Correlation Between Fission Tracks and Fission-Type Xenon from an Extinct Radioactivity

Creators: Wasserburg, G. J.; Huneke, J. C.; Burnett, D. S.

Abstract

Meteoritic whitlockite containing excess fission tracks has a large concentration of excess neutron-rich xenon isotopes which is 25 times that calculated from the track density. The isotopic spectrum is identical to that calculated previously for the Pasamonte achondrite. These results uniquely associate this spectrum with in situ fission. Identification of the fissioning nucleus as Pu244 gives Pu244/U238 ≅ 1/30 at the time of xenon retention. Neither "sudden" nor "uniform" nucleosynthetic models give consistent solutions for Pu244/U238 and U235/U238.

Additional Information

©1969 The American Physical Society Received 24 April 1969 We thank Mr. J. Brown for his competent and meticulous work in obtaining the whilockite separate and in sample preparation. Frequent discussions with W. A. Fowler have been both stimulating and thought provoking. This experiment was conceived when the authors became aware of the high density of tracks and urnaium found in whitlockite by Paul Pellas[21]. We thank O. Eugster for useful comments on the manuscript. Work supported by National Science Foundation Grants Nos. GP 9433 and 9114.

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