Microscopic origin of the spin-reorientation transition in the kagome topological magnet TbMnSn

Huang, Z.*; Wang, W.*; Ye, H.*; Bao, S.*; Shangguan, Y.*; Liao, J.*; Cao, S.*; Kajimoto, Ryoichi; Ikeuchi, Kazuhiko*; Deng, G.*; et al.

Physical Review B, 109(1), p.014434_1 - 014434_9, 2024/01

https://doi.org/10.1103/PhysRevB.109.014434

The Application of radiochronometry during the 4th collaborative materials exercise of the nuclear forensics international technical working group (ITWG)

Kristo, M. J.*; Williams, R.*; Gaffney, A. M.*; Kayzar-Boggs, T. M.*; Schorzman, K. C.*; Lagerkvist, P.*; Vesterlund, A.*; Ramebck, H.*; Nelwamondo, A. N.*; Kotze, D.*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 315(2), p.425 - 434, 2018/02

https://doi.org/10.1007/s10967-017-5680-5

In a recent international exercise, 10 international nuclear forensics laboratories successfully performed radiochronometry on three low enriched uranium oxide samples, providing 12 analytical results using three different parent-daughter pairs serving as independent chronometers. The vast majority of the results were consistent with one another and consistent with the known processing history of the materials. In general, for these particular samples, mass spectrometry gave more accurate and more precise analytical results than decay counting measurements. In addition, the concordance of the U-Pa and U-Th chronometers confirmed the validity of the age dating assumptions, increasing confidence in the resulting conclusions.

Ultra-trace analysis of plutonium by thermal ionization mass spectrometry with a continuous heating technique without chemical separation

Lee, C.-G.*; Suzuki, Daisuke; Esaka, Fumitaka; Magara, Masaaki; Song, K.*

Talanta, 141, p.92 - 96, 2015/08

https://doi.org/10.1016/j.talanta.2015.03.060

Thermal ionization mass spectrometry (TIMS) with a continuous heating technique is known as an effective method for measuring the isotope ratio in trace amounts of uranium. In this study, the analytical performance of thermal ionization mass spectrometry with a continuous heating technique was investigated using a standard plutonium solution (SRM 947). The influence of the heating rate of the evaporation filament on the precision and accuracy of the isotope ratios was examined using a plutonium solution sample at the fg level. Changing the heating rate of the evaporation filament on samples ranging from 0.1 fg to 1000 fg revealed that the influence of the heating rate on the precision and accuracy of the isotope ratios was slight around the heating rate range of 100 to 250 mA/min. All of the isotope ratios of plutonium (SRM 947), Pu/Pu, Pu/Pu, Pu/Pu and Pu/Pu, were measured down to sample amounts of 70 fg. The ratio of Pu/Pu was measured down to a sample amount of 0.1 fg, which corresponds to a PuO particle with a diameter of 0.2 m. Moreover, the signals of Pu could be detected with a sample amount of 0.03 fg, which corresponds to the detection limit of Pu of 0.006 fg as estimated by the 3 criterion. Pu and Am formed by the decay of Pu could be discriminated owing to the difference in the evaporation temperature. As a result, Pu/Pu as well as Pu/Pu and Pu/Pu in plutonium samples could be measured by TIMS with a continuous heating technique and without any chemical separation processes.

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Kataoka, Takashi*; Kobayashi, Masaki*; Sakamoto, Yuta*; Song, G. S.*; Fujimori, Atsushi*; Chang, F.-H.*; Lin, H.-J.*; Huang, D. J.*; Chen, C. T.*; Okochi, Takuo*; et al.

Journal of Applied Physics, 107(3), p.033718_1 - 033718_7, 2010/02

AA2009-0977.pdf:1.0MB

https://doi.org/10.1063/1.3294620

Hybridization between the conduction band and 3 orbitals in the oxide-based diluted magnetic semiconductor InVO

Kobayashi, Masaki*; Ishida, Yukiaki*; Hwang, J. I.*; Song, G. S.*; Takizawa, Masaru*; Fujimori, Atsushi; Takeda, Yukiharu; Okochi, Takuo*; Okane, Tetsuo; Saito, Yuji; et al.

Physical Review B, 79(20), p.205203_1 - 205203_5, 2009/05

https://doi.org/10.1103/PhysRevB.79.205203

Soft X-ray absorption and photoemission studies of ferromagnetic Mn-implanted 3-SiC

Song, G.*; Kobayashi, Masaki*; Hwang, J. I.*; Kataoka, Takashi*; Takizawa, Masaru*; Fujimori, Atsushi; Okochi, Takuo; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; et al.

Japanese Journal of Applied Physics, 47(9), p.7113 - 7116, 2008/09

https://doi.org/10.1143/JJAP.47.7113

Local electronic structure of Cr in the II-VI diluted ferromagnetic semiconductor ZnCrTe

Kobayashi, Masaki*; Ishida, Yukiaki*; Hwang, J. I.*; Song, G. S.*; Fujimori, Atsushi; Yang, C. S.*; Lee, L.*; Lin, H.-J.*; Huang, D.-J.*; Chen, C. T.*; et al.

New Journal of Physics (Internet), 10, p.055011_1 - 055011_15, 2008/05

https://doi.org/10.1088/1367-2630/10/5/055011

Ultra-trace analysis of plutonium isotopes by thermal ionization mass spectrometry with a continuous heating technique without chemical separation

Lee, C. G.*; Suzuki, Daisuke; Esaka, Fumitaka; Magara, Masaaki; Song, K.*

no journal, , 

In this study, analytical performances of TIMS with a continuous heating method were investigated using plutonium standard solution (SRM 947) and mixed particulate sample containing plutonium (SRM947) and uranium (U500). In order to examine the analytical performance of plutonium solution sample, the influence of heating rate of evaporation filament on precision and accuracy of isotope ratios was studied using plutonium solution sample of fg level. Changing the heating rate of evaporation filament on samples ranging from 0.1 fg to 1000 fg revealed that no influence of heating rate on precision and accuracy of isotope ratios occurred over the heating rate range from 100 to 250 mA/min. All of the isotope ratios on plutonium were measured down to sample amounts of 70 fg. In the mixture samples of plutonium and uranium, Pu and U were clearly distinguished due to the difference of evaporation temperature between Pu and U. As a result, the ratios of plutonium sample were successfully measured by TIMS with a continuous heating technique without any chemical separations.