An Interpretation of General Anomalies of Xenon and the Isotopic Composition of Primitive Xenon

A linear correlation in a three-isotopes plot between 130Xe/ 136Xe and mXe/136Xe(m=128, 131, 132 and 134)on the published data, which include the carbonaceous chondrites and the lunar soils, is found. The atmospheric xenon does not fit the correlation. The constancy of the ratio 128Xe/130Xe with the extending ratios 128Xe/136Xe and 130Xe/136Xe for the samples studied excludes a mass fractionation in xenon from the relevant samples. In order to understand the correlation and the deviation of the atmospheric xenon from the correlation, there is proposed a hypothesis that both the meteorite trapped xenon and the solar xenon have been differentiated from a single component of primitive xenon in common in the early solar system by the implication of fission xenon in it, while the terrestrial xenon differentiated from the same primitive xenon by the implication of fission xenon followed by a gross mass fractionation which proceeded as exp[-at √ m].On the hypothesis, the isotopic composition of primitive xenon is tentatively estimated to be: 124/126/128 130/131/132/134/136=(0.018)/(0.016)/0.31(+0.03 ∼-0.01)/0.61(+0.03 ∼-0.01)/2.99(+0.14 ∼-0.07)/3.63(+0.15 ∼-0.08)/1.29(+0.02 ∼-0.01)/=1.00. The fission yields for the fission components implicated are estimated. A striking correlation between fissiogenic 136Xef and 132Xe is found on the basis of the isotopic composition of primitive xenon, which supports the suggestion by Anders and Heymann that a progenitor of fissiogenic xenon might be a superheavy element.