Optimized TES Microcalorimeters with 14 eV Energy Resolution at 30 keV for γ-Ray Measurements of the 229Th Isomer

H. Muramatsu, T. Hayashi, N. Yuasa, R. Konno, A. Yamaguchi, K. Mitsuda, N. Y. Yamasaki, K. Maehata, H. Kikunaga, M. Takimoto, K. Nakamura

Research output: Contribution to journalArticle

Abstract

We have developed a four-pixel array of superconducting transition-edge sensors with gold absorbers for the detection of a 29.2 keV γ-ray doublet decay from 229Th. To identify the decay, an energy resolution better than 20 eV full width at half maximum (FWHM) is needed. We measured an energy resolution of 14 eV FWHM for 26 keV γ-ray decay from an 241Am isotope in combined data of three pixels. We describe the design and the performance of the devices and discuss the baseline correction method to compensate the variation in the baseline, which was observed during the evaluation of the performance using the 241Am isotope.

Original languageEnglish
Pages (from-to)452-460
Number of pages9
JournalJournal of Low Temperature Physics
Volume200
Issue number5-6
DOIs
Publication statusPublished - 2020 Sep 1

Keywords

  • Microcalorimeter
  • TES
  • γ-Ray measurement

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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    Muramatsu, H., Hayashi, T., Yuasa, N., Konno, R., Yamaguchi, A., Mitsuda, K., Yamasaki, N. Y., Maehata, K., Kikunaga, H., Takimoto, M., & Nakamura, K. (2020). Optimized TES Microcalorimeters with 14 eV Energy Resolution at 30 keV for γ-Ray Measurements of the 229Th Isomer. Journal of Low Temperature Physics, 200(5-6), 452-460. https://doi.org/10.1007/s10909-020-02458-7