Alpha-ray detection with a MgB transition edge sensor

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

Physica C, 468(15-20), p.1998 - 2000, 2008/09

https://doi.org/10.1016/j.physc.2008.05.114

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.