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

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 resol...

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Bibliographic Details
Published in:Journal of low temperature physics 2020-09, Vol.200 (5-6), p.452-460
Main Authors: Muramatsu, H., Hayashi, T., Yuasa, N., Konno, R., Yamaguchi, A., Mitsuda, K., Yamasaki, N. Y., Maehata, K., Kikunaga, H., Takimoto, M., Nakamura, K.
Format: Article
Language:English
Subjects:
Calorimeters
Characterization and Evaluation of Materials
Condensed Matter Physics
Decay
Energy resolution
Low temperature physics
Magnetic Materials
Magnetism
Performance evaluation
Physics
Physics and Astronomy
Pixels
Sensor arrays
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Summary: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.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-020-02458-7