Energy of the Th nuclear clock isomer determined by absolute -ray energy difference

Yamaguchi, Atsushi*; Muramatsu, Haruka*; Hayashi, Tasuku*; Yuasa, Naoki*; Nakamura, Keisuke; Takimoto, Misaki; Haba, Hiromitsu*; Konashi, Kenji*; Watanabe, Makoto*; Kikunaga, Hidetoshi*; et al.

Physical Review Letters, 123(22), p.222501_1 - 222501_6, 2019/11

https://doi.org/10.1103/PhysRevLett.123.222501

Response of a superconducting transition-edge sensor microcalorimeter with a mushroom-shaped absorber to L X-rays emitted by transuranium elements

Maehata, Keisuke*; Maeda, Makoto; Iyomoto, Naoko*; Ishibashi, Kenji*; Nakamura, Keisuke; Aoki, Katsunori; Takasaki, Koji; Mitsuda, Kazuhisa*; Tanaka, Keiichi*

IEICE Transactions on Electronics (Internet), E98-C(3), p.178 - 185, 2015/03

https://doi.org/10.1587/transele.E98.C.178

A four-pixel-array superconducting transition-edge sensor (TES) microcalorimeter with a mushroom-shaped absorber was fabricated for the energy dispersive spectroscopy performed on a transmission electron microscope. The TES consists of a bilayer of Au/Ti with either a 120-nm or 50-nm thickness. The absorber of 5.0 m thick is made from a Au layer and its stem is deposited in the center of the TES surface. A TaO insulating layer of 100-nm thickness is inserted between the overhang region of the absorber and the TES surface. A selected pixel of the TES microcalorimeter was operated for the detection of L X rays emitted from an Am source. A response of the TES microcalorimeter to L X rays was obtained by analyzing detection signal pulses with using the optimal filter method. An energy resolution was obtained to be 33 eV of the full width at half maximum value at 17.751 keV. Response to L X rays emitted from a mixture source of Pu, Pu and Am was obtained by operating the selected pixel of the TES microcalorimeter Major L X-ray peaks of progeny elements of decay of Pu and Am isotopes were clearly identified in the obtained energy spectrum. The experimental results demonstrated the separation of Am and plutonium isotopes by L X-ray spectroscopy.

Uniaxial-pressure control of magnetic phase transitions in a frustrated magnet CuFeGaO ( = 0, 0.018)

Nakajima, Taro*; Mitsuda, Setsuo*; Takahashi, Keiichiro*; Yoshitomi, Keisuke*; Masuda, Kazuya*; Kaneko, Chikafumi*; Homma, Yuki*; Kobayashi, Satoru*; Kitazawa, Hideaki*; Kosaka, Masashi*; et al.

Journal of the Physical Society of Japan, 81(9), p.094710_1 - 094710_8, 2012/09

https://doi.org/10.1143/JPSJ.81.094710

The Spectroscopy of LX-rays emitted from transuranium element using transition edge sensor microcalorimeter

Nakamura, Keisuke; Maeda, Makoto*; Aoki, Katsunori; Yasumune, Takashi; Takasaki, Koji; Maehata, Keisuke*; Iyomoto, Naoko*; Ishibashi, Kenji*; Mitsuda, Kazuhisa*; Tanaka, Keiichi*

no journal, , 

no abstracts in English

Development of a microcalorimeter for measurement of L X-rays emitted from transuranium elements

Nakamura, Keisuke; Maeda, Makoto; Maehata, Keisuke*; Iyomoto, Naoko*; Ishibashi, Kenji*; Takasaki, Koji; Mitsuda, Kazuhisa*

no journal, , 

A transition-edge-sensor (TES) microcalorimeter has been developed for measurement of X-rays and -rays with ultra-high energy resolution. In this work, we developed a four-pixel TES microcalorimeter to measure L X-rays emitted by transuranium elements. Each TES was composed of bilayer film of a 120-nm-thick Au layer and a 50-nm-thick Ti layer, and the transition temperature was approximately 130 mK. An absorber deposited on each Au-Ti bilayer was a 5-m-thick layer of Au to achieve an absorption efficiency of 35-80% for the energy range of L X-rays (10-30 keV). The developed four pixel TES microcalorimeter was irradiated with L X-rays emitted form Pu-238, Pu-239, and Am-241 sources. As the result, we obtained an L X-ray energy spectrum with high energy resolution of 40 eV (full width at half maximum) for an L X-ray of 17.75 keV.

High-resolution spectrometry of transuranium elements using the TES microcalorimeter

Nakamura, Keisuke; Sugimoto, Tetsuya*; Maehata, Keisuke*; Iyomoto, Naoko*; Ishibashi, Kenji*; Morishita, Yuki; Takasaki, Koji; Mitsuda, Kazuhisa*

no journal, , 

no abstracts in English

Challenge to improve the Th isomer energy measurement with TES calorimeters

Tanaka, Keita*; Hirano, Kosuke*; Yamaguchi, Atsushi*; Muramatsu, Haruka*; Hayashi, Tasuku*; Yuasa, Naoki*; Nakamura, Keisuke; Takimoto, Misaki; Haba, Hiromitsu*; Shirasaki, Kenji*; et al.

no journal, , 

Spectroscopic measurement of LX-rays emitted by transuranium elements using TES microcalorimeter

Maeda, Makoto*; Maehata, Keisuke*; Iyomoto, Naoko*; Ishibashi, Kenji*; Takasaki, Koji; Nakamura, Keisuke; Aoki, Katsunori; Mitsuda, Kazuhisa*; Tanaka, Keiichi*

no journal, , 

no abstracts in English

Detailed analysis of magnetic and crystalline structure of multiferroic CuFeGaO by means of CRYOPAD and RXS

Kaneko, Chikafumi*; Nakajima, Taro*; Mitsuda, Setsuo*; Terada, Noriki*; Wakimoto, Shuichi; Takeda, Masayasu; Kakurai, Kazuhisa; Tanaka, Yoshikazu*

no journal, , 

no abstracts in English