Study of interatomic potentials using the crystal-GRID method on oriented single crystals of Ni, Fe, and Cr

Journal Article · Tue Feb 01 04:00:00 EST 2000 · Journal of Research of the National Institute of Standards and Technology

DOI:https://doi.org/10.6028/jres.105.009· OSTI ID:20085580

Stritt, N; Jolie, J; Jentschel, M; Boerner, H G; Doll, C

The Crystal-GRID method is used to study interatomic collisions at low energy in metals and such to probe the repulsive interatomic potential. Line shapes of gamma rays, emitted by the recoiling {sup 59}Ni isotope after thermal neutron capture in Ni single crystals, were measured and compared to results obtained by molecular dynamics simulations of the slowing down. The same procedure is also used for recoiling {sup 57}Fe and {sup 54}Cr atoms in Fe and Cr single crystals, respectively. Different potentials (including several from the embedded atom method) are investigated using the observed fine structure of the line shape which depends on the crystal orientations. From the detailed study of the lineshapes measured in two different orientations, a new potential is then derived for each element. Nuclear state lifetimes for the excited isotopes are also deduced with a higher precision than obtained with standard nuclear techniques.

• Research Organization: Universitrolles, Inst. de Physique, Fribourg (CH)
• OSTI ID: 20085580
• Journal Information: Journal of Research of the National Institute of Standards and Technology, Journal Name: Journal of Research of the National Institute of Standards and Technology Journal Issue: 1 Vol. 105; ISSN 1044-677X; ISSN JRITEF
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHROMIUM
DOPPLER BROADENING
GAMMA SPECTROSCOPY
INTERATOMIC FORCES
IRON
LIFETIME
MONOCRYSTALS
NICKEL