The isotopes 124Xe and 134Xe are predicted by theory to undergo double beta decay, but this has never been observed so they are considered stable.
Isotoopide 124Xe ja 134Xe puhul oletatakse, et nad teevad läbi topelt-beetalagunemise, kuid seda pole kunagi suudetud tõestada ja nii loetakse ka neid stabiilseteks isotoopideks.