Isotopic compositions of the anomalous xenon components, such as the s
o-called xenon-H L and the s-type xenon, can be explained in terms of
a two-component model in which they are regarded as representing the i
sotopic composition of a mixture of the Pu-244 fission xenon component
and a trapped xenon component, whose isotopic composition resembles t
hat of the atmospheric xenon, but is often markedly altered by a combi
ned effect of a) mass-fractionation, b) spallation and c) neutron-capt
ure reactions caused primarily by the 10 keV (stellar temperature) neu
trons.