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We investigate the prospects for real-time detection of solar neutrinos viathe charged-current neutrino-nucleus scattering process in liquid xenon timeprojection chambers. We use a nuclear shell model, benchmarked withexperimental data, to calculate the cross sections for populating specificexcited states of the caesium nuclei produced by neutrino capture on $^{131}$Xeand $^{136}$Xe. The shell model is further used to compute the decay schemes ofthe low-lying $1^{+}$ excited states of $^{136}$Cs, for which there is sparseexperimental data. We explore the possibility of tagging the characteristicde-excitation $\gamma$-rays/conversion electrons using two techniques: spatialseparation of their energy deposits using event topology and their timeseparation using delayed coincidence. The efficiencies in each case areevaluated within a range of realistic detector parameters. We find that thetopological signatures are likely to be dominated by radon backgrounds, butthat a delayed coincidence signature from long-lived states predicted in$^{136}$Cs may enable background-free detection of CNO neutrino interactions innext-generation experiments with smaller uncertainty than current measurements.We also estimate the sensitivity as a function of exposure for detecting thesolar-temperature-induced line shift in $^{7}$Be neutrino emission, which mayprovide a new test of solar models.

Solar neutrino detection in liquid xenon detectors via charged-current scattering to excited states