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Mo hot atoms made by a neutron capture method from 
-MoO
to waterQuach, N. M.*; Ngo, M. C.*; Yang, Y.*; Nguyen, T. B.*; Nguyen, V. T.*; Fujita, Yoshitaka; Do, T. M. D.*; Nakayama, Tadachika*; Suzuki, Tatsuya*; Suematsu, Hisayuki*
Journal of Radioanalytical and Nuclear Chemistry, 332(10), p.4057 - 4064, 2023/10
Times Cited Count：0 Percentile：0.01(Chemistry, Analytical)Technetium-99m (
Tc) is the most widely used medical radioisotope in the world and is produced from molybdenum-99 (Mo). Production of Mo via the neutron capture method draws attention as an alternative to fission-derived Mo due to non-proliferation issues, but the specific radioactivity of Mo is extremely low. In this work, a porous -MoO wire was prepared as an irradiation target in order to improve the specific activity by extracting Mo. Porous -MoO wire is synthesized from Mo metal wire by a two-step heating procedure. The hot atom effect of Mo was confirmed by activity and isotope measurements of the porous -MoO wire after neutron irradiation and the water used for extraction. In term of the extraction effectiveness, the effectiveness of Mo extraction in the porous -MoO wire was comparable to that of commercial -MoO powder.
Nguyen, T. H.*; Le Ba, T.*; Tran, C. T.*; Nguyen, T. T.*; Doan, T. T. T.*; Do, V. K.; Watanabe, Masayuki; Pham, Q. M.*; Hoang, S. T.*; Nguyen, D. V.*; et al.
Hydrometallurgy, 213, p.105933_1 - 105933_11, 2022/08
Times Cited Count：9 Percentile：83.6(Metallurgy & Metallurgical Engineering)A continuous counter-current extraction for the selective recovery of thorium (Th) and uranium (U) from the Yen Phu (Vietnam) rare earth concentrate leach solutions was systematically studied. The primary amine N1923 was used as an extractant which was prepared in the isoparaffin IP-2028 diluent. Thorium and uranium were selectively recovered in a hydrometallurgical circuit established by continuous mixer-settler extraction, scrubbing, and back-extraction at the laboratory scale. The desired purity of Th and U can be achieved by managing the volume ratio of organic to aqueous phase (O/A ratio) in the corresponding steps. Highly pure Th and U were recovered from the pregnant back-extraction liquor and the raffinate, respectively, which have satisfactory properties for further processing of the subsequent nuclear materials.
collisions at 
= 200 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review D, 84(1), p.012006_1 - 012006_18, 2011/07
Times Cited Count：29 Percentile：72.31(Astronomy & Astrophysics)We report on the event structure and double helicity asymmetry (
) of jet production in longitudinally polarized collisions at = 200 GeV. Photons and charged particles were measured by the PHENIX experiment. Event structure was compared with the results from PYTHIA event generator. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order perturbative QCD calculation. We measured = -0.0014 
0.0037 at the lowest 
bin and -0.0181 0.0282 at the highest bin. The measured is compared with the predictions that assume various 
distributions.
collisions at = 200 and 62.4 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06
Times Cited Count：184 Percentile：99.44(Physics, Nuclear)Transverse momentum distributions and yields for 
, and 
in collisions at = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different collisions. We also present the scaling properties such as 
and 
scaling and discuss the mechanism of the particle production in collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.
Eto, Takeharu*; Dao, V. T. S.*; Nguyen, H. D.*; Fife, K.*; Kureta, Masatoshi; Segawa, Mariko; Arai, Masatoshi; Shinohara, Takenao
Proceedings of 2011 International Image Sensor Workshop (IISW), 4 Pages, 2011/06
http://www.imagesensors.org/Past%20Workshops/2011%20Workshop/2011%20Papers/R57_Etoh_HighSpeedCCD.pdfThis paper reviews progress of technologies on ultra-high-speed image sensors with in-situ CCD signal storage. The CCD storage for each pixel has more than one hundred CCD memory elements. Simultaneous parallel recording of signals at all pixels enables ultra-high-speed capturing of consecutive images.
and Au+Au collisions at 
= 200 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.
Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04
Times Cited Count：8 Percentile：49.7(Physics, Nuclear)Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to collisions.
+ collisions at = 200 GeV and scaling properties of hadron productionAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review D, 83(5), p.052004_1 - 052004_26, 2011/03
Times Cited Count：175 Percentile：98.48(Astronomy & Astrophysics)The PHENIX experiment at RHIC has measured the invariant differential cross section for production of 
, 
, 
and 
mesons in collisions at = 200 GeV. The spectral shapes of all hadron transverse momentum distributions are well described by a Tsallis distribution functional form with only two parameters, 
and 
, determining the high 
and characterizing the low regions for the spectra, respectively. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.
Hidaka, Koshi*; Kimura, Toru*; Abdel-Rahman, H. M.*; Nguyen, J.-T.*; McDaniel, K. F.*; Kohlbrenner, W. E.*; Molla, A.*; Adachi, Motoyasu; Tamada, Taro; Kuroki, Ryota; et al.
Journal of Medicinal Chemistry, 52(23), p.7604 - 7617, 2009/07
Times Cited Count：19 Percentile：44.7(Chemistry, Medicinal)A series of HIV protease inhibitor based on the allophenylnorstatine structure with various P2' moieties were synthesized. Among these analogues, we discovered that a small allyl group would maintain potent enzyme inhibitory activity compared to that of the 
-methylbenzyl moiety in clinical candidate 1 (KNI-764, also known as JE-2147, AG-1776 or SM-319777). Introduction of an anilinic amino group to 2 (KNI-727) improved water-solubility and anti-HIV-1 activity. X-ray crystallographic analysis of 13k (KNI-1689) with a 
-methallyl group at P2' position revealed hydrophobic interactions with Ala28, Ile84, and Ile50' similar to that of 1. The presence of an additional methyl group on the allyl group in compound 13k significantly increased anti-HIV activity over 1, while providing a rational drug design for structural minimization and improving membrane permeability.
SiNguyen, D.; Matsuda, Tatsuma; Ikeda, Shugo*; Yamamoto, Etsuji; Haga, Yoshinori; Takeda, Yuji*; Endo, Toyoaki*; Doi, Yusuke*; Settai, Rikio*; Harima, Hisatomo*; et al.
Journal of the Physical Society of Japan, 77(9), p.094702_1 - 094702_6, 2008/09
Times Cited Count：15 Percentile：64.38(Physics, Multidisciplinary)We have succeeded in growing a high-quality single crystal of a non-4
reference compound YCuSi for a heavy-fermion superconductor CeCuSi, and observed the de Haas-van Alphen (dHvA) oscillation. The detected dHvA branches in YCuSi indicate that the Fermi surfaces are multiply connected, and the dHvA frequencies are in the range from 9
to 2
Oe. These dHvA branches are found to be well explained by the results of energy band calculations. The corresponding cyclotron masses are light, ranging from 0.4 to 1.5 
, and are consistent with the electronic specific heat coefficient of 2.2 mJ/K
mol.
Rh
Ga
with quasi-two-dimensional electronic stateNguyen, D.; Matsuda, Tatsuma; Haga, Yoshinori; Ikeda, Shugo*; Yamamoto, Etsuji; Endo, Toyoaki*; Settai, Rikio*; Harima, Hisatomo*; Onuki, Yoshichika
Journal of the Physical Society of Japan, 77(6), p.064708_1 - 064708_6, 2008/06
Times Cited Count：1 Percentile：11.66(Physics, Multidisciplinary)We succeeded in growing a single crystal of a layered compound LuRhGa with an YCoGa-type orthorhombic crystal structure by the Ga-flux method. The lattice, positional, and thermal parameters were determined by single-crystal X-ray diffraction measurement. We also measured the electrical resistivity, specific heat, and de Haas-van Alphen (dHvA) effect. The detected dHvA branches were well explained by the results of full potential LAPW energy band calculations. The electronic state was found to be quasi-two-dimensional, indicating nearly cylindrical Fermi surfaces along the [001] direction.
