Low-Temperature Annealing Spectrum of Electron-Irradiated Gold and Cadmium

Abstract

Cadmium and gold of 99.999% purity were irradiated to an integrated flux of 7.5 X10 17 electrons/cm* using 3-MeV electrons. The resistivity increase was 8.5 X10 -9 Q-cm in gold and 2.32X 10 -9 O-cm in cadmium. The resistivity versus integrated flux curve is linear. Isothermal annealing measurements were made in the region from 8 to 51°K. The resistivity annealing spectrum of gold was derived directly from the isothermal annealing curves. The spectrum consists of at least nine peaks, with 22% of the damage annealing out up to 51°K. These results confirm earlier suggestions that the radiation damage in gold is basically different from that of copper and silver. It is thought that the interstitial in gold differs from that in copper and silver. In connection with the amount of low-temperature annealing, it is thought that focusing and interstitial clustering are important. Deviations from Matthiessen's rule for gold and cadmium are in qualitative agreement with theory. Only qualitative agreement with an earlier experiment on the annealing of cadmium can be confirmed.

Stage III Annealing Study of Electron-Irradiated Pure Aluminum

“…14 The calculation of activation energy spectra for first* order processes have been carried out by Magnuson, Palmer, and Koehler, 16 by Bredt, 16 by Herschbach, 17 and by Bauer et al 18 This method has been applied to second-order processes by Dworschak, Herschbach and Koehler. 12 In the present paper work the activation energy spectra were determined under the following assumptions: (a) Independent processes are distributed in activation energy and (b) the frequency factor is constant.…”

Absorption of Light Due to Interband Transitions in Sodium

“…7 The B n i m;^ chosen so that X k are orthogonal to the core states (which we have assumed are represented by tight-binding wave functions), are given by…”

“…where, specializing to the case of Na, We have used k to denote k/1 k | 7 The radial part of u n im(r) y u n i(r), was represented in the form St A%r ni e~X ir i where A{, m, and X* were chosen to obtain a good fit to the numerically tabulated u n i(r) given by F. Herman and S. Skillman ^Atomic Structure Calculations (Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1963)].…”

Saturation Behavior of the Defect Production in Electron-Irradiated Copper Below 7.5°K

“…The results will be discussed in terms of simple spinwave theory, and also on the basis of Blume's theory of uranium dioxide. 8 We are grateful for helpful discussions with S. Pawley sistivity 3.0X10" 9 £2 cm) rolled from 99.999% ASARCO bulk material. They were mounted on the tail of a liquid-helium cryostat, electrically isolated from it by means of metallized sapphires which could be soldered to the tail and to the samples.…”