Alpha-ray detection with a MgB transition edge sensor

MgB転移端型センサーを用いた線検出

岡安 悟  ; 片桐 政樹; 北條 喜一; 森井 幸生; 三木 重信*; 島影 久志*; Wang, Z.*; 石田 武和*

Okayasu, Satoru; Katagiri, Masaki; Hojo, Kiichi; Morii, Yukio; Miki, Shigenobu*; Shimakage, Hisashi*; Wang, Z.*; Ishida, Takekazu*

MgB超伝導体の超伝導転移端(TES)を利用した中性子センサーの開発を行っている。この目的のため低ノイズの測定系を開発してきた。この測定系の有用性を検証するためAmを用いた線検出を試みた。感度をかせぐため試料は1m幅で35mの長さの短いミアンダパターンを用いた。定電流モードで測定を行ったところ線の検出に成功した。バイアス電流は6Aであった。

We have been investigating for neutron detection with the MgB transition edge sensor (TES). For the purpose, we have been developing a low noise measurement system for neutron detection. To confirm the usefulness of our detecting system, alpha-ray detection from an Am source was achieved. To improve the sensitivity, short meander samples with 35 m length and 1 m width is used. Samples are fabricated by the Kansai group. Superconducting transition temperature Tc is 23.3 K. The transition width is sharp enough less than 1 K. The detection was achieved under a constant current condition, and the resistivity changes at the sample due to the alpha-ray irradiation were detected. The bias current is 6 A.