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Various large-scale experiments for double beta decay or dark matter arebased on xenon. Current experiments are on the tonne scale but there are alsoideas to aim for even larger sizes in the future. Here we study the potentialof the isotope $^{131}$Xe to allow to make real-time measurements of solar $pp$neutrinos, besides classical neutrino-electron scattering. Improved nuclearmodels are used to determine the cross-section of neutrinos on $^{131}$Xe. Thepresent calculations deviate significantly from the previous ones due toupdated estimates for the excited-state contributions. The updated capture-rateestimate for $pp$ neutrinos is $(4.47\pm 0.09)\ \rm SNU$ and for all solarneutrinos $(80\pm 21)\ \rm SNU$, with neutrino survival probabilities takeninto account. Depending on the amount of Xe, solar $pp$ neutrinos might bemeasured with rates of 100 per day, thus allowing to monitor them in real timefor a long period.

Real-time measurements of solar $pp$ neutrinos using $^{131}$Xe