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100 MeV/nucleonPohl, T.*; Sun, Y. L.*; Obertelli, A.*; Lee, J.*; G
mez-Ramos, M.*; Ogata, Kazuyuki*; Yoshida, Kazuki; Cai, B. S.*; Yuan, C. X.*; Brown, B. A.*; et al.
Physical Review Letters, 130(17), p.172501_1 - 172501_8, 2023/04
Times Cited Count：5 Percentile：93.15(Physics, Multidisciplinary)We report on the first proton-induced single proton- and neutron-removal reactions from the neutron deficient 
O nucleus with large Fermi-surface asymmetry at 100 MeV/nucleon. Our results provide the first quantitative contributions of multiple reaction mechanisms including the quasifree knockout, inelastic scattering, and nucleon transfer processes. It is shown that the inelastic scattering and nucleon transfer, usually neglected at such energy regime, contribute about 50% and 30% to the loosely bound proton and deeply bound neutron removal, respectively.
)Komatsu, Kazuki*; Iwasaki, Tsugumi*; Murata, Kosuke*; Yamashiro, Hideaki*; Goh, V. S. T.*; Nakayama, Ryo*; Fujishima, Yohei*; Ono, Takumi*; Kino, Yasushi*; Shimizu, Yoshinaka*; et al.
Reproduction in Domestic Animals, 56(3), p.484 - 497, 2021/03
Times Cited Count：9 Percentile：86.02(Agriculture, Dairy & Animal Science)We have established an archive system of livestock and wild animals from the surrounding ex-evacuation zone. Wildlife within the alert zone have been exposed to low-dose-rate (LDR) radiation for a long and continuous time. In this study, we analysed the morphological characteristics of the testes and in vitro fertilization (IVF) capacity of cryopreserved sperm of raccoons from the ex-evacuation zone of the FDNPP accident. This study revealed that the chronic and LDR radiation exposure associated with the FDNPP accident had no adverse effect on the reproductive characteristics and functions of male raccoons.
anomalyKawakami, Yohei*; Harada, Masayasu*; Oka, Makoto; Suzuki, Kei
Physical Review D, 102(11), p.114004_1 - 114004_9, 2020/12
Times Cited Count：7 Percentile：46.51(Astronomy & Astrophysics)We study strong and radiative decays of excited singly heavy baryons using an effective chiral Lagrangian based on the diquark picture. The effective Lagrangian contains a anomaly term, which is found to suppress the decay width of 
.
Takahashi, Osamu*; Shibui, Yohei*; Xu, P. G.; Harjo, S.; Suzuki, Tetsuya*; Tomota, Yo*
Quantum Beam Science (Internet), 4(1), p.16_1 - 16_15, 2020/03
Noda, Yohei*; Koizumi, Satoshi*; Masui, Tomomi*; Mashita, Ryo*; Kishimoto, Hiromichi*; Yamaguchi, Daisuke; Kumada, Takayuki; Takata, Shinichi; Oishi, Kazuki*; Suzuki, Junichi*
Journal of Applied Crystallography, 49(6), p.2036 - 2045, 2016/12
Times Cited Count：19 Percentile：78.42(Chemistry, Multidisciplinary)
He neutron spin filters on the small-angle neutron scattering spectrometer SANS-J-IISakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Aizawa, Kazuya; Arai, Masatoshi; Noda, Yohei; et al.
Journal of Physics; Conference Series, 294(1), p.012017_1 - 012017_7, 2011/06
Times Cited Count：2 Percentile：65.41(Physics, Applied)Uchida, Yoshiaki*; Suzuki, Katsuaki*; Tamura, Rui*; Ikuma, Naohiko*; Shimono, Satoshi*; Noda, Yohei; Yamauchi, Jun*
Journal of the American Chemical Society, 132(28), p.9746 - 9752, 2010/06
Times Cited Count：51 Percentile：75.37(Chemistry, Multidisciplinary)An anisotropic and inhomogeneous magnetic interaction (the average spin-spin interaction constant, 
0) was observed in the various liquid crystalline (LC) phases of racemic and nonracemic all-organic radical LC compounds. We discussed how the LC superstructures induced the magnetic interaction to operate in the LC phases in terms of spin-spin dipole and exchange interactions by means of VT-EPR spectroscopy. The magnitude of the magnetic interaction depended on the type of LC phase, or the superstructure. Furthermore, these radical LC droplets floating on water were commonly attracted to a permanent magnet and moved freely under the influence of this magnet, whereas the crystallized particles of the same compounds never responded to the magnet. The response of the LC droplets to the magnet also varied depending on the type of LC phase, that is, the extent of the magnetic interaction.
