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Journal Articles

Two-step Mott transition in Ni(S,Se)$$_2$$; $$mu$$SR studies and charge-spin percolation model

Sheng, Q.*; Kaneko, Tatsuya*; Yamakawa, Kohtaro*; Guguchia, Z.*; Gong, Z.*; Zhao, G.*; Dai, G.*; Jin, C.*; Guo, S.*; Fu, L.*; et al.

Physical Review Research (Internet), 4(3), p.033172_1 - 033172_14, 2022/09

https://doi.org/10.1103/PhysRevResearch.4.033172

Journal Articles

Magnetic-field and composition tuned antiferromagnetic instability in the quantum spin-liquid candidate NaYbO$$_2$$

Guo, J.*; Zhao, X.*; Kawamura, Seiko; Ling, L.*; Wang, J.*; He, L.*; Nakajima, Kenji; Li, B.*; Zhang, Z.*

Physical Review Materials (Internet), 4(6), p.064410_1 - 064410_7, 2020/06

https://doi.org/10.1103/PhysRevMaterials.4.064410
 Times Cited Count：27 Percentile：62.83(Materials Science, Multidisciplinary)

Journal Articles

Effects of the nuclear structure of fission fragments on the high-energy prompt fission $$gamma$$-ray spectrum in $$^{235}$$U($$n_{rm th},f$$)

Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; L$'e$guillon, R.; Ogawa, Tatsuhiko; Soldner, T.*; K$"o$ster, U.*; Pollitt, A.*; Hambsch, F.-J.*; et al.

Physical Review C, 100(4), p.044610_1 - 044610_7, 2019/10

https://doi.org/10.1103/PhysRevC.100.044610
 Times Cited Count：18 Percentile：76.52(Physics, Nuclear)

Journal Articles

A New detector system for the measurement of high-energy prompt $$gamma$$-rays for low-energy neutron induced fission

Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; L$'e$guillon, R.*; Ogawa, Tatsuhiko; Soldner, T.*; Hambsch, F.-J.*; A$"i$che, M.*; Astier, A.*; et al.

Nuclear Instruments and Methods in Physics Research A, 906, p.88 - 96, 2018/10

https://doi.org/10.1016/j.nima.2018.07.055
 Times Cited Count：3 Percentile：23.42(Instruments & Instrumentation)

We have developed a new setup to measure prompt fission $$gamma$$-ray spectra in neutron induced fission up to energies sufficient to reveal the structure associated with giant dipole resonances of fission fragments. The setup consists of multi-wire proportional counters, to detect both fission fragments in coincidence, and two large volume (101.6 mm in diameter and 127.0 mm in length) LaBr$$_{3}$$(Ce) scintillators, to measure the $$gamma$$-rays. The setup was used to obtain the prompt fission $$gamma$$-ray spectrum for thermal neutron induced fission of $$^{235}$$U at the PF1B cold-neutron beam facility of the Institut Laue-Langevin, Grenoble, France. We have successfully measured the $$gamma$$-ray spectrum up to energies of about 20 MeV, what extends the currently known $$gamma$$-ray spectrum limit to higher energies by approximately a factor of two.

Journal Articles

Measurement of high-energy prompt $$gamma$$-rays from neutron induced fission of U-235

Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; L$'e$guillon, R.; Ogawa, Tatsuhiko; Soldner, T.*; Hambsch, F.-J.*; Astier, A.*; Pollitt, A.*; et al.

