Feasibility of a 81Br(v,e –)81Kr Solar Neutrino Experiment

A solar neutrino experiment utilizing the interaction of ⁸¹Br(v,e ^–)⁸¹Kr to study the ⁷Be neutrino source in the interior of the sun is shown to be feasible. Resonance ionization spectroscopy was used to count less than 1000 atoms of 2 × 10⁵-yr ⁸¹Kr, making the bromine experiment possible. Except for the method of counting product atoms, the bromine experiment would be very similar to the successful chlorine detector ³⁷Cl(v,e ^–)³⁷Ar, and thus it is a natural sequel to the only solar neutrino experiment to date.