A Xe atom that does not capture a neutron undergoes beta decay to Cs, one of the 7 long-lived fission products, while a Xe that does capture a neutron becomes almost-stable Xe.
The probability of capturing a neutron before decay varies with the neutron flux, which itself depends on the kind of reactor, fuel enrichment and power level; and the Cs / Xe ratio switches its predominant branch very near usual reactor conditions.
Estimates of the proportion of Xe during steady-state reactor operation that captures a neutron include 90%, 39%–91% and "essentially all".
For instance, in a (somewhat high) neutron flux of 10 n·cm·s, the xenon cross section of σ =  cm ( barn) would lead to a capture probability of  s, which corresponds to a half-life of about one hour. Compared to the 9.17 hour half-life of Xe, this nearly ten-to-one ratio means that under such conditions, essentially all Xe would capture a neutron before decay. But if the neutron flux is lowered to one-tenth of this value, like in CANDU reactors, the ratio would be 50-50, and half the Xe would decay to Cs before neutron capture.
Xe from neutron capture ends up as part of the eventual stable fission xenon which also includes Xe, Xe, and Xe produced by fission and beta decay rather than neutron capture.
Nuclei of Xe, Xe, and Xe that have not captured a neutron all beta decay to isotopes of caesium. Fission produces Xe, Xe, and Xe in roughly equal amounts but, after neutron capture, fission caesium contains more stable Cs (which however can become Cs on further neutron activation) and highly radioactive Cs than Cs.