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Journal Articles

Kinetic inductance neutron detector operated at near critical temperature

Vu, TheDang; Nishimura, Kazuma*; Shishido, Hiroaki*; Harada, Masahide; Oikawa, Kenichi; Miyajima, Shigeyuki*; Hidaka, Mutsuo*; Oku, Takayuki; Soyama, Kazuhiko; Aizawa, Kazuya; et al.

Journal of Physics; Conference Series, 1590, p.012036_1 - 012036_9, 2020/07

Journal Articles

Temperature dependent characteristics of neutron signals from a current-biased Nb nanowire detector with $$^{10}$$B converter

Vu, TheDang; Iizawa, Yuki*; Nishimura, Kazuma*; Shishido, Hiroaki*; Kojima, Kenji*; Oikawa, Kenichi; Harada, Masahide; Miyajima, Shigeyuki*; Hidaka, Mutsuo*; Oku, Takayuki; et al.

Journal of Physics; Conference Series, 1293, p.012051_1 - 012051_9, 2019/10

Journal Articles

Completion of solidification and stabilization for Pu nitrate solution to reduce potential risks at Tokai Reprocessing Plant

Mukai, Yasunobu; Nakamichi, Hideo; Kobayashi, Daisuke; Nishimura, Kazuaki; Fujisaku, Sakae; Tanaka, Hideki; Isomae, Hidemi; Nakamura, Hironobu; Kurita, Tsutomu; Iida, Masayoshi*; et al.

Proceedings of 2017 International Congress on Advances in Nuclear Power Plants (ICAPP 2017) (CD-ROM), 8 Pages, 2017/04

TRP has stored the plutonium in solution state for long-term since the last PCDF operation in 2007 was finished. After the great east Japan earthquake in 2011, JAEA had investigated the risk against potential hazard of these solutions which might lead to make hydrogen explosion and/or boiling of the solution accidents with the release of radioactive materials to the public when blackout. To reduce the risk for storing Pu solution (about 640 kg Pu), JAEA planned to perform the process operation for the solidification and stabilization of the solution by converted into MOX powder at PCDF in 2013. In order to perform PCDF operation without adaption of new safety regulation, JAEA conducted several safety measures such as emergency safety countermeasures, necessary security and safeguards (3S) measures with understanding of NRA. As a result, the PCDF operation had stared on 28th April, 2014, and successfully completed to convert MOX powder on 3rd August, 2016 for about 2 years as planned.

Journal Articles

Photoluminescence properties of carbon-doped $$beta$$-FeSi$$_{2}$$ nanocrystals

Maeda, Yoshihito; Nishimura, Kentaro*; Nakajima, Takahito*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji

Physica Status Solidi (C), 9(10-11), p.1884 - 1887, 2012/10

 Times Cited Count:4 Percentile:7.22

We report enhancement of intrinsic photoluminescence (PL) from $$beta$$-FeSi$$_{2}$$ nanocrystals by doping carbon. In the appropriate dose of C$$_{60}$$$$^{+}$$ ion implantation into the average nanocrystal size of 14 nm, the PL intensity was enhanced by 260% and increase of the exciton binding energy of 1.8 meV in comparison with that of the non-doped nanocrystal. Furthermore, we found that there was a clear correlation between the PL enhancement and increase of the exciton binding energy. This important result suggests that carbon atoms doped in the silicide lattice may play as an isoelectronic trap and probably form bound excitons with stable states as predicted theoretically. We found a new mechanism of the PL enhancement for $$beta$$-FeSi$$_{2}$$ nanocrystals.

Journal Articles

Enhancement of IR light emission from $$beta$$-FeSi$$_{2}$$ nanocrystals embedded in Si

Maeda, Yoshihito; Nishimura, Kentaro*; Nakajima, Takahito*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji

Physica Status Solidi (C), 9(10-11), p.1888 - 1891, 2012/10

 Times Cited Count:3 Percentile:10.94

We have systematically investigated photoluminescence (PL) properties of $$beta$$-phase nanocrystals which are formed by a phase transition from metastable $$gamma$$-FeSi$$_{2}$$ with a Fluorite structure to $$beta$$-FeSi$$_{2}$$, and succeeded in enhancement of the PL intensity in the optimum conditions of double annealing process. For the PL enhancement, the time of postannealing at 800$$^{circ}$$C is dominated by the time of the preannealing at 400 or 500$$^{circ}$$C which is related to amount of the $$gamma$$-phase. After discussing some possible factors, we speculate that the PL enhancement observed in this study may be attributed mainly to improvement of the interface condition between the nanocrystal and Si, because the crystallographic epitaxial relationship among the phases, Si(111)//$$gamma$$(111)//$$beta$$(202)/(220) can be maintained during precipitation of the nanocrystal on Si(111).

Journal Articles

Magnetic and superconducting properties of CeRhGe$$_2$$ and CePtSi$$_2$$

Hirose, Yusuke*; Nishimura, Naoto*; Honda, Fuminori*; Sugiyama, Kiyohiro*; Hagiwara, Masayuki*; Kindo, Koichi*; Takeuchi, Tetsuya*; Yamamoto, Etsuji; Haga, Yoshinori; Matsuura, Masato*; et al.

