DYNAMICS OF RADIATION DAMAGE

Journal Article · Tue Nov 15 04:00:00 EST 1960 · Physical Review (U.S.) Superseded in part by Phys.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.120.1229· OSTI ID:4127124

Gibson, J B; Goland, A N; Milgram, M; Vineyard, G H

Radiation damage events at low and moderate energies (up to 400 ev) were studied by machine calculations in a model representing copper. Orbits of knock- on atoms were found and the resulting damaged configurations observed to consist of interstitials and vacancies. Thresholds for producing permanently displaced atoms (i.e., interstitials) were about 25 ev in the (l00) direction, 25 to 30 ev in the (110) direction, and around 85 ev in the (111) direction. Collision chains in the (100) and (110) directions were prominent. At low energies the chains focused, at higher energies they defocused. Above threshold, the chains transported matter, as well as energy, and produced an interstitial it a distance. The range of (110) chains was studied in detail. Localized vibrational modes associated with interstitials, agitations qualitatively like thermal spikes, ring annealing processes, and a higher energy process somewhat like a displacement spike were observed. Replacements were found to be very numerous. The configurations of various static defects were also studied in this model. The interstitial was found to reside in a "split" configuration, sharing a lattice site with another atom. The crowdion was found not to be stable, and Frenkel pairs were stable only beyond minimum separations, which were found to be very much dependent on orientation. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-003175
• OSTI ID: 4127124
• Report Number(s): BNL-4871; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 120; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

ACTIVATION
ANNEALING
ATOMS
COLLISIONS
COMPUTERS
COPPER
CRYSTALS
DEFECTS
ENERGY
FRENKEL PAIRS
INTERSTITIALS
LATTICES
METALS, CERAMICS, AND OTHER MATERIALS
ORBITS
QUANTITATIVE ANALYSIS
RADIATION EFFECTS
THERMAL SPIKES
THERMAL STRESSES
TRANSIENTS
VACANCIES
VIBRATIONS