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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：12 Percentile：73.85(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：29.78(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

Inter atomic force constants of $$beta$$-PbF$$_{2}$$ from diffuse neutron scattering measurement

Xianglian*; Bao, W.*; Guo, T.*; Li, P.*; Sakuma, Takashi*; Igawa, Naoki

International Journal of Innovation in Science and Mathematics, 5(6), p.165 - 167, 2017/11

Diffuse neutron scattering measurements were performed on powder $$beta$$-PbF$$_{2}$$ at 633 K. Oscillatory diffuse scattering intensities were observed and the observed diffuse scattering intensities were explained by including the correlation effects among thermal displacements of atoms. The force constants among first- and second-nearest-neighboring atoms in $$beta$$-PbF$$_{2}$$ calculated from the values of correlation effects and Debye-Waller temperature parameters were determined as 0.36 eV/ $AA $^{2}$$ at ${it r}$ = 2.599 ${AA}$ and 0.21 eV/ $AA $^{2}$$ at ${it r}$ = 3.001 AA, respectively.

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：90.63(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

Uniaxial pressure effect on the magnetic ordered moment and transition temperatures in BaFe$$_{2-x}$$T$$_{x}$$As$$_{2}$$ ($$T$$ = Co,Ni)

Tam, D. M.*; Song, Y.*; Man, H.*; Cheung, S. C.*; Yin, Z.*; Lu, X.*; Wang, W.*; Frandsen, B. A.*; Liu, L.*; Gong, Z.*; et al.

Physical Review B, 95(6), p.060505_1 - 060505_6, 2017/02

https://doi.org/10.1103/PhysRevB.95.060505
 Times Cited Count：23 Percentile：71.14(Materials Science, Multidisciplinary)

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：33 Percentile：77.01(Multidisciplinary Sciences)

Journal Articles

The Martian surface radiation environment; A Comparison of models and MSL/RAD measurements

Matthi$"a$, D.*; Ehresmann, B.*; Lohf, H.*; K$"o$hler, J.*; Zeitlin, C.*; Appel, J.*; Sato, Tatsuhiko; Slaba, T. C.*; Martin, C.*; Berger, T.*; et al.

Journal of Space Weather and Space Climate (Internet), 6, p.A13_1 - A13_17, 2016/03

https://doi.org/10.1051/swsc/2016008
 Times Cited Count：66 Percentile：93.52(Astronomy & Astrophysics)

The Radiation Assessment Detector (RAD) on the Mars Science Laboratory (MSL) has been measuring the radiation environment on the surface of Mars since August 6th 2012. In this work, several models such as GEANT4, PHITS, and HZETRN/OLTARIS are used to predict the radiation environment caused by galactic cosmic rays on Mars in order to compare and validate them with the experimental results. Although good agreement is found in many cases for GEANT4, PHITS and HZETRN/OLTARIS, some models still show large, sometimes order of magnitude, discrepancies in certain particle spectra. We have found that RAD data is helping make better choices of input parameters and physical models. These results help to predict dose rates for future manned missions as well as to perform shield optimization studies.

Journal Articles

Origin of the spin Seebeck effect in compensated ferrimagnets

Gepr$"a$gs, S.*; Kehlberger, A.*; Coletta, F.*; Qiu, Z.*; Guo, E.-J.*; Schulz, T.*; Mix, C.*; Meyer, S.*; Kamra, A.*; Althammer, M.*; et al.

Nature Communications (Internet), 7, p.10452_1 - 10452_6, 2016/02

https://doi.org/10.1038/ncomms10452
 Times Cited Count：155 Percentile：97.39(Multidisciplinary Sciences)

Journal Articles

In-beam $$gamma$$ spectroscopy of the even-even nucleus $$^{190}$$Pt

Li, G. S.*; Liu, M. L.*; Zhou, X. H.*; Zhang, Y. H.*; Liu, Y. X.*; Zhang, N. T.*; Hua, W.*; Zheng, Y. D.*; Fang, Y. D.*; Guo, S.*; et al.

Physical Review C, 89(5), p.054303_1 - 054303_9, 2014/05

https://doi.org/10.1103/PhysRevC.89.054303
 Times Cited Count：5 Percentile：37.93(Physics, Nuclear)

High-spin states of $$^{190}$$Pt have been reinvestigated using the $$^{176}$$Yb($$^{18}$$O, 4$$n$$) reaction at a beam energy of 88 MeV. The previously known positive parity band associated with the $$nu$$ $$i^{-2}_{13/2}$$ $$nu$$ $$h^{-1}_{9/2}$$ $$nu$$ $$j^{-1}$$ ($$nu j$$ being $$nu p_{3/2}$$ or $$nu f_{5/2}$$) configuration has been revised and extended significantly. A new negative parity band has been established and proposed to be based on the $$nu$$ $$i^{-3}_{13/2}$$ $$nu$$ $$j^{-1}$$ configuration. Possible structure evolution of the yrast line from predominantly vibrational to rotational with increasing spin is discussed with the help of E$$_gamma$$ over spin curves. Additionally, calculations of Total Routhian surfaces have been performed to investigate the band properties.

