutrino experiments can be increased drastically, if this type of detector is introduced in such an experiment. The low-temperature detectors in question are based on superconducting phase transition thermometers...
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