Konomura, Mamoru; Ogawa, Takashi; Okano, Yasushi; Yamaguchi, Hiroyuki; Murakami, Tsutomu; Takaki, Naoyuki; Nishiguchi, Youhei; Sugino, Kazuteru; Naganuma, Masayuki; Hishida, Masahiko; et al.
JNC TN9400 2004-035, 2071 Pages, 2004/06
JNC-TN9400-2004-035.pdf:76.42MB
The attractive concepts for Sodium-, lead-bismuth-, helium- and water-cooled FBRs have been created through using typical plant features and employing advanced technologies. Efforts on evaluating technological prospects of feasibility have been paid for these concepts. Also, it was comfirmed if these concepts satisfy design requierments of capability and performance presumed in the feasibilty study on commertialization of Fast Breeder Reactor Systems. As results, it was concluded that the selection of sodium-cooled reactor was most rational for practical use of FBR technologies in 2015.
*; Murakami, Takashi*; Kogure, Toshihiro*; Isobe, Hiroshi; Sato, Tsutomu
Mat. Res. Soc. Symp. Proc., 506, p.839 - 846, 1998/00
no abstracts in English
-
and digital methodsHashi, Yohei; Hirade, Tetsuya; Suzuki, Takenori*
no journal, ,
Positron Annihilation Lifetime was measured by - coincidence method with a digital storage cscilloscope(DSO). A photodiode was used to detect the positron injected into a sample from a source. Two sets of a photomultiplier tube and a scintillator were used to detect annihilation rays emitting to opposite directions from the sample. This - coincidence lifetime measurement was first attempt and the signal-to-noise ratio became better than the conventional lifetime measurement by - coincidence method.
- positron annihilation lifetime measurement by use of digital oscilloscopeHirade, Tetsuya; Hashi, Yohei; Yachi, Hironari; Suzuki, Takenori*
no journal, ,
Recently, - positron annihilation lifetime measurement has been possible by use of Ge-68 positron emitter and avalanche photo diodes(APD). APD is placed between Ge-68 source and a sample and detecting positrons injecting into the sample. This information is used as a start signal and the stop signal is obtained by detecting one or both of the annihilation -rays. The detection rate of positrons is about 80% and then it is possible to reduce the random coincidence background. We have succeeded to reduce 40% of the background.
Yachi, Hironari; Hashi, Yohei; Hirade, Tetsuya; Suzuki, Takenori*
no journal, ,
Recently, it is becoming possible to apply digital oscilloscopes for positron annihilation lifetime measurement instead of use of analogue circuit (NIM modules). More than 1 million sets of wave signals from -ray detectors constructed by scintillaters and photomultiplier tubes are recorded by a digital oscilloscope and analyzed afterward by a personal computer. More than 1 million events of positron annihilation are accumulated on a multi channel analyzer (MCA) for 2-4 hours to construct one lifetime spectrum in the case of the conventional analogue lifetime measurement system. However, it is possible to measure 100 times longer time, i.e. to accumulate 100 times more counts, because of the much better stability of the positron annihilation lifetime measurement system by digital oscilloscopes. Although it is clear that the system by digital oscilloscopes is very stable, There is no indication how much it is stable and how we can construct stabler and better systems. We studied these things and can conclude that we should apply one electric power supply for all detectors and higher voltage to the detectors and full range measurement (8bit) can give better time resolution.
He neutron spin filters on small-angle neutron scattering spectrometer SANS-J-IISakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Arai, Masatoshi; Noda, Yohei; Koizumi, Satoshi; et al.
no journal, ,
no abstracts in English
He spin filters on small-angle neutron scattering spectrometer SANS-J-IISakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Aizawa, Kazuya; Arai, Masatoshi; Noda, Yohei; et al.
no journal, ,
no abstracts in English
Yamaguchi, Daisuke; Noda, Yohei; Koizumi, Satoshi; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*; Kodama, Hiroto*; Onuma, Masato*; Oba, Yojiro*
no journal, ,
The structure of nitrogen (N)-doped titanium dioxide (TiO
), which is a visible light photocatalyst, was investigated by small-angle neutron (SANS) and X-ray scattering (SAXS) methods. The bare TiO was fabricated by sol-gel method and possessed a characteristic length of ca. 10 nm due to some regularity consisting of TiO particles and pores. In the air, bare TiO and N-doped TiO specimens showed a similar scattering profiles each other for both of SANS and SAXS measurements. A slight increase of scattering intensity was observed for N-doped TiO specimen only on the SANS profile. To confirm whether the slight difference in SANS profiles between bare TiO2 and N-doped TiO specimens was due to the doped N atoms, both of bare TiO and N-doped TiO specimens were soaked in the mixture of HO/DO = 55/45 (w/w) mixture, of which scattering contrast for neutron is the same as TiO, and measured by SANS. The resultant SANS profiles of soaked bare TiO and N-doped TiO specimens were distinctly different each other and the scattering from doped N atoms, which gives the information of their distribution was captured.
