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Spectroscopic Signature of Aging in δ-Pu(Ga)

Published online by Cambridge University Press:  26 February 2011

Brandon Chung ,
Adam Schwartz ,
Bartley Ebbinghaus ,
Michael Fluss ,
Jeffrey Haslam ,
Kerri Blobaum  and
James Tobin
Brandon Chung
Affiliation:
chung7@llnl.gov, Lawrence Livermore National Laboratory, P.O. Box 808, 7000 East Avenue, Livermore, CA, 94551, United States
Adam Schwartz
Affiliation:
schwartz6@llnl.gov, United States
Bartley Ebbinghaus
Affiliation:
ebbinghaus1@llnl.gov, United States
Michael Fluss
Affiliation:
fluss1@llnl.gov, United States
Jeffrey Haslam
Affiliation:
haslam2@llnl.gov, United States
Kerri Blobaum
Affiliation:
blobaum1@llnl.gov, United States
James Tobin
Affiliation:
tobin1@llnl.gov, United States
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Abstract

Plutonium, because of its radioactive nature, ages from the “inside out” by means of self-irradiation damage and thus produces nanoscale internal defects. The self-irradiation induced defects come in the form of Frenkel-type defects (vacancies and self-interstitial atoms), helium in-growth, and defect clusters. At present there are neither experimental nor theoretical models describing the changes in the electronic structure caused by the aging in Pu. This fact appears to be associated primarily with the absence of reasonably convincing spectroscopic evidence of the changes. This paper demonstrates that Resonant Photoemission, a variant of Photoelectron Spectroscopy, has strong sensitivity to aging of Pu samples. The spectroscopic results are correlated with an extra-atomic screening model, and are shown to be the fingerprint of mesoscopic or nanoscale internal damage in the Pu physical structure. This means that a spectroscopic signature of internal damage due to aging in Pu has been established.

Keywords

Puphotoemissionelectronic structure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 893: Symposium JJ – Actinides 2005 – Basic Science, Applications and Technology , 2005 , 0893-JJ03-04
Copyright
Copyright © Materials Research Society 2006

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References

REFERENCES

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