Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Tsunoda, Naofumi*; Otsuka, Takaharu; Takayanagi, Kazuo*; Shimizu, Noritaka*; Suzuki, Toshio*; Utsuno, Yutaka; Yoshida, Sota*; Ueno, Hideki*
Nature, 587, p.66 - 71, 2020/11
Times Cited Count：42 Percentile：93.04(Multidisciplinary Sciences)no abstracts in English
Otsuka, Takaharu*; Gade, A.*; Sorlin, O.*; Suzuki, Toshio*; Utsuno, Yutaka
Reviews of Modern Physics, 92(1), p.015002_1 - 015002_52, 2020/03
Times Cited Count：201 Percentile：96.52(Physics, Multidisciplinary)no abstracts in English
Ni hole-states from (p,d) transfer reactionsSanetullaev, A.*; Tsang, M. B.*; Lynch, W. G.*; Lee, J.*; Bazin, D.*; Chan, K. P.*; Coupland, D.*; Hanzl, V.*; Hanzlova, D.*; Kilburn, M.*; et al.
Physics Letters B, 736, p.137 - 141, 2014/09
Times Cited Count：15 Percentile：69.48(Astronomy & Astrophysics)no abstracts in English
Suzuki, Toshio*; Yoshida, Takashi*; Chiba, Satoshi; Kajino, Toshitaka*
Nihon Butsuri Gakkai-Shi, 67(1), p.49 - 54, 2012/01
Neutrino processes play important roles in synthesis of 
Li, 
B, 
La, 
Ta and other elements in explosive environments realized in supernovae. In order to understand better the neutrino processes, we constructed new shell model Hamiltonians based on recent progress of physics in unstable nuclei near the neutron drip-line. We then applied these Hamiltonians to calculate the neutrino-nucleus reaction cross sections through detailed and careful comparison of nuclear properties with those of relevant experimental data. We can thus carry out precise and reliable theoretical estimate of supernova nucleosynthesis of 
Li, B, etc including the neutrino processes. Finally we propose a new method to determine unknown neutrino oscillation parameters, namely the mixing angle 
and the mass hierarchy, by making use of strong dependence of the yields of Li, B on these parameters.
Suzuki, Toshio*; Yoshida, Takashi*; Chiba, Satoshi; Kajino, Toshitaka*
Nihon Butsuri Gakkai-Shi, 67(1), p.49 - 54, 2012/01
Neutrino-nucleus reaction processes play important roles in synthesis of Li, B, La, Ta and other elements in explosive environments realized in supernovae. We have constructed new shell model Hamiltonians based on recent progress of physics in unstable nuclei near the neutron drip-line. The spin responses of nuclei are found to be remarkably improved by the new Hamiltonians. We then applied these Hamiltonians to calculate the neutrino-nucleus reaction cross sections, and obtained more precise and reliable theoretical estimate of supernova nucleosynthesis of Li, B, etc including the neutrino processes. Finally we propose a new method to determine unknown neutrino oscillation parameters, namely the mixing angle and the mass hierarchy, by making use of strong dependence of the yields of Li and B on these parameters.
Shibuta, Yasushi*; Unoura, Seiji*; Sato, Takumi; Shibata, Hiroki; Kurata, Masaki*; Suzuki, Toshio*
Journal of Nuclear Materials, 414(2), p.114 - 119, 2011/07
Times Cited Count：16 Percentile：75.56(Materials Science, Multidisciplinary)The uranium dendrite growth on cathode during pyroprocessing of uranium is investigated using a novel phase-field model, in which electrodeposition of uranium and zirconium from molten-salt is taken into account. The threshold concentration of zirconium in molten salt demarcating the dendritic and planar growth is then estimated as a function of the current density. Moreover, growth process of both the dendritic and planar electrodeposits has been demonstrated by way of varying the mobility of the phase field, which consists of the effect of attachment kinetics and diffusion.
Otsuka, Takaharu*; Suzuki, Toshio*; Homma, Michio*; Utsuno, Yutaka; Tsunoda, Naofumi*; Tsukiyama, Koshiro*; Hjorth-Jensen, M.*
Physical Review Letters, 104(1), p.012501_1 - 012501_4, 2010/01
Times Cited Count：361 Percentile：98.93(Physics, Multidisciplinary)no abstracts in English
Yoshida, Takashi*; Suzuki, Toshio*; Chiba, Satoshi; Kajino, Toshitaka*; Yokomakura, Hidekazu*; Kimura, Keiichi*; Takamura, Akira*; Hartmann, D.*
Astrophysical Journal, 686(1), p.448 - 466, 2008/10
The neutrino-nucleus reaction cross sections of 
He and 
C are evaluated using new shell model Hamiltonians. Branching ratios of various decay channels are calculated to evaluate the yields of Li, Be, and B produced through the 
-process in supernova explosions. The new cross sections enhance the yields of Li and B produced during the supernova explosion of a 16.2 M
star model compared to our previous study by factors of 1.3 and 1.2, respectively. On the other hand, the yield of 
B decreases by a factor of three. The yields of 
Li, 
Be, and the radioactive nucleus Be are found at a level of 10 to 11 M. The temperature of 
- and 
-neutrinos inferred from the supernova contribution of B in Galactic chemical evolution models is constrained to be in the range 4.5 MeV to 6.4 MeV. The increase in the Li and B yields due to neutrino oscillations is demonstrated with the new cross sections.