EPJ Web of Conferences, 146, p.04036_1 - 04036_4, 2017/09

https://doi.org/10.1051/epjconf/201714604036
 Times Cited Count：4 Percentile：87.13(Nuclear Science & Technology)

The measurement of the prompt fission $$gamma$$-ray spectrum (PFGS) is quite important to study the de-excitation process of neutron-rich fission fragments as well as to generate data required to design a generation-IV reactors. The PFGS measured for spontaneous fission of $$^{252}$$Cf shows a broad hump at energies more than 8 MeV. This is interpreted as a giant dipole resonance (GDR) of the fragments centered around 15 MeV. To understand how the GDR is populated in the fission process, one needs to measure the PFGS for the reactions with the mass yields different from the spontaneous fission of $$^{252}$$Cf, such as (n,f). The measurements of the PFGS for (n,f), however, are limited less than 9 MeV even in the recent experiment. This prompts us to make a new measurement to extend the know PFGS up to 20 MeV. The measurement has been carried out at the PF1B beam line of Institut Laue-Langevin. In this contribution we will present the results obtained the measurement.

Journal Articles

Volume-wise destruction of the antiferromagnetic Mott insulating state through quantum tuning

Frandsen, B. A.*; Liu, L.*; Cheung, S. C.*; Guguchia, Z.*; Khasanov, R.*; Morenzoni, E.*; Munsie, T. J. S.*; Hallas, A. M.*; Wilson, M. N.*; Cai, Y.*; et al.

Nature Communications (Internet), 7, p.12519_1 - 12519_8, 2016/08

https://doi.org/10.1038/ncomms12519
 Times Cited Count：44 Percentile：78.39(Multidisciplinary Sciences)

Journal Articles

Quantum renormalization of the spin hall effect

Gu, B.; Gan, J.-Y.*; Bulut, N.*; Ziman, T.*; Guo, G.-Y.*; Nagaosa, Naoto*; Maekawa, Sadamichi

Physical Review Letters, 105(8), p.086401_1 - 086401_4, 2010/08

https://doi.org/10.1103/PhysRevLett.105.086401
 Times Cited Count：32 Percentile：77.93(Physics, Multidisciplinary)

By quantum Monte Carlo simulation of a realistic multi-orbital Anderson impurity model, we have studied the spin-orbit interaction (SOI) of an Fe impurity in Au host metal. We have shown, for the first time, that the SOI is strongly renormalized by the quantum spin fluctuation. Based on this mechanism, we could explain why the gigantic spin hall effect in Au with Fe impurities was observed in recent experiment, while it is not visible in the anomalous hall effect. In addition, we have shown that the SOI is strongly renormalized by the coulomb correlation $$U$$. Based on this picture, we could explain past discrepancies in the calculated orbital angular momenta for an Fe impurity in Au host.

Journal Articles

Resonant Cu $$L$$$$_{alpha,beta}$$ emission spectra of CuGeO$$_{3}$$ single crystal

Agui, Akane; Guo, J.*; Sathe, C.*; Nordgren, J.*; Hidaka, Masanori*; Yamada, Isao*

Physica Status Solidi (C), 3(8), p.2880 - 2883, 2006/09

https://doi.org/10.1002/pssc.200669577
 Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Variation of $$^{14}$$C, $$^{137}$$Cs and stable carbon composition in forest soil and its implications

Guo, J.; Atarashi-Andoh, Mariko; Amano, Hikaru

Journal of Radioanalytical and Nuclear Chemistry, 255(1), p.223 - 229, 2003/01

https://doi.org/10.1023/A:1022281226010
 Times Cited Count：7 Percentile：44.39(Chemistry, Analytical)

Soil organic matter content, $$delta$$$$^{13}$$C, $$^{14}$$C and $$^{137}$$Cs radioactivity were determined in 3 undisturbed forest soil profiles in Ibaraki prefecture, Japan to estimate $$^{14}$$C migration in surface environment. The $$^{137}$$Cs data illustrate that no disturbance has occurred during past years in 3 soil profiles. The peak values are observed in the top 10 cm of the soil profiles. $$^{14}$$C activities were determined with fast bomb combustion-liquid scintillation counting method. $$^{14}$$C determination shows that $$^{14}$$C also has peak values in the top 10 cm of the soil profiles ascribed to the highest bomb $$^{14}$$C level in 1960's.$$delta$$$$^{13}$$C values continuously decreased with increasing soil depth. Enrichment of deeper soils in isotope ratio probably results from discrimination against $$^{13}$$C during mineralization and loss of isotopically lighter carbon from soils due to root uptake, leaching etc.It shows that $$delta$$$$^{13}$$C is an excellent indicator of soil carbon turnover and belowground process.

