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Sealed-off helium-filled proportional counter for the conversion electron Mössbauer spectroscopy

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Abstract

Conversion electron Mössbauer spectroscopy (CEMS) is a surface-sensitive technique because of the shallowness of the escape depth of conversion electrons. The proportional counter with the sample built-in is usually used for CEMS with a flow of He mixed with a quenching gas. This flow-type proportional counter with a mixed gas, however, is not suited to high-temperature measurements. For high-temperature operation, we fabricated a sealed-off proportional counter operated above 850 K for CEMS, which is filled with pure He at a pressure of 1–8 × 104 Pa. The distribution of the output pulse voltage revealed an inflection point suggesting that two multiplication mechanisms are operative. The multiplication factor of the proportional counter was estimated to be about 104–105. By means of the fabricated proportional counter, we investigated the magnetic phase transition of Fe3O4, whose Curie temperature is 858 K. We successfully observed the ferromagnetic-paramagnetic phase transition without the reduction of the sample.

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Authors and Affiliations

  1. Institute of Industrial Science, The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo, 153-8505, Japan

    Taizo Kawauchi, Kanta Asakawa & Katsuyuki Fukutani

Authors
  1. Taizo Kawauchi
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  2. Kanta Asakawa
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  3. Katsuyuki Fukutani
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Correspondence to Taizo Kawauchi.

Additional information

This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2017), Saint-Petersburg, Russia, 3–8 September 2017

Edited by Valentin Semenov

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Kawauchi, T., Asakawa, K. & Fukutani, K. Sealed-off helium-filled proportional counter for the conversion electron Mössbauer spectroscopy. Hyperfine Interact 238, 75 (2017). https://doi.org/10.1007/s10751-017-1451-5

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  • DOI: https://doi.org/10.1007/s10751-017-1451-5

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