The K-absorption spectrum of neutron irradiated nickel
Presented are the results from an investigation of the manner in which the K-absorption spectrum of nickel is modified when the integral irradiation flux of the absorber and the spectral composition of the incident beam are varied. Neutron irradiation causes a structural change in the K-absorption discontinuity of nickel. A comparison of results reveals that the observed modifications are caused by neutrons with energy above 0.7 ev. (B.O.G.) 880l The expansion of alkali halides due to x-ray irradiation was observed at 90 deg and 300 deg K. Simultaneous measurements of the F band indicate that the expansion can be roughly explained on the basis of the generation of negative ion vacancies. Partial annealing of the expansion of LiF at approximately 130 deg K after irradiation at 90 deg K is not accompanied by a decrease in the density of negative ion vacancies associated with F centers, indicating that the expansion cannot be completely due to the increase in the density of F centers. The low- temperature annealing of the expansion can be associated with either vacancy pair diffusion or interstitial motion. While experiments with plastic deformation and M band formation in LiF argue against vacancy pair diffusion, the spin resonance experiments of Kanzig and Woodruff support the interstitial interpretation. It is therefore tentatively concluded that halogen vacancy interstitial pairs are generated by x-ray irradiation in LiF at 90 deg K and that the low-temperature annealing is due to a change in interstitial configuration.
- Research Organization:
- Inst. of Atomic Physics, Bucharest
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-008800
- OSTI ID:
- 4193435
- Journal Information:
- Nuovo Cimento, Journal Name: Nuovo Cimento Journal Issue: 6 Vol. 14; ISSN 0029-6341
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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