Recoil Gold Atoms from Fast-Neutron Bombardment
- 15 March 1966
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 37 (4), 1890-1892
- https://doi.org/10.1063/1.1708619
Abstract
Gold foils were irradiated with fast neutrons from a Pu‐Be neutron source and the gold atoms knocked out of these foils were collected on aluminum foils. Sets of Au‐Al foils were placed at various angles around the Pu‐Be source. Some foil sets had the gold foil nearer the neutron source; some had the aluminum foil nearer. In this way, both the ejection of gold atoms from open‐ended displacement spikes and the sputtering of gold atoms by fast neutrons could be studied. As was expected, no 198Au was detected on the Al foils because of the small (n,γ) cross section of 197Au. After neutron activation in a nuclear reactor, all the Al foils emitted the 0.412‐MeV gamma ray of 198Au. Calculations showed that each Al foil had approximately 1012 197Au atoms on it. Since the Pu‐Be neutron source strength was known, the number of gold atoms ejected per open‐ended displacement spike was calculated and found to be of the order of magnitude of 106. Focusing collisions may account for the large number of Au atoms per open‐ended displacement spike. The sputtering ratio was found to be about 0.5 gold atoms sputtered per incident neutron.Keywords
This publication has 6 references indexed in Scilit:
- Displacement spike crystallization of amorphous germanium during irradiationJournal of Physics and Chemistry of Solids, 1964
- Evidence for heated spikes in bombarded gold from the energy spectrum of atoms ejected by 43 kev a+and xe+ionsPhilosophical Magazine, 1962
- Neutrons from (α, n) sourcesAnnals of Physics, 1959
- The ejection of atoms from gold crystals during proton irradiationPhilosophical Magazine, 1959
- Neutron Spectrum and Absolute Yield of a Plutonium-Beryllium SourcePhysical Review B, 1955
- On the Nature of Radiation Damage in MetalsJournal of Applied Physics, 1954