JAEA Reports

Adsorption mechanisms and models of $$^{85}$$Sr, $$^{237}$$Np, $$^{238}$$Pu and $$^{241}$$Am in loess media (Joint research)

Tanaka, Tadao; Mukai, Masayuki; Maeda, Toshikatsu; Matsumoto, Junko; Ogawa, Hiromichi; Li, S.*; Wang, Z.*; Wang, J.*; Guo, Z.*; Zhao, Y.*

JAERI-Research 2002-034, 20 Pages, 2002/12

JAERI-Research-2002-034.pdf:1.1MB

Adsorption mechanisms and models of $$^{85}$$Sr(II), $$^{237}$$Np(V), $$^{238}$$Pu(IV) and $$^{241}$$Am(III) on the loess were investigated from their adsorption and desorption properties. The distribution coefficient of $$^{85}$$Sr and $$^{237}$$Np was 2 - 3 orders of magnitude smaller than that of $$^{238}$$Pu and $$^{241}$$Am. The adsorption of $$^{85}$$Sr and $$^{237}$$Np was mainly controlled by the ion exchange reaction. On the other hand, the adsorption of $$^{238}$$Pu and $$^{241}$$Am was mostly controlled by the selective chemical reactions with Fe and Mn oxyhydroxide/oxide and humic substances. On the basis of the experimental results, several types of adsorption models of the radionuclides, considering elemental concentrations, adsorption mechanisms and kinetics, were proposed for setting up the analytical systems of radionuclide migration in the loess media.

Journal Articles

Regenerative pulse shaping; A New technique for ultrabroadband amplification

Squier, J.*; Guo, T.*; LeBlanc, C.*; Korn, G.*; Rose-Petruck, C.*; R$'a$ksi, F.*; Yakovlev, V. V.*; Yamakawa, Koichi; Barty, C. P. J.*

Ultrafast Phenomena 10; Springer Series in Chemical Physics 62, p.87 - 89, 1996/00

no abstracts in English

Oral presentation

Measurement of high-energy prompt fission $$gamma$$-ray emission in $$^{235}$$U ($$n_{rm th},f$$)

Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; L$'e$guillon, R.*; Ogawa, Tatsuhiko; Soldner, T.*; K$"o$ster, U.*; Hambsch, F.-J.*; Kawano, Toshihiko*; et al.

no journal, , 

Oral presentation

Measurement of high-energy prompt fission gamma-rays for $$^{235}$$U(n$$_{rm th}$$,f)

Nishio, Katsuhisa; Makii, Hiroyuki; Hirose, Kentaro; Orlandi, R.; L$'e$guillon, R.*; Ogawa, Tatsuhiko; Soldner, T.*; K$"o$ster, U.*; Pollitt, A.*; Hambsch, F.-J.*; et al.

no journal, , 

no abstracts in English

Oral presentation

Spectroscopic investigations for the chemical bond properties of the actinide and lanthanide-soft donor complexes and molecular design of new ion recognition ligands

Yaita, Tsuyoshi; Shuh, D.*; Ikeda, Takashi; Kobayashi, Toru; Suzuki, Shinichi; Okamoto, Yoshihiro; Shiwaku, Hideaki; Ikeda, Atsushi; Akutsu, Kazuhiro; Guo, J.*

no journal, , 

no abstracts in English

Oral presentation

Electronic structure and ion recognition properties of itinerant 5f orbital responsible ligand, phenanthrolineamide (PTA), complex

