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Journal Articles

Alpha-ray detection with a MgB$$_{2}$$ 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
 Times Cited Count：0 Percentile：0(Physics, Applied)

We have been investigating for neutron detection with the MgB $$_{2}$$ 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 $$^{241}$$Am source was achieved. To improve the sensitivity, short meander samples with 35 $$mu$$m length and 1 $$mu$$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 $$mu$$A.

Journal Articles

Superconducting MgB$$_2$$ thin film detector for neutrons

Ishida, Takekazu*; Nishikawa, Masatoshi*; Fujita, Yoshifumi*; Okayasu, Satoru; Katagiri, Masaki*; Sato, Kazuo*; Yotsuya, Tsutomu*; Shimakage, Hisashi*; Miki, Shigehito*; Wang, Z.*; et al.

Journal of Low Temperature Physics, 151(3-4), p.1074 - 1079, 2008/05

https://doi.org/10.1007/s10909-008-9790-x
 Times Cited Count：36 Percentile：78.05(Physics, Applied)

The superconducting neutron detector using high-quality $$^{10}$$B-enriched MgB$$_2$$ thin films at higher operating temperatures has been proposed, where a resistance change induced by the nuclear reaction of neutron and $$^{10}$$B in MgB$$_2$$ is used to detect a neutron. Cold neutrons from a nuclear research reactor irradiated the MgB$$_2$$ detector, and the output voltage was clearly observed through a low-noise amplifier by using a digital oscilloscope. The out-of-equilibrium thermodynamics was investigated by means of the time-dependent Ginzburg-Landau equations by using the Earth Simulator.

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