Journal of the Physical Society of Japan, 80(2), p.024711_1 - 024711_12, 2011/02

 Times Cited Count:5 Percentile:57(Physics, Multidisciplinary)

Journal Articles

Development of a Rhenium-186-labeled MAG3-conjugated bisphosphonate for the palliation of metastatic bone pain based on the concept of bifunctional radiopharmaceuticals

Ogawa, Kazuma*; Mukai, Takahiro*; Arano, Yasushi*; Ono, Masahiro*; Hanaoka, Hirofumi*; Ishino, Seigo*; Hashimoto, Kazuyuki; Nishimura, Hiroshi*; Saji, Hideo*

Bioconjugate Chemistry, 16(4), p.751 - 757, 2005/07

 Times Cited Count:59 Percentile:11.82(Biochemical Research Methods)

Rhenium-186-1-hydroxyethylidene-1,1-diphosphonate ($$^{186}$$Re-HEDP) has been used for the palliation of metastatic bone pain. Delayed blood clearance and high gastric uptake of radioactivity have been observed upon injection, due to the instability of $$^{186}$$Re-HEDP in vivo. In this study, on the basis of the concept of bifunctional radiopharmaceuticals, we designed a stable $$^{186}$$Re-mercaptoacetylglycylglycylglycine (MAG3) complex-conjugated bisphosphonate ($$^{186}$$Re-MAG3-HBP). After purification by HPLC, $$^{186}$$Re-MAG3-HBP was synthesized with a radiochemical purity of over 95%. In biodistribution experiments, the radioactivity level of$$^{186}$$Re-MAG3-HBP in bone was significantly higher than that of $$^{186}$$Re-HEDP. Blood clearance of $$^{186}$$Re-MAG3-HBP was faster than that of $$^{186}$$Re-HEDP. In addition, the gastric accumulation of $$^{186}$$Re-MAG3-HBP radioactivity was lower than that of $$^{186}$$Re-HEDP. In conclusion, $$^{186}$$Re-MAG3-HBP is expected to be a useful radiopharmaceutical for the palliation of metastatic bone pain.

Journal Articles

Design of a radiopharmaceutical for the palliation of painful bone metastases; Rhenium-186-labeled bisphosphonate derivative

Ogawa, Kazuma*; Mukai, Takahiro*; Arano, Yasushi*; Hanaoka, Hirofumi*; Hashimoto, Kazuyuki; Nishimura, Hiroshi*; Saji, Hideo*

Journal of Labelled Compounds and Radiopharmaceuticals, 47(11), p.753 - 761, 2004/11

 Times Cited Count:27 Percentile:36.46(Biochemical Research Methods)

no abstracts in English

Oral presentation

Dependence of Mn content on interdiffusion behaviors at Fe$$_{2}$$MnSi/Ge(111) interfaces

Matsukura, Bui*; Nakajima, Takahito*; Nishimura, Kentaro*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito

no journal, , 

no abstracts in English

Oral presentation

Light emission from C$$_{60}$$ ion implanted $$beta$$-FeSi$$_{2}$$ with different crystal morphologies

Nakajima, Takahito*; Nishimura, Kentaro*; Matsukura, Bui*; Narumi, Kazumasa; Sakai, Seiji; Maeda, Yoshihito

no journal, , 

no abstracts in English

Oral presentation

Thermal stability of Fe$$_{2}$$MnSi/Ge(111) heteroepitaxial interfaces; Mn-concentration dependence

Maeda, Yoshihito; Nishimura, Kentaro*; Nagasawa, Yoshiyuki*; Narumi, Kazumasa; Sakai, Seiji

no journal, , 

no abstracts in English

Oral presentation

Effect of carbon implantation on photoluminescence of $$beta$$-FeSi$$_{2}$$ nanocrystals

Nishimura, Kentaro*; Nagasawa, Yoshiyuki*; Maeda, Yoshihito*; Narumi, Kazumasa

no journal, , 

no abstracts in English

Oral presentation

Growth of $$beta$$-FeSi$$_{2}$$ nanocrystals by phase transition and enhancement of light emission property

Nishimura, Kentaro*; Nakajima, Takahito*; Nagasawa, Yoshiyuki*; Narumi, Kazumasa; Maeda, Yoshihito*

no journal, , 

Oral presentation

Stabilizing and solidifications for Pu nitrate solution at TRP, 3; Preparation for the operation of solidification and stabilization for Pu nitrate solution and the operation result

Nishimura, Kazuaki; Tanaka, Hideki; Kobayashi, Daisuke; Suzuki, Shohei; Numata, Shinji; Nakamichi, Hideo; Kurita, Tsutomu; Iida, Masayoshi*; Tajiri, Kazuma*; Sukegawa, Katsumi*

no journal, , 

no abstracts in English

Oral presentation

Status of J-PARC E07

Yoshida, Junya; Ekawa, Hiroyuki; Hayakawa, Shuhei; Kasagi, Ayumi*; Nishimura, Shin*; Nyaw, A. N. L.*; Yoshimoto, Masahiro*; Nakazawa, Kazuma*

no journal, , 

J-PARC E07, an experiment with emulsion technique, is carrying out to detect 10 times higher statistics of double hypernuclei compared to the past experiments. This experiment aims to obtain quantitative data on baryon-baryon interaction, such as $$Lambda$$-$$Lambda$$ and $$Xi$$-nucleon interaction, by the mass measurement of various double hypernuclei. We completed beam exposure and photographic processing of the all emulsion modules as scheduled in 2018. In this presentation, the current status of the experiment, progress of analysis, the detection efficiency, and the schedule are introduced. As of Jan. 2019, we have scanned about 53% of 1300 emulsion sheets at least once. We have detected 22 candidate events of double hypernuclei.

15 (Records 1-15 displayed on this page)
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