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Journal Articles

Calculation of low-energy electron antineutrino spectra emitted from nuclear reactors with consideration of fuel burn-up

Riyana, E. S.*; Suda, Shoya*; Ishibashi, Kenji*; Matsuura, Hideaki*; Katakura, Junichi*; Sun, G. M.*; Katano, Yoshiaki

Journal of Nuclear Science and Technology, 56(5), p.369 - 375, 2019/05

https://doi.org/10.1080/00223131.2017.1291370

Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)

Nuclear reactors produce a great number of electron antineutrinos mainly from beta-decay chains of fission products. Such neutrinos have energies mostly in MeV range. We are interested in neutrinos in a region of keV, since they may have information on fuel burn-up and may be detected in future with advanced measurement technology. We calculate reactor antineutrino spectra especially in the low energy region. In this work we present neutrino spectra from various reactors such as typical PWR reactor and others types of reactors for comparison. Our result shows the electron antineutrino flux in the low energy region increases with burn-up of nuclear fuel by accumulated nuclides with low Q values in beta decay.

Journal Articles

Numerical and experimental study of H $^{-}$ beam dynamics in J-PARC LEBT

Shibata, Takanori*; Ikegami, Kiyoshi*; Liu, Y.*; Miura, Akihiko; Naito, Fujio*; Nammo, Kesao*; Oguri, Hidetomo; Okoshi, Kiyonori; Otani, Masashi*; Shinto, Katsuhiro; et al.

Proceedings of 29th International Linear Accelerator Conference (LINAC 2018) (Internet), p.519 - 521, 2019/01

https://doi.org/10.18429/JACoW-LINAC2018-TUPO079

Transport process of negative hydrogen ion (H $^{-}$ ) in LEBT (Low Energy Beam Transport) is investigated by comparison of experimental and numerical results. A three dimensional Particle-In-Cell (PIC) particle transport model has been developed in order to take into account (i) axial magnetic field by two solenoids in J-PARC LEBT and (ii) radial electric field by space charge (SC) effect. Ratio of H beam particles inside the RFQ (Radio Frequency Quadrupole) acceptance to the total particles at the RFQ entrance is calculated for different current conditions in LEBT solenoid 1 and 2. The results are compared with RFQ transmission rate measured in the J-PARC linac commissioning. The double peak of RFQ transmission rate to the solenoid applied current seen in the measurement is explained by the calculation results. The results indicate that presence of the LEBT orifice for differential pumping plays a role as a collimator to reduce emittance at RFQ entrance.

Journal Articles

A Significant role of non-thermal equilibrated electrons in the formation of deleterious complex DNA damage

Kai, Takeshi; Yokoya, Akinari*; Ukai, Masatoshi*; Fujii, Kentaro*; Toigawa, Tomohiro; Watanabe, Ritsuko*

Physical Chemistry Chemical Physics, 20(4), p.2838 - 2844, 2018/01

https://doi.org/10.1039/C7CP06903K

Times Cited Count：22 Percentile：76.35(Chemistry, Physical)

It is thought that complex DNA damage which induces in radiation biological effects is formed at radiation track end. Thus, the earliest stage of water radiolysis at the electron track end was studied to predict DNA damage. These results indicate that DNA damage sites comprising multiple nucleobase lesions with a single strand breaks can therefore be formed by multiple collisions of the electrons within three base pairs (3bp) of a DNA strand. This multiple damage site cannot be processed by base excision repair enzymes. However, pre-hydrated electrons can also be produced resulting in an additional base lesion more than 3bp away from the multi-damage site. This clustered damage site may be finally converted into a double strand break (DSB) when base excision enzymes process the additional base lesions. These DSBs include another base lesion(s) at their termini that escape from the base excision process and which may result in biological effects such as mutation in surviving cells.

Journal Articles

Charge-collection efficiency of single-crystal CVD diamond detector for low-energy charged particles with energies ranging from 100 keV to 2 MeV

Sato, Yuki; Murakami, Hiroyuki*; Shimaoka, Takehiro*; Tsubota, Masakatsu*; Kaneko, Junichi*

Nuclear Instruments and Methods in Physics Research A, 834, p.218 - 222, 2016/10

https://doi.org/10.1016/j.nima.2016.08.020

Times Cited Count：3 Percentile：28.09(Instruments & Instrumentation)

Journal Articles

Decomposition of 2-deoxy--ribose by irradiation with 0.6 keV electrons and by 0.5 keV ultrasoft X-rays

Fujii, Kentaro; Akamatsu, Ken; Yokoya, Akinari

International Journal of Radiation Biology, 80(11-12), p.909 - 914, 2004/11

https://doi.org/10.1080/09553000400017721

Times Cited Count：9 Percentile：52.57(Biology)

no abstracts in English

JAEA Reports

Proceedings of the FNCA 2003 Workshop on Application of Electron Accelerator; Radiation system for thin film, 18-22 August 2003, Kuala Lumpur, Malaysia

