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99 results on '"Kikunaga, Hidetoshi"'

6. Co-precipitation behaviour of single atoms of rutherfordium in basic solutions

Author

Kasamatsu, Yoshitaka, Toyomura, Keigo, Haba, Hiromitsu, Yokokita, Takuya, Shigekawa, Yudai, Kino, Aiko, Yasuda, Yuki, Komori, Yukiko, Kanaya, Jumpei, Huang, Minghui, Murakami, Masashi, Kikunaga, Hidetoshi, Watanabe, Eisuke, Yoshimura, Takashi, Morita, Kosuke, Mitsugashira, Toshiaki, Takamiya, Koichi, Ohtsuki, Tsutomu, and Shinohara, Atsushi

Published
2021
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9. New Result in the Production and Decay of an Isotope, 278[113], of the 113th Element

Author

Morita, Kosuke, Morimoto, Kouji, Kaji, Daiya, Haba, Hiromitsu, Ozeki, Kazutaka, Kudou, Yuki, Sumita, Takayuki, Wakabayashi, Yasuo, Yoneda, Akira, Tanaka, Kengo, Yamaki, Sayaka, Sakai, Ryutaro, Akiyama, Takahiro, Goto, Shin-ichi, Hasebe, Hiroo, Huang, Minghui, Huang, Tianheng, Ideguchi, Eiji, Kasamatsu, Yoshitaka, Katori, Kenji, Kariya, Yoshiki, Kikunaga, Hidetoshi, Koura, Hiroyuki, Kudo, Hisaaki, Mashiko, Akihiro, Mayama, Keita, Mitsuoka, Shin-ichi, Moriya, Toru, Murakami, Masashi, Murayama, Hirohumi, Namai, Saori, Ozawa, Akira, Sato, Nozomi, Sueki, Keisuke, Takeyama, Mirei, Tokanai, Fuyuki, Yamaguchi, Takayuki, and Yoshida, Atsushi

Subjects
Nuclear Experiment
Abstract

An isotope of the 113th element, i.e., 278[113], was produced in a nuclear reaction with a 70Zn beam on a 209Bi target. We observed six consecutive {\alpha}-decays following the implantation of a heavy particle in nearly the same position in the semiconductor detector under an extremely low background condition. The fifth and sixth decays are fully consistent with the sequential decays of 262Db and 258Lr in both decay energies and decay times. This indicates that the present decay chain consisted of 278[113], 274Rg (Z=111), 270Mt (Z=109), 266Bh (Z=107), 262Db (Z=105), and 258Lr (Z=103) with firm connections. This result, together with previously reported results from 2004 and 2007, conclusively leads to the unambiguous production and identification of the isotope 278[113] of the 113th element., Comment: http://jpsj.ipap.jp/link?JPSJ/81/103201/

Published
2012
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10. Laser spectroscopy of triply charged 229Th isomer for a nuclear clock.

Author

Yamaguchi, Atsushi, Shigekawa, Yudai, Haba, Hiromitsu, Kikunaga, Hidetoshi, Shirasaki, Kenji, Wada, Michiharu, and Katori, Hidetoshi

Abstract

Thorium-229 (229Th) possesses an optical nuclear transition between the ground state (229gTh) and low-lying isomer (229mTh). A nuclear clock based on this nuclear-transition frequency is expected to surpass existing atomic clocks owing to its insusceptibility to surrounding fields1–5. In contrast to other charge states, triply charged 229Th (229Th3+) is the most suitable for highly accurate nuclear clocks because it has closed electronic transitions that enable laser cooling, laser-induced fluorescence detection and state preparation of ions1,6–8. Although laser spectroscopic studies of 229Th3+ in the nuclear ground state have been performed8, properties of 229mTh3+, including its nuclear decay lifetime that is essential to specify the intrinsic linewidth of the nuclear-clock transition, remain unknown. Here we report the trapping of 229mTh3+ continuously supplied by a 233U source and the determination of nuclear decay half-life of the isolated 229mTh3+ to be 1,400 − 300 + 600 s through nuclear-state-selective laser spectroscopy. Furthermore, by determining the hyperfine constants of 229mTh3+, we reduced the uncertainty of the sensitivity of the 229Th nuclear clock to variations in the fine-structure constant by a factor of four. These results offer key parameters for the 229Th3+ nuclear clock and its applications in the search for new physics.The trapping of triply charged 229mTh3+ is described and its nuclear decay half-life determined, showing useful properties for the development of a nuclear clock and applications in the search for new physics. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Comparison of Nuclear Medicine Therapeutics Targeting PSMA among Alpha-Emitting Nuclides.

