Angular Correlation Apparatus of Positron Annihilation and Application to the Study on Copper Alloys

概要

論文の詳細を見る
The angular correlation apparatus of positron annihilation was constructed for the study of the Fermi surfaces (F.S.) in various materials under various conditios. This apparatus has the advantages in the aspects that the 'crossslit geomety' is involved and that the study of liquid state as well as solid state is possible. Its application to the study on several Cu-based alloys has shown satisfactory performance for our purpose. The angular correlation curves of β'-brass, 0.8 Cu-0.2 Ni and 0.6 Cu-0.4 Ni single crystals were measured. In the preliminay experiments, the following results were obtained: (1) the F. S. of β'-brass has the necks in <110> directions, (2) in 0.8 Cu-0.2 Ni, the radius of the of the <111> neck seems to be about 0.5 mrad., so that about 0.4 electrons per atom of Ni may be contributed to the conduction band. Further, the possibility of, the production of much stronger ^<58>Co postiron source was discussed.
1971-12-05