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Gamma ray induced positron annihilation spectroscopy at UVSOR-III

UVSOR-IIIにおけるガンマ線誘起陽電子消滅分光法

平 義隆*; 杉田 健人*; 岡野 泰彬*; 平出 哲也  

Taira, Yoshitaka*; Sugita, Kento*; Okano, Yasuaki*; Hirade, Tetsuya

時間分解能140ピコ秒のガンマ線誘起陽電子消滅寿命分光法(GiPALS)を開発した。このシステムは8個のBaF$$_{2}$$シンチレーション検出器と2つのデジタルオシロスコープによって構成されており、現在ユーザーに公開されている。GiPALSに加え、さらにガンマ線誘起陽電子消滅寿命-運動量相関(GiAMOC)も開発した。超短パルスガンマ線の発生方法、GiPALSとGiAMOCシステムの詳細と今後の計画、さらに、スピン偏極ガンマ線によるスピン偏極陽電子源開発について述べる。

We have developed the gamma-ray induced positron annihilation lifetime spectroscopy (GiPALS) with a time resolution of 140 ps. It has eight BaF$$_{2}$$ detectors and two digital oscilloscopes currently available for users. In addition to GiPALS, we have developed gamma-ray induced age-momentum correlation (GiAMOC). We will present a generation method of the ultra-short pulsed gamma-rays, details of GiPALS and GiAMOC, and future plans, including the development of a spin-polarized positron source generated from circularly polarized gamma rays.

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