Long-Slit Rotating-Specimen Measurement of the Annihilation Radiation from Copper Single Crystals

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概要

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• Anisotropic distribution of the collinear pairs of photons from positron annihilation in a Cu single crystal has been measured around the $\langle 100\rangle$ axis with a conventional long-slit system. A method for the evaluation of the neck radius of the Fermi surface from the slope of the counting rate of the collinear photon pairs plotted against the azimuth angle around $\langle 100\rangle$ is presented and has been applied to Cu as a test case. The neck radius of Cu thus determined has been found to agree with that given by Halse. The observed anisotropy is larger than that expected from the topology of the Fermi surface with a Wigner-Seitz evaluation of the higher momentum components. This result suggests the anomalous enhancement of the annihilation rate of the neck electrons.

• 社団法人日本物理学会の論文
• 1975-06-15

著者

• Akahane Takashi

  Institute Of Physics College Of General Education The University Of Tokyo

• Akahane Takashi

  Institute Of Physics College Of General Education University Of Tokyo:(prsent Address) National Inst

関連論文

• A Positron-Annihilation Study of α-Phase Copper-Aluminum Alloys
• A Comparison between the Anisotropy of the Counting Rate of the Collinear Annihilation-Photon Pairs and the Topology of the Fermi Surface in Cu
• Long-Slit Rotating-Specimen Measurement of the Annihilation Radiation from Copper Single Crystals

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