Yoshida, Takashi*; Suzuki, Toshio*; Chiba, Satoshi; Kajino, Toshitaka*; Yokomakura, Hidekazu*; Kimura, Keiichi*; Takamura, Akira*; Hartmann, D. H.*
Astrophysical Journal, 686(1), p.448 - 466, 2008/10
Times Cited Count：92 Percentile：89.48(Astronomy & Astrophysics)The neutrino-nucleus reaction cross sections of He and C are evaluated using new shell model Hamiltonians. The new cross sections enhance the yields of Li and B produced during the supernova explosion of a 16.2 
star model compared to the case using the conventional cross sections by about 10%. On the other hand, the yield of B decreases by a factor of two. The yields of 
Li, 
Be, and the radioactive nucleus Be are found at a level of 
. The temperature of 
- and 
-neutrinos inferred from the supernova contribution of B in Galactic chemical evolution models is constrained to be in the range 4.3 MeV to 6.5 MeV. The increase in the Li and B yields due to neutrino oscillations is demonstrated with the new cross sections.
Otsuka, Takaharu*; Suzuki, Toshio*; Utsuno, Yutaka
Nuclear Physics A, 805(1-4), p.127c - 136c, 2008/06
Times Cited Count：36 Percentile：85.83(Physics, Nuclear)no abstracts in English
Suzuki, Toshio*; Chiba, Satoshi; Yoshida, Takashi*; Higashijima, Koji*; Homma, Michio*; Kajino, Toshitaka*; Otsuka, Takaharu*
Nuclear Physics A, 805(2), p.579 - 581, 2008/02
Neutrino-nucleus reactions on C and He are studied based on new shell model Hamiltonians. The cross sections are found to be enhanced compared with those obtained by conventional Hamiltonians. The production yield of Li and B during supernova explosions are pointed out to be enhanced, and a possibility of determining the neutrino mixing angle is discussed in case of neutrino oscillations. Neutrino induced reactions on Fe and Ni isotopes are also studied based on recent advances in shell model calculations in the 
-shell. The reaction crowds sections are found to be enhanced compared with those obtained by a modified KB3 Hamiltonian.
Hirade, Tetsuya; Suzuki, Naoki*; Saito, Fuminori*; Hyodo, Toshio*
Physica Status Solidi (C), 4(10), p.3714 - 3717, 2007/09
Times Cited Count：6 Percentile：82.36(Physics, Atomic, Molecular & Chemical)Positronium (Ps) can be formed by a reaction of trapped electrons and free positrons at low temperatures in molecular solids. While Ps formation by Ore and spur process must be fast, Ps formation by trapped electrons and free positrons is possible even at later positron age. The evidence of this delayed Ps formation was obtained by age-momentum correlation measurement of electron-positron pair annihilation 
-rays. In this work the 
parameter curves measured with trapped electrons and no trapped electrons in polyethylene are interpreted by introducing possible positron reactions. Positrons that escape from Ps formation by the Ore and the spur processes have chance to form Ps with trapped electrons. This Ps formation competes with the positron localization resulting from the trapping between molecules or the weakly binding on molecules, ions, or radicals. Assuming the possibility of both the delayed Ps formation and delayed positron trapping and that S-parameters for ortho-Ps and free positrons are the same, we obtain a good fit to the observed time dependent S-parameter curves .
Suzuki, Toshio*; Chiba, Satoshi; Yoshida, Takashi*; Kajino, Toshitaka*; Otsuka, Takaharu*
Physical Review C, 74(3), p.034307_1 - 034307_9, 2006/09
Times Cited Count：103 Percentile：97.16(Physics, Nuclear)no abstracts in English
Suzuki, Toshio*; Chiba, Satoshi; Iwamoto, Osamu; Kajino, Toshitaka*
AIP Conference Proceedings 847, p.479 - 481, 2006/07
no abstracts in English
Suzuki, Naoki*; Hirade, Tetsuya; Saito, Fuminori*; Hyodo, Toshio*
Radiation Physics and Chemistry, 68(3-4), p.647 - 649, 2003/10
Times Cited Count：23 Percentile：80.59(Chemistry, Physical)no abstracts in English
Yanagisawa, Kazuaki; Katanishi, Shoji; *; Sasajima, Hideo; ; Horiki, Oichiro; Mimura, Hideaki; ; ; ; et al.
JAERI-M 92-015, 211 Pages, 1992/02
no abstracts in English
Inabe, Teruo; Ishijima, Kiyomi; Tanzawa, Sadamitsu; Shimazaki, Junya; Nakamura, Takehiko; ; ; ; ; ; et al.
JAERI-M 88-113, 55 Pages, 1988/06
no abstracts in English
; ;
Nihon Genshiryoku Gakkai-Shi, 17(10), p.554 - 558, 1975/10
no abstracts in English
Hirade, Tetsuya; Suzuki, Naoki*; Saito, Fuminori*; Hyodo, Toshio*
no journal, ,
The electrons formed by ionization can be localized with 0.5-3eV at low temperatures (below -50
C) in some materials for long time. Positrons injected in liquids and molecular solids have a chance to form positronium with one of the excess electrons in the spur. However some of the positrons can escape from the positronium formation and they will annihilates from free positron state, usually. If there are weakly localized electrons in the materials at low temperatures, positrons will have the next chance to form positronium with these electrons. We showed that this positornium formation was slower than the positoronium formation in the spur. We have analyzed the data with considering the positron localization time and obtained several 10 ps as the localization time of positrons in polyethylene at 20K.
Wada, Ken*; Hyodo, Toshio*; Yagishita, Akira*; Ikeda, Mitsuo*; Osawa, Satoshi*; Shidara, Tetsuo*; Michishio, Koji*; Suzuki, Ryohei*; Tachibana, Takayuki*; Nagashima, Yasuyuki*; et al.
no journal, ,
no abstracts in English
