STAGE I RECOVERY SPECTRUM OF PURE COPPER IRRADIATED WITH ELECTRONS OVER THE RANGE 1.25 TO 3.25 Mev

Journal Article · Tue Dec 31 23:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.133.A288· OSTI ID:4152744

Tesk, J A; Jones, Jr, E C; Kauffman, J W

A 99.999% pure copper specimen was irradiated at 20.4 deg K with 1.25-, 1.48-, 2.15-, 2.25-, and 3.25-Mev electrons. After irradiation at each energy the specimen was isochronally annealed to 60 deg K. Electrical resistivity at 20.4 deg K was the parameter measured. The results show that Stage I recovery is more complex than previously expected. The data show eight definite recovery substages and strongly indicates that possibly nine recovery substages exist in Stage I recovery. All substages were relabeled I/sub 1/ through I/sub 9/ for convenience. The new substages confirmed were labeled I/sub 2/, I/sub 7/, and I/ sub 9/. Substage I/sub 2/ occurs at 22--23 deg K and represents 1.5 --2% recovery. Substage I/sub 2/ occurs at 45 deg K, is dosedependent, and appears more clearly resolved after the higher energy irradiations. This substage, I/sub 7/, may correspond to the bump found at about 50 deg K by Nilan and Granato. 19 occurs at 53--59 deg K, represents 1% recovery and appears to be dose-dependent. 19 occurs near the temperature of the II/sub a/ substage reported by Sosin and Neely for doped copper. The shape of the isochronal derivative on the hightemperature side of I/sub 6/ indicates that another substage, I/sub 6/, may be present. A similarity was noted between the recovery spectrum of gold and the new recovery spectrum of copper. A comparison with the results of others concerning the percent recovery associated with I/sub B/and I/sub C/ as a function of bombarding electron energy, supports the conclusion that not much change in population of I/sub B/ or I/sub c/ curs beyond E = 1.2 Mev. (auth)

• Research Organization: Northwestern Univ., Evanston, Ill.
• NSA Number: NSA-18-005832
• OSTI ID: 4152744
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 133; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

COPPER
ELECTRIC CONDUCTIVITY
ELECTRON BEAMS
ENERGY
IRRADIATION
LOW TEMPERATURE
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
RECOVERY
TEMPERATURE