Yamaguchi, Daisuke; Noda, Yohei; Koizumi, Satoshi; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*; Kodama, Hiroto*; Onuma, Masato*; Oba, Yojiro*; Yuasa, Takeshi*; et al.
no journal, ,
Nowadays industrial materials tend to include a variety of additives and to be a composite of them to satisfy a high request for intelligent function and durability. Elucidation of such a multi-component and hierarchical structure is really a tough work but indispensable to learn the fundamentals of relation between the structure and property and to attain a reasonable improvement of those materials. Combined use of small-angle neutron scattering (SANS) and small-angle X-ray scattering (SAXS) often gives a good clue to decompose the total scattering of the organic/inorganic composite into the partial scattering from a particular component. Two examples will be demonstrated here for extracting the structural information from the composite specimen via this method; one is the distribution of the dopant nitrogen atoms in the porous photocatalyst and the other is the dispersion state of fillers in the rubber matrix.
Yamaguchi, Daisuke; Hasegawa, Yoshio*; Hishinuma, Yukio*; Kodama, Hiroto*; Suzuki, Masashi*; Koizumi, Satoshi*; Noda, Yohei; Oba, Yojiro*
no journal, ,
Anion doped titanium dioxide (TiO), which is expected to exhibit an improved photo-catalytic property due to the effect of narrowing in the band gap, was investigated by small-angle neutron scattering (SANS). Among wide variety of photo-catalytic products, TiO is one of the most promising and various improvements have been done. On the functional aspect it has been confirmed that for instance, nitrogen (N) doped TiO can be activated not only by the photons of which wavelength is corresponding to ultraviolet but also by those of visible light and thereby an enhancement of the efficiency is attained. However, the difference in structure between bare TiO and N-doped TiO has not yet definitively clarified despite the considerable structural analyses by using X-ray probes. With profiting from an enhanced scattering length of N atoms to the neutron beam, an attempt to capture the distribution of N atoms in the N-doped TiO by SANS is presented here.
Noda, Yohei; Yamaguchi, Daisuke; Shamoto, Shinichi; Hashimoto, Takeji; Kumada, Takayuki; Takata, Shinichi; Koizumi, Satoshi; Oishi, Kazuki*; Suzuki, Junichi*; Masui, Tomomi*; et al.
no journal, ,
We have developed proton spin polarization technique for contrast variation in small angle neutron scattering (SANS), which utilizes that neutron scattering section can be controlled by polarizing proton spins. Consequently, we succeeded in the analysis of nano-structure in multi-component samples. We will report the detail of our recent activity for getting higher proton spin oplarization. The recent results of SANS measurement with proton spin polarization conducted for the first time at TAIKAN in J-PARC will also be reported.
Noda, Yohei; Yamaguchi, Daisuke; Shamoto, Shinichi; Hashimoto, Takeji; Kumada, Takayuki; Takata, Shinichi; Koizumi, Satoshi*; Oishi, Kazuki*; Suzuki, Junichi*; Masui, Tomomi*; et al.
no journal, ,
Neutron scattering length changes as aligning the spin direction of protons in a sample. By use of this phenomenon, we have developed spin contrast variation technique for studying nano-scale structure formed in multi-component systems. In this presentation, we report the results of our recent experiment at J-PARC TAIKAN.
Yamaguchi, Daisuke; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*; Kodama, Hiroto*; Koizumi, Satoshi*; Noda, Yohei; Oba, Yojiro*
no journal, ,
Anion, e.g., nitrogen (N) doped titanium dioxide (TiO), being expected to exhibit an improved photo-catalytic property due to the effect of narrowing in the band gap, was investigated by small- (SANS) and wide-angle neutron scattering. Among wide variety of photo-catalytic products, TiO is one of the most promising and various improvements have been done. However, the difference in structure between bare TiO and N-doped TiO has not yet definitively clarified despite the considerable structural analyses by X-ray diffraction or X-ray photoemission spectroscopy. With profiting from an enhanced scattering length of N atoms to the neutron beam, an attempt to capture the distribution of N atoms in N-doped TiO by SANS was conducted. Specimens prepared with and without N-doping were compared. The traces of doped N species on the scattering profiles might be brought out from invisible differences with contrast variation method employing the soakage in tuned HO/DO mixture possessing nearly the same scattering length density as TiO component.