Yaita, Tsuyoshi; Suzuki, Shinichi; Kobayashi, Toru; Okamoto, Yoshihiro; Shiwaku, Hideaki; Shuh, D.*; Anders, P.*; Guo, J.*

no journal, , 

no abstracts in English

Oral presentation

Measurement of high-energy prompt fission $$gamma$$ rays in $$^{235}$$U(n$$_{th}$$,f)

Ogawa, Tatsuhiko; Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; L$'e$guillon, R.*; Soldner, T.*; Hambsch, F.-J.*; A$"i$che, M.*; Astier, A.*; et al.

no journal, , 

Measurement of $$gamma$$-rays emitted from fission of actinide has been conducted for radiation transport analysis in reactors, safety of spent fuel, and fundamental nuclear physics. In earlier studies, $$gamma$$-rays up to 8 MeV were measured because they are those emitted by fission fragments at excited states. According to some theoretical studies, however, some fission fragments have excitation energy up to 20 MeV and they emit $$gamma$$-rays above 8 MeV. In this study, the $$gamma$$-rays produced by fission of $$^{235}$$U induced by thermal neutrons were measured with LaBr scintillators at the high-flux reactor in the Institut Laue Langevin. The obtained $$gamma$$-ray spectrum agreed with the earlier measurement below 8 MeV, forms a bump above 10 MeV, and smoothly continued up to 20 MeV. The measurement in this study clarified the $$gamma$$-ray energy spectrum attributed to fission reactions up to 20 MeV in case of $$^{235}$$U(n$$_{th}$$,f).

Oral presentation

Measurement of high-energy prompt fission $$gamma$$ rays in $$^{235}$$U(n$$_{th}$$,f)

Ogawa, Tatsuhiko; Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; L$'e$guillon, R.*; Soldner, T.*; Hambsch, F.-J.*; A$"i$che, M.*; Astier, A.*; et al.

no journal, , 

Measurement of $$gamma$$-rays emitted from fission of actinide has been conducted for radiation transport analysis in reactors, safety of spent fuel, and fundamental nuclear physics. In earlier studies, $$gamma$$-rays up to 8 MeV were measured because they are those emitted by fission fragments at excited states. According to some theoretical studies, however, some fission fragments have excitation energy up to 20 MeV and they emit $$gamma$$-rays above 8 MeV. In this study, the $$gamma$$-rays produced by fission of $$^{235}$$U induced by thermal neutrons were measured with LaBr scintillators at the high-flux reactor in the Institut Laue Langevin. The obtained $$gamma$$-ray spectrum agreed with the earlier measurement below 8 MeV, forms a bump above 10 MeV, and smoothly continued up to 20 MeV. The measurement in this study clarified the $$gamma$$-ray energy spectrum attributed to fission reactions up to 20 MeV in case of $$^{235}$$U(n$$_{th}$$,f).

Oral presentation

Measurement of high-energy prompt fission $$gamma$$-rays from neutron induced fission of $$^{235}$$U

Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; L$'e$guillon, R.; Ogawa, Tatsuhiko; Soldner, T.*; Hambsch, F.-J.*; A$"i$che, M.*; Astier, A.*; et al.

no journal, , 

The Japanese government has a plan to remove the fuel debirs for the full deconstruction of Fukushima I Nuclear Power Plants. The fuel debris must be removed without reaching criticality. However, it is difficult to monitor the fission rate due to the background $$gamma$$ rays coming from long-lived fission products. We are proposing to develop a system based on the use of the high-energy prompt fission $$gamma$$ rays, whose energies are high enough to be separated from the background. To design the system, it is essential to know the spectrum of prompt fission $$gamma$$ rays up to more than 7 MeV for $$^{235}$$U($$n, f$$). So far, no data are available in the $$gamma$$-ray energy range larger than 7 MeV. This prompted us to make a new measurement to extend the $$gamma$$-ray spectrum limit to higher energies. The measurement has been carried out at the PF1b cold-neutron beam facility of the Institut Laue-Langevin. In this contribution we will present the results obtained the measurement.

18 (Records 1-18 displayed on this page)
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