Author

Kaneda-Nakashima, Kazuko, Shirakami, Yoshifumi, Kadonaga, Yuichiro, Watabe, Tadashi, Ooe, Kazuhiro, Yin, Xiaojie, Haba, Hiromitsu, Shirasaki, Kenji, Kikunaga, Hidetoshi, Tsukada, Kazuaki, Toyoshima, Atsushi, Cardinale, Jens, Giesel, Frederik L., and Fukase, Koichi

Subjects
NUCLIDES, NUCLEAR medicine, CANCER cells, DRUG administration
Abstract

Currently, targeted alpha therapy (TAT) is a new therapy involving the administration of a therapeutic drug that combines a substance of α-emitting nuclides that kill cancer cells and a drug that selectively accumulates in cancer cells. It is known to be effective against cancers that are difficult to treat with existing methods, such as cancer cells that are widely spread throughout the whole body, and there are high expectations for its early clinical implementation. The nuclides for TAT, including 149Tb, 211At, 212/213Bi, 212Pb (for 212Bi), 223Ra, 225Ac, 226/227Th, and 230U, are known. However, some nuclides encounter problems with labeling methods and lack sufficient preclinical and clinical data. We labeled the compounds targeting prostate specific membrane antigen (PSMA) with 211At and 225Ac. PSMA is a molecule that has attracted attention as a theranostic target for prostate cancer, and several targeted radioligands have already shown therapeutic effects in patients. The results showed that 211At, which has a much shorter half-life, is no less cytotoxic than 225Ac. In 211At labeling, our group has also developed an original method (Shirakami Reaction). We have succeeded in obtaining a highly purified labeled product in a short timeframe using this method. [ABSTRACT FROM AUTHOR]

Published
2024
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12. The HKT1 Na + transporter protects plant fertility by decreasing Na + content in stamen filaments

Author

Uchiyama, Takeshi, primary, Saito, Shunya, additional, Yamanashi, Taro, additional, Kato, Megumi, additional, Takebayashi, Kosuke, additional, Hamamoto, Shin, additional, Tsujii, Masaru, additional, Takagi, Tomoko, additional, Nagata, Noriko, additional, Ikeda, Hayato, additional, Kikunaga, Hidetoshi, additional, Suda, Toshimi, additional, Toyama, Sho, additional, Miwa, Misako, additional, Matsuyama, Shigeo, additional, Seo, Mitsunori, additional, Horie, Tomoaki, additional, Kuromori, Takashi, additional, Yamagami, Mutsumi, additional, Ishimaru, Yasuhiro, additional, and Uozumi, Nobuyuki, additional

Published
2023
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36. Dispersion of Alpha-Nuclides during Animal Experiments

Author

KANEDA-NAKASHIMA, Kazuko, primary, ZHANG, Zijian, additional, NAGATA, Kojiro, additional, SHIRASAKI, Kenji, additional, KIKUNAGA, Hidetoshi, additional, YAMAMURA, Tomoo, additional, OOE, Kazuhiro, additional, WATABE, Tadashi, additional, TOYOSHIMA, Atsushi, additional, YOSHIMURA, Takashi, additional, and SHINOHARA, Atsushi, additional

Published
2021
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42. Extraction behavior of rutherfordium as a cationic fluoride complex with a TTA chelate extractant from HF/HNO3 acidic solutions.

