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- Title
Optimized TES Microcalorimeters with 14 eV Energy Resolution at 30 keV for γ-Ray Measurements of the 229Th Isomer.
- Authors
Muramatsu, H.; Hayashi, T.; Yuasa, N.; Konno, R.; Yamaguchi, A.; Mitsuda, K.; Yamasaki, N. Y.; Maehata, K.; Kikunaga, H.; Takimoto, M.; Nakamura, K.
- 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 229 Th. 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 241 Am 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 241 Am isotope.
- Subjects
CALORIMETERS; ISOMERS; MEASUREMENT; ISOTOPES; PIXELS; GAMMA ray spectroscopy
- Publication
Journal of Low Temperature Physics, 2020, Vol 200, Issue 5/6, p452
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-020-02458-7