Journal Articles

Development of a GEM-TPC for H-dibaryon search experiment at J-PARC

Sako, Hiroyuki; Ahn, J. K.*; Baek, K. H.*; Bassalleck, B.*; Fujioka, H.*; Guo, L.*; Hasegawa, Shoichi; Hicks, K.*; Honda, R.*; Hwang, S. H.*; et al.

Journal of Instrumentation (Internet), 9(4), p.C04009_1 - C04009_10, 2014/04

https://doi.org/10.1088/1748-0221/9/04/C04009
 Times Cited Count：3 Percentile：15.93(Instruments & Instrumentation)

A TPC has been developed for J-PARC E42 experiment to search for H-dibaryon in ($$K^-$$, $$K^+$$) reaction. An event with 2 $$pi^-$$ and 2 protons decaying from H-dibaryon is searched for inside the TPC. The TPC has octagonal prism shape drift volume with about 50 cm diameter with 55 cm drift length filled with Ar-CH$$_{4}$$ (90:10) gas. At the end of the drift volume, 3-layer GEMs are equipped. In order to analyze momenta of produced particles, the TPC is applied with 1 T dipole magnetic field parallel to the drift electric field with a superconducting Helmholz magnet. In order to maximize the acceptance of H-dibaryon events, a diamond target is installed inside the TPC drift volume, in a cylindrical hole opened from the top to the middle of the drift volume. Since extremely high-rate $$K^-$$ beam is directly injected into the TPC drift volume to the target, a gating grid and GEMs are adopted to suppress positive-ion feedback.

Journal Articles

High-j proton alignments in $$^{101}$$Pd

Zhou, H. B.*; Zhou, X. H.*; Zhang, Y. H.*; Zheng, Y.*; Liu, M. L.*; Zhang, N. T.*; Chen, L.*; Wang, S. T.*; Li, G. S.*; Wang, H. X.*; et al.

European Physical Journal A, 47(9), p.107_1 - 107_7, 2011/09

https://doi.org/10.1140/epja/i2011-11107-3
 Times Cited Count：4 Percentile：32.67(Physics, Nuclear)

High-spin states in $$^{101}$$Pd have been investigated by means of in-beam $$gamma$$-ray spectroscopic techniques. The previously known $$d$$$$_{5/2}$$ and 1/2$$^-$$[550] bands were extended to higher spins. The band crossings observed experimentally are explained by the alignment of $$g$$$$_{9/2}$$ protons. The band properties in $$^{101}$$Pd are compared with those in the neighboring nuclei and are discussed within the framework of the cranked shell model.

Journal Articles

Giant spin Hall effect of Au films with Pt impurities; Surface-assisted skew scattering

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

Journal of Applied Physics, 109(7), p.070502_1 - 070502_3, 2011/03

We show theoretically a novel route to obtain giant room temperature spin Hall effect (SHE) using surface-assisted skew scattering. By a combined approach of density functional theory and the quantum Monte Carlo (QMC) method, we have studied the SHE due to a Pt impurity in different Au hosts. We show that the spin Hall angle (SHA) could become larger than 0.1 on the Au (111) surface, and decreases by about a half on the Au (001) surface, while it is small in bulk Au. The QMC results show that the spin-orbit interaction (SOI) of the Pt impurity on the Au (001) and Au (111) surfaces is enhanced, because the Pt 5$$d$$ levels are lifted to the Fermi level due to the valence fluctuations. In addition, there are two SOI channels on the Au (111) surface, while only one for Pt either on the Au (001) surface or in bulk Au.

Journal Articles

Surface-assisted spin Hall effect in Au films with Pt impurities

Gu, B.; Sugai, Isamu*; Ziman, T.*; Guo, G. Y.*; Nagaosa, Naoto; Seki, Takeshi*; Takanashi, Koki; Maekawa, Sadamichi

Physical Review Letters, 105(21), p.216401_1 - 216401_4, 2010/11

https://doi.org/10.1103/PhysRevLett.105.216401
 Times Cited Count：71 Percentile：90.34(Physics, Multidisciplinary)

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：79.47(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

Identification of a new band and its signature inversion in $$^{174}$$Re

Zhang, Y. H.*; Guo, S.*; Zhou, X. H.*; Ma, L.*; Guo, W. T.*; Oshima, Masumi; Toh, Yosuke; Koizumi, Mitsuo; Osa, Akihiko; Kimura, Atsushi; et al.