Author

Yokoyama, Akihiko, Kitayama, Yuta, Fukuda, Yoshiki, Kikunaga, Hidetoshi, Murakami, Masashi, Komori, Yukiko, Yano, Shinya, Haba, Hiromitsu, Tsukada, Kazuaki, and Toyoshima, Atsushi

Subjects
RUTHERFORDIUM, CHELATES, STATIONARY phase (Chromatography), CHROMATOGRAPHIC analysis, ADSORPTION (Chemistry)
Abstract

The aim of this study was to identify relevant Rf chemical species by using reversed-phase extraction chromatography with 2-thenoyltrifluoroacetone (TTA) resin as the stationary phase. Because TTA can be used to extract specific metal ions, the distribution ratios of the system enabled determination of the specific complex formation constant of Rf. We performed several experiments on chemical systems with Zr, Hf, No, and Rf, determined their adsorption coefficients, and deduced the Kd values for Rf. [ABSTRACT FROM AUTHOR]

Published
2019
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44. Observation of α-decay of ^<229m>Th produced from ^<229>Ac(II. Radiochemistry)

Author

Kikunaga, Hidetoshi, Kasamatsu, Yoshitaka, Takamiya, Koichi, Mitsugashira, Toshiaki, Hara, Mitsuo, Ohtsuki, Tsutomu, Yuki, Hideyuki, Shinohara, Atsushi, Shibata, Seiichi, Kinoshita, Norikazu, Yokoyama, Akihiko, and Nakanishi, Takashi

Abstract

We produced ^Th in the nuclear reaction ^Th(γ, p2n)^ Ac, followed by disintegration to ^Th. The α-decay signals from ^Th were searched for and the alpha-particle events of the energy region between 4.93MeV and 5.05MeV were observed in the separated thorium fraction from an actinium source highly purified from the ^Th+γ reaction products. The energy values of the α-particles coincide with those expected for ^Th.

Published
2005

45. Performance of New Gas-Filled Recoil Ion Separator GARIS-II for Asymmetric Fusion Reaction

Author

Kaji, Daiya, primary, Morimoto, Kouji, additional, Wakabayashi, Yasuo, additional, Takeyama, Mirei, additional, Yamaki, Sayaka, additional, Tanaka, Kengo, additional, Haba, Hiromitsu, additional, Huang, M, additional, Murakami, Masashi, additional, Kanaya, Junpei, additional, Ito, Yuta, additional, Kikunaga, Hidetoshi, additional, Tokanai, Fuyuki, additional, Goto, Shin-ichi, additional, Asai, Masato, additional, and Morita, Kosuke, additional

Published
2015
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46. Extraction behavior of rutherfordium as a cationic fluoride complex with a TTA chelate extractant from HF/HNO3acidic solutions

Author

Yokoyama, Akihiko, Kitayama, Yuta, Fukuda, Yoshiki, Kikunaga, Hidetoshi, Murakami, Masashi, Komori, Yukiko, Yano, Shinya, Haba, Hiromitsu, Tsukada, Kazuaki, and Toyoshima, Atsushi

Abstract

The aim of this study was to identify relevant Rf chemical species by using reversed-phase extraction chromatography with 2-thenoyltrifluoroacetone (TTA) resin as the stationary phase. Because TTA can be used to extract specific metal ions, the distribution ratios of the system enabled determination of the specific complex formation constant of Rf. We performed several experiments on chemical systems with Zr, Hf, No, and Rf, determined their adsorption coefficients, and deduced the Kdvalues for Rf.

