Faculty Profiles - SHIMIZU Hirohiko

Papers - SHIMIZU Hirohiko

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Characteristics of superconducting series array tunnel junctions for heavy ions

Sato, H; Kurakado, M; Takizawa, Y; Shiki, S; Ohno, M; Shimizu, HM; Morita, K; Morimoto, K; Kaji, D; Akiyama, T

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY Vol. 15 ( 2 ) page： 595 - 598 2005.6

Publisher：IEEE Transactions on Applied Superconductivity

Heavy ion detection experiments were carried out with superconducting series array tunnel junctions. 40Ar beam from linear accelerator was introduced to a cryostat and stopped in a substrate on which series array tunnel junctions were fabricated. An energy resolution of 4.2% was obtained for 191 MeV 40 Ar, but linearity proved poor for energy ranges from 136 MeV to 191 MeV. © 2005 IEEE.

DOI： 10.1109/TASC.2005.849951

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The effect of X-ray irradiating superconducting tunnel junctions on Al <inf>2</inf>O<inf>3</inf> and LiNbO<inf>3</inf> substrates

Taino T., Hoshino K., Nakano R., Otani C., Myoren H., Kawase K., Sato H., Shimizu H.M., Takada S.

IEEE Transactions on Applied Superconductivity Vol. 15 ( 2 PART I ) page： 599 - 601 2005.6

Publisher：IEEE Transactions on Applied Superconductivity

We have developed a phononmediated radiation detector using Nb-based superconducting tunnel junctions (STJs). The STJs are fabricated on a substrate as an absorber of the radiation, and a substantial amount of emergent phonons with an energy above the energy gap are detected. The performance of the detector depends on the collection efficiency of the phonons. A selection of an appropriate substrate is required for optimizing the detector performance. We fabricated Nb-based STJs on a Al2O3 and a LiNbO 3 substrates, and compared the pulse heights of substrate phonon events due to X-ray irradiation to the substrates. We found that the maximum pulse height of the phonon events for the LiNbO3 substrate was about twice of that for the Al2O3 substrate, so that these spectra which was obtained from two STJs showed different shapes, especially the peak due to phonon events. © 2005 IEEE.

DOI： 10.1109/TASC.2005.849953

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Development of a Nb_3Sn Coil for a Magnetic Neutron Lens (2)

OKAMOTO K., NAKAMURA K., SEKI Y., OHNO M., TAKAO T., OHUCHI N., SHINTOMI T., TSUCHIYA K., ADACHI T., SHIMIZU H., OKU T., SUZUKI J., KIMURA S., HANAI S., URATA M., WATANABE I.

Vol. 72 page： 212 2005.5

CS-7-3 THz DETECTOR USING STJ WITH SUBSTRATE ABSORBER

Myoren Hiroaki, Nakano Ran, Hoshino Koichi, Yoshimura Shota, Taino Tohru, Otani Chiko, Shibuya Takayuki, Sato Hiromi, Shimizu Hirohiko M., Takada Susumu, Kawase Kodo

Proceedings of the IEICE General Conference Vol. 2005 ( 2 ) page： "S - 13"-"S-14" 2005.3

Detection of α particles with superconducting series-junction detectors -: art. no. 083503

Kurakado, M; Sato, H; Takizawa, Y; Shiki, S; Shimizu, HM

APPLIED PHYSICS LETTERS Vol. 86 ( 8 ) page： 1 - 3 2005.2

Publisher：Applied Physics Letters

Superconducting series-junction detectors present the possibility of highly practical radiation detectors with high detection efficiencies, high count rates, and high energy-resolution even for radiation that is difficult to detect efficiently with traditional radiation detectors. A series-junction detector with an effective volume of 8×8×0.4 mm3 has shown that the efficiency of signal charge production is high despite its large volume. The position dependence of signal heights of a series-junction detector with an effective area of 1.5×1.5 mm2 was corrected, and the energy resolution was improved from 2.9% to 0.42%. © 2005 American Institute of Physics.

DOI： 10.1063/1.1866509

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Development of polarized neutron optics

Shimizu, HM; Oku, T; Suzuki, J; Furusaka, M; Kiyanagi, Y

PHYSICA B-CONDENSED MATTER Vol. 356 ( 1-4 ) page： 121 - 125 2005.2

A demonstration study of focusing geometry SANS using a magnetic lens

Oku, T; Suzuki, J; Sasao, H; Yamada, S; Furusaka, M; Adachi, T; Shinohara, T; Ikeda, K; Shimizu, HM