Yoshii, Fumio; Kume, Tamikazu

JAERI-Conf 2004-007, 216 Pages, 2004/06

JAERI-Conf-2004-007.pdf:16.15MB

no abstracts in English

JAEA Reports

Proceedings of the FNCA 2002 Workshop on Application of Electron Accelerator; Radiation System for Liquid Samples, 16-20 December 2002, JAERI, Takasaki, Japan

Yoshii, Fumio; Kume, Tamikazu

JAERI-Conf 2003-016, 185 Pages, 2003/10

JAERI-Conf-2003-016.pdf:14.49MB

no abstracts in English

Journal Articles

Low-energy - and X-ray measurements by means of Compton suppression technique for safeguards environmental samples

Yasuda, Kenichiro; Mori, Masahito*; Miyamoto, Yutaka; Magara, Masaaki; Sakurai, Satoshi; Usuda, Shigekazu

Journal of Nuclear Science and Technology, 39(Suppl.3), p.576 - 578, 2002/11

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875534

no abstracts in English

Journal Articles

Application of RI and radiation for industry low energy electron accelerator

Kume, Tamikazu

Genshiryoku eye, 48(6), P. 20, 2002/06

no abstracts in English

Journal Articles

Electron spectrra from singlet and triplet states of Ne $^{6+**}$ produced by low energy Ne $^{8+}$ +He, Ne and Ar collisions

Kitazawa, Shinichi; Ida, H.*; Matsui, Y.*; Takayanagi, Toshinobu*; Wakiya, K.*; Iemura, K.*; Otani, Shunsuke*; Suzuki, H.*; Kanai, Yasuyuki*; Safronova, U. I.*

Journal of Physics B; Atomic, Molecular and Optical Physics, 34(16), p.3205 - 3220, 2001/08

https://doi.org/10.1088/0953-4075/34/16/301

Times Cited Count：5 Percentile：31.37(Optics)

no abstracts in English

Journal Articles

Performance of soft X-ray emission spectrometer employing charge-coupled device detector

Sasaki, Teikichi; Chugan, Nobuhiko*; Muramatsu, Yasuji*

Nuclear Instruments and Methods in Physics Research A, 467-468(Part.2), p.1489 - 1492, 2001/07

https://doi.org/10.1016/S0168-9002(01)00732-X

Times Cited Count：3 Percentile：28.26(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Neutron inelastic scattering study of densified GeO $_{2}$ glass

Suzuya, Kentaro; Shibata, Kaoru*; Umesaki, Norimasa*; Kitamura, Naoyuki*; Kohara, Shinji*

Journal of the Physical Society of Japan, Vol.70, Supplement A, p.256 - 258, 2001/05

no abstracts in English

Journal Articles

Radiation effect of low energy electron beam on plant growth

Takeshita, Hidefumi; Pham, T. L. H.*; Yoshii, Fumio; Kume, Tamikazu

Shokuhin Shosha, 35(1-2), p.59 - 63, 2000/09

http://ci.nii.ac.jp/naid/10013022285

no abstracts in English

JAEA Reports

ComparaUve analyses on nuclear charaderistics of water-cooled breeder cores

; Sato, Wakaei*;

JNC TN9400 2000-037, 87 Pages, 2000/03

JNC-TN9400-2000-037.pdf:3.48MB

ln order to compare the nuclear characteristics of water-cooled bleeder cores with that of LMFBR, MOX fuel cell models are established for boiling and non-boiling LWR, non-boiling HWR and sodium-cooled reactor. Frst, the comarison is made between the heterogeneous cell calculation results by SRAC and those by SLAROM. The results show some differences as for neutron energy spectrum, one-grouped cross section and conversion ratio due to the different grouped cross section library (both are based on JENDL-3.2, though) used for each code, however, the difference is acceptably small for grasping the basic characteristics of the above-mentioned cores. Second, using the SLAROM code, main core parameters such as mean neutron energy, ratio of fast neutron and -value, are analyzed. The comparison between the cores show that softened neutron spectrum by the scattering effect of hydrogen or heavy hydrogen increase the contribution of nuclear reaction (especially for neutron capture reaction rather than fission reaction) in lower energy region comparing with LMFBR. ln order to overcome the effect, tighter lattice than LMFBR is necessary for water-cooled cores to realize the breeding of fissile nuclides. Third, effects of Pu isotopic composition on the breeding ratio are evaluated using SRAC burnup calculation. From the results, it is confirmed that degraded Pu (larger ratio of Pu-240) show the larger breeding ratio. At last, sensitivity analyses are made for k-effective and main reaction ratios. As for k-effective, using a temporary covariance data of JENDL-3.2, uncertainty resulting from the cross sections' error is analyzed for a boiling LWR and a sodium-cooled reactor. The boiling LWR core shows larger sensitivity in lower energy region than the sodium-cooled reactor (especially for the energy region lower than 1kev), And, 18-group analysis that is considered acceptably good for LMFBR analysis, should not be enough for accurate sensitivity estimation of ...