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Yasuda, Kenichiro; Miyamoto, Yutaka; Magara, Masaaki; Kimura, Takaumi
no journal, ,
no abstracts in English
Am-Li neutron sourceTsujimura, Norio; Yoshida, Tadayoshi
no journal, ,
no abstracts in English
Sr and 
Sr in effluent by a liquid scintilation counterNakano, Masanao; Hiyama, Yoshinori; Watanabe, Hitoshi; Sumiya, Shuichi; Takeishi, Minoru*
no journal, ,
no abstracts in English
Kawasaki, Masatsugu; Watanabe, Yoko; Shimizu, Rumi
no journal, ,
no abstracts in English
I in soil using an accelerator mass spectrometryKokubun, Yuji; Nakano, Masanao; Sumiya, Shuichi; Takeishi, Minoru*
no journal, ,
no abstracts in English
Hirose, Akira; Komeda, Masao; Kinase, Masami; Sorita, Takami; Sagawa, Hisashi; Wada, Shigeru
no journal, ,
no abstracts in English
Watanabe, Satoshi; Hashimoto, Kazuyuki; Watanabe, Shigeki; Iida, Yasuhiko*; Hanaoka, Hirofumi*; Endo, Keigo*; Ishioka, Noriko
no journal, ,
no abstracts in English
Watanabe, Shigeki; Hanaoka, Hirofumi*; Liang, J. X.; Iida, Yasuhiko*; Watanabe, Satoshi; Endo, Keigo*; Ishioka, Noriko
no journal, ,
no abstracts in English
Hirade, Tetsuya; Lee, J.
no journal, ,
Positronium (Ps) formed in water and OH radical are a geminate radical pair. The geminate radical pair is in a singlet state initially. Both of the spins are in different conditions and then the spin state changes between singlet and triplet. The rotational frequency of Ps is much faster than that of OH radical and a half has the same direction of the rotation and the other half have the opposite direction. The measured phenomenon is the mixture of the both cases and then there will be swells on the probability of the singlet state. The radical reaction of Ps and OH radical is affected by the spin state and then the swells of the spin state can be detected by the positron annihilation experiment as quantum beats. The quantum beats in water were successfully observed.
Hirade, Tetsuya; Lee, J.
no journal, ,
The quantum beats caused by the hyperfine coupling of OH radicals in water were observed by the time resolved positron annihilation 
-ray Doppler broadening measurements. There were two kinds of beats observed at 18
C and 25C. The hyperfine coupling constants of OH radicals are smaller at higher temperatures. These things indicate the two-state model of water structure. If there is a continuous state of water structure it should be impossible to measure the quantum beats. It is possible to say that there are two states of water structure and the structures are affected by temperatures.
Fukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko
no journal, ,
no abstracts in English
Yamashita, Shinichi; Maeyama, Takuya*; Baldacchino, G.*; Katsumura, Yosuke; Muroya, Yusa*; Taguchi, Mitsumasa; Kimura, Atsushi; Murakami, Takeshi*
no journal, ,
A novel sensitive method to determine OH yield in water radiolysis has been developed and has been applied for heavy-ion irradiations. In this work, this method was extended to measurement near the Bragg peak. It was found that OH yield has minimum value near the Bragg peak and is different even for the same ion irradiation of different acceleration energies.
Maeyama, Takuya*; Yamashita, Shinichi; Baldacchino, G.*; Katsumura, Yosuke; Muroya, Yusa*; Taguchi, Mitsumasa; Kimura, Atsushi; Murakami, Takeshi*
no journal, ,
OH yield near the Bragg peak of high-energy heavy ions, of which energies are comparable to those used in cancer therapy, has been determined in the previous work. Because fragmentations of primary projectile are significant in the energy region, it was purposed to calculate the fragmentations with an existing code and to reproduce the already obtained experimental results for verification of the code as well as for estimation of how much each fragmentated ions contributes in terms of OH yield.
Midorikawa, Masamichi*; Yamashita, Shinichi; Katsumura, Yosuke; Lin, M.; Muroya, Yusa*; Maeyama, Takuya*; Funtowiez, D.*; Kamibayashi, Masato*; Anzai, Kazunori*
no journal, ,
no abstracts in English
Tamoto, Yukihiro*; Sakamoto, Yuki*; Katsumura, Yosuke; Domae, Masafumi*; Akutagawa, Daisuke*; Ohira, Taku*; Hisamune, Kenji*
no journal, ,
no abstracts in English
Saiki, Seiichi; Nagasawa, Naotsugu; Hiroki, Akihiro; Morishita, Norio; Tamada, Masao; Kudo, Hisaaki*; Katsumura, Yosuke*
no journal, ,
no abstracts in English
Yamamoto, Hideaki
no journal, ,
no abstracts in English
Hanaya, Hiroaki; Seito, Hajime; Kaneko, Hirohisa; Haruyama, Yasuyuki; Kanazawa, Takao; Kojima, Takuji; Sunaga, Hiromi*
no journal, ,
no abstracts in English
Kawamura, Hiroshi
no journal, ,
no abstracts in English
value of hydroxyl radical at high temperatureMuroya, Yusa*; Takahashi, Hiroyuki*; Katsumura, Yosuke; Lin, M.; Kumagai, Yuta; Kudo, Hisaaki*
no journal, ,
Water coolant in light water cooled reactors is exposed to high-dose radioactive field, and oxidant products produced in water radiolysis are significant factor to induce and accelerate corrosion of constructional materials of the reactors. Therefore, it is inevitably important to figure out and to control water radiolysis and involved reactions at elevated temperatures. Especially, hydroxyl radical (
OH) is important species because of its the strongest oxidant property among water decomposition products. However, detailed properties and reactivity of the radical are not known well at the temperatures of 200 C or higher. In this work, reactivity of OH and p value for dissociative reaction between OH and O
have been evaluated up to 300 C with pulse radiolysis technique.