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Your search keyword '"Maehata, K."' showing total 24 results
Start Over Author "Maehata, K." Journal journal of low temperature physics
24 results on '"Maehata, K."'

17. Development of TES Microcalorimeters with Solar-Axion Converter

Author

Konno, R., primary, Maehisa, K., additional, Mitsuda, K., additional, Yamasaki, N. Y., additional, Yamamoto, R., additional, Hayashi, T., additional, Muramatsu, H., additional, Nakashima, Y., additional, Maehata, K., additional, Homma, T., additional, Saito, M., additional, Sugie, M., additional, and Sato, R., additional

Published
2019
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23. Spectroscopic Measurement of L X-Rays Emitted by Am Source by TES Microcalorimeter.

Author

Maeda, M., Yamaguchi, K., Maehata, K., Iyomoto, N., Ishibashi, K., Takasaki, K., Nakamura, K., Tanaka, K., and Yamanaka, Y.

Subjects
NUCLEAR fuels, CALORIMETERS, TRANSURANIUM elements, X-ray spectroscopy, BETA decay, PLUTONIUM isotopes, COMPARATIVE studies
Abstract

Nondestructive plutonium monitoring during reprocessing of spent nuclear fuel and in mixed-oxide-fuel fabrication facilities is expected to require spectroscopic measurements of L X-rays ranging from 10 to 20 keV. To this end, L X-ray emission intensities of transuranium elements will be important parameters in estimating the plutonium isotopic composition from L X-ray spectra. However, owing to fine structure within the L X-ray spectra, significant discrepancies exist among theoretical values, reference and experimental data concerning these emission intensities. To obtain better spectroscopic measurements, we used a TES microcalorimeter to get the energy spectrum of L X-rays emitted by Np resulting from α-decay of a Am source. Values for the L X-ray emission intensities were estimated by analyzing the spectral data and compared with previous data. We advocate for improvements in evaluation of emission intensities given the enhanced precision afforded by TES microcalorimetry. [ABSTRACT FROM AUTHOR]

Published
2012
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24. Scintillation Properties of LiI(Eu) in Cryogenic Temperatures.

Author

Yasumune, T., Kurihara, M., Maehata, K., Iyomoto, N., and Ishibashi, K.

Subjects
LOW temperature engineering, SCINTILLATION spectrometry, SCINTILLATORS, NEUTRONS spectra, RADIOACTIVE decay, WAVELENGTHS, EUROPIUM
Abstract

We measured emission wavelength spectra, scintillation decay time and scintillation light yield of LiI(Eu) in the temperature range from 4.2 K to 300 K. We observed that the scintillation decay time was almost constant (1.3 μs) below 100 K. At 4.2 K the light yield was found to increase to 6 times higher than that at 300 K. The LiI(Eu) is expected to be utilized for spectroscopic measurement of fast neutrons by operating at 4.2 K. [ABSTRACT FROM AUTHOR]

Published
2012
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