Engineering topics

Sabu, D. D.

Publications and source records attributed to Sabu, D. D..

5 records

NASA NTRS1977

A theoretical investigation of isotopic anomalies of xenon in terrestrial and extra-terrestrial samples

The abundance and isotopic composition of noble gases in meteorites is discussed in relation to the composition of the early solar system. Carbonaceous chondrites contain a unique Xenon-X, which is rich in heavy and light isotopes. Variations in the occurrence of type-X and type-Y (the normal component) noble gases are of such magnitude that neither the injection of material from a nearby supernova nor presence of presolar grains can account for the anomalies in meteorites. Therefore, it is suggested that the entire solar system may have condensed from the debris of a single local supernova.

Sabu, D. D.↗

NASA NTRS1974

Trapped xenon in meteorites

Xenon in meteorites can be resolved into a mixture of component X and trapped xenon with the following composition, Xe-124 : Xe-126 : Xe-128 : Xe-130 : Xe-131 : Xe-132 : Xe-134 : Xe-136 = 0.0276 : 0.0248 : 0.501 : 1.00 : 5.04 : 6.19 : 2.31 : 1.90. This trapped meteoritic xenon is distinct from xenon trapped in the average carbonaceous chondrite which is shown to represent the average composition of the total xenon in meteorites containing various mixtures of component X and trapped meteoritic xenon.

Sabu, D. D.↗

NASA NTRS1974

Theoretical investigation of isotopic anomaly of xenon in carbonaceous chondrites and other terrestrial and extra-terrestrial samples

The composition of Xe released from carbonaceous chondrites between 600 and 1000 C, particularly its isotopic trapped forms, is analyzed. Data show trapped Xe to have the following forms: Xe-124, 126, 130, 131, 132, 134, and 136. Attempts were also made to explain the Xe anomaly by mass fractionation as well as determine the relationship between metoritic trapped Xe and solar Xe.

Sabu, D. D.↗

NASA NTRS1973

Solar wind xenon in some carbonaceous chondrites.

A table shows the isotopic composition of xenon from several carbonaceous chondrites in which the presence of solar xenon can be demonstrated. The data suggest the presence of a solar xenon component in these carbonaceous chondrites, but solar xenon in these meteorites can be more clearly demonstrated through correlation plots. It is argued that the incorporation of the solar type of noble gases must have occurred during the early history of meteoritic matter when this material consisted of fine-grained particles.

Sabu, D. D.↗

NASA NTRS1972

Xenon in carbonaceous chondrites.

A table showing the relative amounts of xenon isotopes in carbonaceous chondrites is presented. It is found that the enrichment of heavy xenon isotopes released from carbonaceous chondrites in the approximate temperature range from 600 to 1000 C is accompanied by an enrichment of the light xenon isotopes. The high degree of correlation between these two isotopic anomalies suggests that both result from a common source. There is no known nuclear or physical process which could produce both anomalies in situ. It is, therefore, suggested that the anomalies are the result of the release of isotopically anomalous xenon which was trapped in the meteorites.

Manuel, O. K.↗