Published
2018
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47. New Result on the Production of277Cn by the208Pb +70Zn Reaction

Author

Sumita, Takayuki, primary, Morimoto, Kouji, additional, Kaji, Daiya, additional, Haba, Hiromitsu, additional, Ozeki, Kazutaka, additional, Sakai, Ryutaro, additional, Yoneda, Akira, additional, Yoshida, Atsushi, additional, Hasebe, Hiroo, additional, Katori, Kenji, additional, Sato, Nozomi, additional, Wakabayashi, Yasuo, additional, Mitsuoka, Shin-ichi, additional, Goto, Shin-ichi, additional, Murakami, Masashi, additional, Kariya, Yoshiki, additional, Tokanai, Fuyuki, additional, Mayama, Keita, additional, Takeyama, Mirei, additional, Moriya, Toru, additional, Ideguchi, Eiji, additional, Yamaguchi, Takayuki, additional, Kikunaga, Hidetoshi, additional, Chiba, Junsei, additional, and Morita, Kosuke, additional

Published
2013
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48. New Result in the Production and Decay of an Isotope,278113, of the 113th Element

Author

Morita, Kosuke, primary, Morimoto, Kouji, additional, Kaji, Daiya, additional, Haba, Hiromitsu, additional, Ozeki, Kazutaka, additional, Kudou, Yuki, additional, Sumita, Takayuki, additional, Wakabayashi, Yasuo, additional, Yoneda, Akira, additional, Tanaka, Kengo, additional, Yamaki, Sayaka, additional, Sakai, Ryutaro, additional, Akiyama, Takahiro, additional, Goto, Shin-ichi, additional, Hasebe, Hiroo, additional, Huang, Minghui, additional, Huang, Tianheng, additional, Ideguchi, Eiji, additional, Kasamatsu, Yoshitaka, additional, Katori, Kenji, additional, Kariya, Yoshiki, additional, Kikunaga, Hidetoshi, additional, Koura, Hiroyuki, additional, Kudo, Hisaaki, additional, Mashiko, Akihiro, additional, Mayama, Keita, additional, Mitsuoka, Shin-ichi, additional, Moriya, Toru, additional, Murakami, Masashi, additional, Murayama, Hirohumi, additional, Namai, Saori, additional, Ozawa, Akira, additional, Sato, Nozomi, additional, Sueki, Keisuke, additional, Takeyama, Mirei, additional, Tokanai, Fuyuki, additional, Yamaguchi, Takayuki, additional, and Yoshida, Atsushi, additional

Published
2012
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49. Superheavy Element Nuclear Chemistry at RIKEN

Author

Haba, Hiromitsu, primary, Kaji, Daiya, additional, Kasamatsu, Yoshitaka, additional, Kikunaga, Hidetoshi, additional, Komori, Yukiko, additional, Kudou, Yuki, additional, Morimoto, Kouji, additional, Morita, Kosuke, additional, Ooe, Kazuhiro, additional, Ozeki, Kazutaka, additional, Sato, Nozomi, additional, Shinohara, Atsushi, additional, Toyoshima, Atsushi, additional, Yokoyama, Akihiko, additional, Yoneda, Akira, additional, Yoshimura, Takashi, additional, Ozawa, Akira, additional, and Lu, Weiping, additional

Published
2010
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50. Anionic Fluoro Complex of Element 105, Db

Author

Kasamatsu, Yoshitaka, primary, Toyoshima, Atsushi, additional, Asai, Masato, additional, Tsukada, Kazuaki, additional, Li, Zijie, additional, Ishii, Yasuo, additional, Toume, Hayato, additional, Sato, Tetsuya K., additional, Kikuchi, Takahiro, additional, Nishinaka, Ichiro, additional, Nagame, Yuichiro, additional, Haba, Hiromitsu, additional, Kikunaga, Hidetoshi, additional, Kudou, Yuki, additional, Oura, Yasuji, additional, Akiyama, Kazuhiko, additional, Sato, Wataru, additional, Ooe, Kazuhiro, additional, Fujisawa, Hiroyuki, additional, Shinohara, Atsushi, additional, Goto, Shin-ichi, additional, Hasegawa, Taichi, additional, Kudo, Hisaaki, additional, Nanri, Tomohiro, additional, Araki, Mikio, additional, Kinoshita, Norikazu, additional, Yokoyama, Akihiko, additional, Fan, Fangli, additional, Qin, Zhi, additional, Düllmann, Christoph E., additional, Schädel, Matthias, additional, and Kratz, Jens V., additional

Published
2009
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