Under NEXT operating conditions, three-body recombination with xenon atoms is estimated to convert Ba2+ into Ba+ in about 0.25 to 2.5 milliseconds, so the barium charge state should not be assumed fixed.
Gando, et al., Phys
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Charge-state dynamics of barium ions in high-pressure xenon and its implications for Barium-Tagging in $0\nu\beta\beta$ searches
Under NEXT operating conditions, three-body recombination with xenon atoms is estimated to convert Ba2+ into Ba+ in about 0.25 to 2.5 milliseconds, so the barium charge state should not be assumed fixed.