Chinese Physics Letters, 24(5), p.1203 - 1206, 2007/05

https://doi.org/10.1088/0256-307X/24/5/021

High-spin states in $$^{174}$$Re are investigated via in-beam $$gamma$$-ray spectroscopic method and $$gamma - gamma$$ coincidence relationships are analysed. A new band is identified due to its spectroscopic connection with the known $$pi 1/2^-[541] bigotimes nu 1/2^-[521]$$ band. This band is proposed to be the ground-state band built on the $$pi 1/2^-[541] bigotimes nu 5/2^-[512]$$ configuration in view of the low-lying intrinsic states in neighbouring odd-mass nuclei. It is in particular interesting that the new band exhibits a phenomenon of low-spin signature inversion, providing a new situation for theoretical investigations.

Journal Articles

Self-guiding of 100 TW femtosecond laser pulses in centimeter-scale underdense plasma

Chen, L.-M.; Kotaki, Hideyuki; Nakajima, Kazuhisa*; Koga, J. K.; Bulanov, S. V.; Tajima, Toshiki; Gu, Y. Q.*; Peng, H. S.*; Wang, X. X.*; Wen, T. S.*; et al.

Physics of Plasmas, 14(4), p.040703_1 - 040703_4, 2007/04

https://doi.org/10.1063/1.2720374
 Times Cited Count：36 Percentile：75.41(Physics, Fluids & Plasmas)

An experiment for the laser self-guiding studies has been carried out with 100 TW laser pulse interaction with the long underdense plasma. Formation of extremely long plasma channel with its length, about 10 mm, 20 times above the Rayleigh length is observed. The self-focusing channel features such as the laser pulse significant bending and the electron cavity formation are demonstrated experimentally for the first time.

Journal Articles

Band properties of the transitional nucleus $$^{187}$$Pt

Zhou, X. H.*; Xing, Y. B.*; Liu, M. L.*; Zhang, Y. H.*; Guo, Y. X.*; Ma, L.*; Lei, X. G.*; Guo, W. T.*; Oshima, Masumi; Toh, Yosuke; et al.

Physical Review C, 75(3), p.034314_1 - 034314_17, 2007/03

https://doi.org/10.1103/PhysRevC.75.034314
 Times Cited Count：18 Percentile：73.83(Physics, Nuclear)

High-spin states in $$^{187}$$Pt has been studied experimentally by in-beam $$gamma$$-ray spectroscopy. The previously known bands based on the $$nu i_{13/2}, nu 7/2^{-}[503] $$ and $$nu i^{2}_{13/2} nu j$$ configurations have been extended to high-spin states, and new rotational bands associated with the $$nu 3/2^{-}[512]$$ and $$nu 1/2^{-}[521]$$ Nilsson orbits have been identified. The total Routhian surface calculations indicate that the transitional nucleus $$^{187}$$Pt is very soft with respect to $$beta$$ and $$gamma$$ deformations. The band properties have been compared with the systematics observed in neiboring nuclei and have been interpreted within the framework of the cranked shell model.

Journal Articles

Search for signature inversion in the $$pi i_{13/2} bigotimes nu i_{13/2}$$ bands in $$^{182,184,186}$$Au

Zhang, Y. H.*; Zhou, X. H.*; He, J. J.*; Liu, Z.*; Fang, Y. D.*; Guo, W. T.*; Lei, X. G.*; Guo, Y. X.*; Ndontchueng, M. M.*; Ma, L.*; et al.

International Journal of Modern Physics E, 15(7), p.1437 - 1445, 2006/10

https://doi.org/10.1142/S0218301306005125
 Times Cited Count：3 Percentile：28.12(Physics, Nuclear)

Search for low-spin signature inversion in the $$pi i_{13/2} bigotimes nu i_{13/2}$$ bands in odd-odd $$^{182,184,186}$$Au have been made through in-beam $$gamma$$-ray spectroscopy techniques. The $$pi i_{13/2} bigotimes nu i_{13/2}$$ bands in the three nuclei have been identified and extended up to high-spin states. In particlular, the interband connection between the $$pi i_{13/2} bigotimes nu i_{13/2}$$ band and the ground-state band in $$^{184}$$Au have been established, leading to a firm spin-and-parity assignment for the $$pi i_{13/2} bigotimes nu i_{13/2}$$ band. The low-spin signature inversion is found in the $$pi i_{13/2} bigotimes nu i_{13/2}$$ bands in $$^{182,184,186}$$Au.

Journal Articles

Direct observation of interface effects of thin AlAs(100) layers buried in GaAs

Agui, Akane; Sathe, C.*; Guo, J.-H.*; Nordgren, J.*; Mankefors, S.*; Nilsson, P. O.*; Kanski, J.*; Andersson, T. G.*; Karlsson, K.*

Applied Surface Science, 166(1-4), p.309 - 312, 2000/10

https://doi.org/10.1016/S0169-4332(00)00468-2
 Times Cited Count：2 Percentile：15.65(Chemistry, Physical)

no abstracts in English

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

26 (Records 1-20 displayed on this page)