PHYSICA B-CONDENSED MATTER Vol. 356 ( 1-4 ) page： 126 - 130 2005.2

Publisher：Physica B: Condensed Matter

A demonstration study of focusing geometry small-angle neutron scattering (FSANS) experiment was successfully performed using a superconducting sextupole magnet as a neutron focusing device and a polarized cold neutron beam. The obtained small-angle neutron scattering intensities from monodispersed SiO 2 spherical particles were discussed in terms of the scattering function taking into account the q-resolution. © 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2004.10.062

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Transmission bender for polarizing neutrons

Krist, T; Peters, J; Shimizu, HM; Suzuki, J; Oku, T

PHYSICA B-CONDENSED MATTER Vol. 356 ( 1-4 ) page： 197 - 200 2005.2

Publisher：Physica B: Condensed Matter

A system of a polarizing solid state bender and a collimator was built and tested. The bender consists of a stack of thin silicon wafers coated with polarizing FeCo-Si supermirrors. The stack is deflected in the middle by one wafer thickness. Inserted in an unpolarized neutron beam this device works as a spin splitter by transmitting the spin down component without any change in its flight path and reflecting the spin up component. With a collimator behind the bender it can be selected which one of the spin components is transmitted. In this way a transmission polarizer for neutrons with wavelengths above 4 Å was built which has a total length of less than 10 cm. © 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2004.10.076

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Some experimental studies on time-of-flight radiography using a pulsed neutron source Open Access

Kiyanagi, Y; Sakamoto, N; Iwasa, H; Kamiyama, T; Hiraga, F; Sato, S; Sagehashi, H; Ino, T; Furusaka, M; Suzuki, J; Gorin, A; Manuilov, I; Ryazantsev, A; Kuroda, K; Sakai, K; Tokanai, F; Miyasaka, H; Adachi, T; Oku, T; Ikeda, K; Suzuki, S; Morimoto, K; Shimizu, HM

IEEE TRANSACTIONS ON NUCLEAR SCIENCE Vol. 52 ( 1 ) page： 371 - 374 2005.2

Publisher：IEEE Transactions on Nuclear Science

We are developing a fiber type two-dimentional (2-D) position-sensitive detector having a spatial resolution less than 0.5 mm in order to use it in the time-of-flight (TOF) measurements. The detector performance was examined, and some experiments on the TOF radiography were performed using this detector. The results indicated that the detector could be applied successfully to the TOF measurement and that the TOF radiography was very useful since it gave more informative data than those obtained by the conventional radiography using a broad energy band. © 2005 IEEE.

DOI： 10.1109/TNS.2005.844299

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Boron based oxide scintillation glass for neutron detection

Ishii, M; Kuwano, Y; Asai, T; Asaba, S; Kawamura, M; Senguttuvan, N; Hayashi, T; Kobayashi, M; Nikl, M; Hosoya, S; Sakai, K; Adachi, T; Oku, T; Shimizu, HM

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 537 ( 1-2 ) page： 282 - 285 2005.1

Publisher：Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

The luminescence property of Ce-doped oxide glass having B and Li with large absorption coefficient for neutron was investigated by optical transmittance, alpha particle, and neutron irradiation. The light output of the B 2O 3-Li 2O:CeO 2 glass system increased with the increase in B 2O 3 and CeO 2. It was observed that the decay time which showed composition dependence varied in the range 30-45 ns. Although the light output by neutron irradiation is 9.2% of Li-glass, low density and high neutron absorption with short decay time make this new boron-based glass scintillator useful for neutron detection. (c) 2001 Elsevier Science. All rights reserved © 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2004.08.027

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13pSE-2 Detection of quantum effect do to earth gravity by using UCN

Kawasaki Shinsuke, Sanuki Tomoyuki, Okawa Hideki, Sonoda Shinya, Komamiya Sachio, Higashi Yasuo, Kume Tatsuya, Enami Kazuhiro, Hino Masahiro, Shimizu Hirohiko

Meeting Abstracts of the Physical Society of Japan Vol. 60.2.1 ( 0 ) page： 14 2005

27aWH-3 Development of low energy particle detector using superconducting transition edge sensor (TES)

Ohno M., Sato H., Takizawa Y., Shiki N., Kurakado M., Ariyoshi S., Mishima K., Ikeda T., Shimizu H. M.

Meeting Abstracts of the Physical Society of Japan Vol. 60.1.1 ( 0 ) page： 81 2005

27aWH-1 A test experiment for neutron beta decay measurement

Mishima Kenji, Yamada Satoru, Hirota Katsuya, Shinohara Takenao, Shiki Shigetomo, Sato Hiromi, Ohono Masashi, Suzuki Jun-ichi, Shimizu Hirohiko M.

