Calculated solar-neutrino capture rate for a radiochemical 205 Tl-based solar-neutrino detector
Abstract
Radiochemical experiments for low-energy solar-neutrino detection have been making headlines by exploiting the isotopes Cl37 and Ga71. Such a very low-threshold measurement of this type can also be performed using Tl205, which has been considered for decades for this purpose. A unique feature of this detector nucleus is the integration is the solar-neutrino flux over millions of years owing to its long-living daughter Pb205. In this study we have calculated for the first time the cross section for the charged-current solar-neutrino scattering off Tl205. Taking into account the solar-model-predicted neutrino fluxes and the electron-neutrino survival probabilities, a solar-neutrino capture rate of 62.2 8.6 SNU is determined, a value significantly smaller than in previous estimates.
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