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UVSOR-IIIにおけるガンマ線誘起陽電子寿命; 運動量相関測定法の開発

Development of gamma-ray-induced positron age-momentum correlation measurement method in UVSOR-III

山本 涼平*; 平 義隆*; 杉田 健人*; 平出 哲也  ; 高嶋 圭史*; 加藤 政博*

Yamamoto, Ryohei*; Taira, Yoshitaka*; Sugita, Kento*; Hirade, Tetsuya; Takashima, Yoshifumi*; Kato, Masahiro*

陽電子消滅分光法は、結晶の単原子空孔型欠陥や絶縁材料中の微小空隙の測定を行える強力な分析手法である。分子科学研究所UVSOR-IIIでは、超短パルスガンマ線を用いたガンマ線誘起陽電子消滅分光法(Gamma-ray induced positron annihilation spectroscopy: GiPAS)の開発を行っている。具体的な測定手法として陽電子寿命測定と寿命運動量相関測定に成功しており、今回、ひずみを入れた鉄鋼材料の寿命運動量相関測定において、欠陥捕獲される過程の検出に成功した。

Positron annihilation spectroscopy is a powerful analytical method that can observe single-atom vacant defects in crystals and microvoids in insulating materials. UVSOR-III installed at the Institute of Molecular Science is promoting the development and user use of Gamma-ray induced positron annihilation spectroscopy (GiPAS) by ultrashort pulse gamma rays. We have succeeded in positron lifetime measurement and lifetime momentum correlation measurement. This time, we succeeded in detecting the process of defect capture in the positron age-momentum correlation measurement of strained steel materials.

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