Meeting Abstracts of the Physical Society of Japan Vol. 60.1.1 ( 0 ) page： 80 2005

26pZA-5 Measurements of the photon beam asymmetry for the π^0 and η photoproduction at the SPring-8/LEPS beam line

Kino K., Ishikawa T., Okamura K., Saito Y., Shimizu H., Suzuki K., Yonemura H., Iwata T., Kawamura T., Tajima Y., Yoshida H. Y., Toi Y., Matsuda T., Uchida M., Kohri H., Sumihama M., Hasegawa S., Hotta T., Matsumura T., Nakano T., Shiino Y., Fujimura H., Hicks Kenneth, Niiyama M., Miyabe M., Muramatsu N., Sugaya Y., Ohashi Y., Date S., Yorita T., Tsuru T.

Meeting Abstracts of the Physical Society of Japan Vol. 60.1.1 ( 0 ) page： 77 2005

25aYS-2 Development of Neutron Focusing Devices using Supermirrors with a Parabolic Surface for Thermal and Cold Neutrons

Ikeda K., Adachi T., Shinohara T., Morishima T., Hirota K., Mishima K., Sato H., Shimizu H. M., Morita S., Guo J., Suzuki T., Uehara Y., Lin W., Ohmori H., Hino M., Tasaki S., Oku T., Suzuki J., Soyama K., Ohoyama K., Hiraka H.

Meeting Abstracts of the Physical Society of Japan Vol. 60.1.4 ( 0 ) page： 907 2005

24pWJ-11 Detector of Quantum effect due to gravity by using UCN

Kawasaki Shinsuke, Sanuki Tomoyuki, Okawa Hideki, Sekiguti Toyokazu, Komamiya Satio, Hino Masahiro, Shimizu Hirohiko, Higashi Yasuo, Kume Tatsuya, Enami Kazuhiro

Meeting Abstracts of the Physical Society of Japan Vol. 60.1.1 ( 0 ) page： 22 2005

13pSE-3 Detection of quantum effect do to earth gravity by using UCN

Sonoda Shinya, Kawasaki Shinsuke, Okawa Hideki, Komamiya Sachio, Hino Masahiro, Shimizu Hirohiko, Sanuki Tomoyuki

Meeting Abstracts of the Physical Society of Japan Vol. 60.2.1 ( 0 ) page： 14 2005

A possible cosmic ray source in TeV and EeV from the direction around the Cygnus Loop

Takeda M., Nagano M., Watanabe Y., Chikawa M., Fukushima M., Hayashida N., Honda K., Inoue N., Kadota K., Kakimoto F., Kamata K., Kawaguchi S., Kawakami S., Kawasaki Y., Kawasumi N., Mase K., Mizobuchi S., Ohoka H., Osone S., Sakaki N., Sakurai N., Sasano M., Shimizu H.M., Shinozaki K., Teshima M., Torii R., Tsushima I., Uchihori Y., Yamamoto T., Yoshida S., Yoshii H.

29th International Cosmic Ray Conference, ICRC 2005 Vol. 7 page： 179 - 182 2005

Publisher：29th International Cosmic Ray Conference, ICRC 2005

With the Akeno Giant Air Shower Array (AGASA), we published the small-scale anisotropy of cosmic rays with energies above 1019 eV. Among them, a broad cluster - BC1 around (20h 50m, 32°) - has interesting characteristics: The time distribution of members of the BC1 cluster is burst-like around MJD50000 , and this cluster locates near the famous supernova remnant: the Cygnus Loop. From this BC1 direction, two observations from the Tibet and Milagro experiments have been reported. In this report, we summarize the results from the whole observation time of AGASA and the Akeno 1km2 array experiment, and the relation with the observations from the Tibet and Milagro experiments is discussed.

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Development of a neutron detector based on a position-sensitive photomultiplier

Hirota, K; Shinohara, T; Ikeda, K; Mishima, K; Adachi, T; Morishima, T; Satoh, S; Oku, T; Yamada, S; Sasao, H; Suzuki, J; Shimizu, HM

PHYSICAL CHEMISTRY CHEMICAL PHYSICS Vol. 7 ( 8 ) page： 1836 - 1838 2005

Publisher：Physical Chemistry Chemical Physics

A neutron scintillation detector based on a position-sensitive photomultiplier has been developed for neutron spin echo and small angle neutron scattering measurements. This photomultiplier has good spatial resolution, less than 1 mm2. The detection efficiency of gamma ray background is very low for using a thin ZnS/6LiF scintillator. The effective area of this detector is around 60 cm2. © The Owner Societies 2005.

DOI： 10.1039/b417838f

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PubMed

Detection of direct and indirect terahertz waves using a Nb-based superconducting tunnel junction

Otani, C; Nakano, R; Taino, T; Shibuya, T; Ariyoshi, S; Myoren, H; Sato, H; Shimizu, HM; Takada, S; Kawase, K

IRMMW-THz2005: The Joint 30th International Conference on Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics, Vols 1 and 2 page： 263 - 264 2005

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Papers - SHIMIZU Hirohiko