… inclusions in the Allende meteorite, most notably a single large coarse-grained "high
temperature … radionuclides in natural samples is limited to the most … of the match between
fission xenon spectra in meteorites and in artificially produced 244Pu (Alexander et a!. …

[en] In determining the initial abundance of 244 Pu in materials within the solar system, a
great difficulty is encountered in explaining the apparent existance in carbonaceous
chondrites of far greater amounts of a fission-like xenon component (the so-called Renazzo …

… The spontaneous fission of the extinct radionuclide 244 Pu appears to have contributed
to the inventories of the fissiogenic xenon in the … extinct radionuclide 129 I. The 244 Pu/
136 Xe and 129 I/ 129 Xe decay intervals of many meteorites were found to be concordant. (author) …

… fission in a laboratory sample of plutonium-244 is precisely what meteoriticists predicted it …
the sun, and that the early meteoritic abundances of plutonium-244, heretofore tentative, can be
… posed by these nuclides have received attention in the literature (13, 13a), but calculations …

Abstract It has long been generally accepted that 244Pu fission xenon is absent in lunar fines,
while carbonaceous chondrites contain the so-called xenon-HL, which is a strange fission-like
xenon component, whose isotopic composition is different from that of the 244Pu fission /…

… The initial abundances of the two important extinct nuclides plutonium-244 and iodine-129
at the time of cessation of nucleosynthesis can be … meteoritic xenon will not seriously affect
our calculation. If the fission component is from one single source, namely plutonium-244, then …

… ruptly shifted back to the study of meteorites. The studies on the extinct radionuclides 129I
and 244Pu in meteorites seemed to have made … The most readily and widely studied of the
extinct radionuclides in meteorites is 129I, and there is an extensive data base for meteorite …

… -decay of extinct radionuclide 129I and the spontaneous fission of extinct radionuclide 244Pu.
… despite the availability of data from more than 75 meteorites, the question of whether the I-Xe
… of the meteorites from the values of (244Pu/238U)0 shown in Table 5, a meteorite whose …

… probable role of Pu •' in contributing meteoritic anomalies in the heavy isotopes of xenon.
Kuroda [1960] attributed to Pu •' decay the excess abundances (relative to meteoritic values)
of the heavy isotopes of xenon in the atmosphere. Cameron [1962] adopted the same point of …

… 244 meteorite parent body since the Pu content at the end of nucleosynthesis can be estimated
from nuclear systematics provided the … Such an event would produce extinct and stable
nuclides in comparable amounts and the initial abundances of extinct nuclides can, therefore, …