Curium-248 in the Early Solar System

  title={Curium-248 in the Early Solar System},
  author={M. N. Rao and Kunchithapadam Gopalan},
PRIMITIVE meteorites such as carbonaceous chondrites (CC) and unequilibrated ordinary chondrites (UOC) have an anomalous fission xenon component1–3 which has a distinctly different fission spectrum from that of Ca-rich achondrites4,5. Although the latter is established as due to 244Pu spontaneous fission4, the origin of the former component is still debated. Further, the amount of fission xenon present in CC II–IV and some UOC is about two orders of magnitude6,7 higher than that of Ca-rich… 
17 Citations

On possible short-lived progenitors of fission xenon in carbonaceous chondrites

We suggest that the unidentified fission xenon component in carbonaceous chondrites may be attributable to the decay of the extinct radioactivities250Cm and, to a lesser extent,258Cm. Two assumptions

Extinct Superheavy Element in the Allende Meteorite

An effort has been made to identify the extinct superheavy element that was present in meteorites and decayed to 131-136Xe by spontaneous fission. To characterize its chemical properties, we have

Search for 248Cm in the early Solar System

— Possible evidence for the presence of 248Cm in the early Solar System was reported from fission gas studies (Rao and Gopalan, 1973) and recently from studies of very high nuclear track densities (≥

Host phases and origin of noble gases in meteorites

A large fraction of the noble gases in carbonaceous chondrites are concentrated in a small amount of meteoritic matter (≲ 2%). It consists of carbon (in different forms) and chromite which are the

Isotopic anomalies in meteorites

The classical picture of the pre-solar nebula is that of a hot, well-mixed cloud of chemically and isotopically uniform composition. Recent measurements have shown this conception to be erroneous,



Correlation between fission tracks and fission type xenon in meteoritic Whitlockite

Whitlockite from the St. Severin chondrite, previously shown to contain excess fission tracks, is here shown to have a large concentration of excess neutron-rich xenon isotopes. The concentration of

Iodine-129/Xenon-129 Age of Magnetite from the Orgueil Meteorite

If Karoonda and Orgueil magnetite formed from similar material, then the age difference is an upper limit to the formation time of these meteorites—and by customary extension, the solar system.


A detailed analysis of the rare gas content of the chondrite Renazzo is presented. Fractions of different isotopic composition are separated by heating the sample to successively higher temperatures.

Plutonium-244: Confirmation as an Extinct Radioactivity

The mass spectrum of xenon from spontaneous fission in a laboratory sample of plutonium-244 is precisely what meteoriticists predicted it would be, and the search for an explanation for anomalous fission-like xenon in carbonaceous chondrites can now be narrowed.

Spallation and fissiogenic xenon and krypton from stepwise heating of the Pasamonte achondrite; The case for extinct plutonium 244 in meteorites; Relative ages of chondrites and achondrites

Following the discovery by Rowe and Kuroda that there are striking excesses of the xenon ratios 134/132 and 136/132 in the Pasamonte achondrite, we performed stepwise heating experiments with this

Elements 112 to 119: Were They Present in Meteorites?

Chondrites contain a small fission xenon component of unexplained origin that suggests that it was not derived from an actinide element, or from a transition metal between Z = 104 and 111, but from a more volatile progenitor.