(T:transition metal) and PrCoGe with the non-centrosymmetric crystal structureKawai, Tomoya*; Muranaka, Hiroshi*; Endo, Toyoaki*; Nguyen, D.; Doi, Yusuke*; Ikeda, Shugo*; Matsuda, Tatsuma; Haga, Yoshinori; Harima, Hisatomo*; Settai, Rikio*; et al.
Journal of the Physical Society of Japan, 77(6), p.064717_1 - 064717_15, 2008/06
Times Cited Count：44 Percentile：83.61(Physics, Multidisciplinary)Fermi surfaces of the non-centrosymmetric LaTGe and PrCoGe have been studied in detail using the de Haas-van Alphen effect. Splitting of the conduction bands due to the spin-orbit interaction was clearly observed. These results are important in understanding the exotic superconductivity realized in non-centrosymmetric structure.
Pd
Al
Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo; Yamamoto, Etsuji; Nguyen, D.; Onuki, Yoshichika
Journal of the Physical Society of Japan, 77(Suppl.A), p.365 - 367, 2008/00
Times Cited Count：5 Percentile：38.74(Physics, Multidisciplinary) and CeIrSi with the non-centrosymmetric crystal structureOkuda, Yusuke*; Miyauchi, Yuichiro*; Ida, Yuki*; Takeda, Yuji*; Tonohiro, Chie*; Ozuchi, Yasuhiro*; Yamada, Tsutomu*; Nguyen, D.; Matsuda, Tatsuma; Haga, Yoshinori; et al.
Journal of the Physical Society of Japan, 76(4), p.044708_1 - 044708_11, 2007/04
Times Cited Count：87 Percentile：91.8(Physics, Multidisciplinary)Single crystals of LaIrSi and CeIrSi were grown by the Czochralski pulling method in a tetra-arc furnace and the magnetic and superconducting properties, together with super- conductivity in CeIr
Co
Si, were clarified by measuring the electrical resistivity, specific heat, magnetic susceptibility, magnetization and de Haas-van Alphen (dHvA) effect. From the results of the dHvA experiment for LaIrSi, the Fermi surface is found to split into two Fermi surfaces due to the spin-orbit interaction arising from the non-centrosymmetric crystal structure. The electronic state of CeIrSi is tuned from the antiferro- magnetic state to the superconducting state by applying pressure. The upper critical field H
(0) at a pressure of 2.65 GPa is found to be highly anisotropic. Large magnitude and anisotropy of H(0) in CeIrSi are consistent with the theoretical prediction for superconductivity in the non-centrosymmetric crystal structure.
PdSi
Nguyen, D.; Haga, Yoshinori; Matsuda, Tatsuma; Yamada, Tsutomu*; Thamizhavel, A.*; Okuda, Yusuke*; Takeuchi, Tetsuya*; Sugiyama, Kiyohiro*; Hagiwara, Masayuki*; Kindo, Koichi*; et al.
Journal of the Physical Society of Japan, 76(2), p.024702_1 - 024702_6, 2007/02
Times Cited Count：5 Percentile：37.28(Physics, Multidisciplinary)We succeeded in growing a single crystal of CePdSi with the orthorhombic crystal structure by the Sn-flux method and measured the electrical resistivity, specific heat, magnetic susceptibility and magnetization. The antiferromagnetic ordering was confirmed to be 
= 7.2 K. The electronic specific heat coefficient was determined as 77 mJ/Kmol
Ce. The antiferromagnetic easy-axis was found to be the [001] direction, with an ordered moment of 
= 1.3 
/Ce, while [100] and [010] directions are hard-axes in magnetization. We observed a metamagnetic transition at 5.7 T for 
[001] and a saturation of magnetization above 12.1 T. The characteristic magnetic phase diagram was constructed. The crystalline electric field (CEF) scheme was proposed for CePdSi, where the splitting energies between the ground state and two excited doublets in the CEF scheme are estimated to be 87 K and 504 K, respectively.
Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo; Nguyen, D.; Tateiwa, Naoyuki; Sakai, Hironori; Yamamoto, Etsuji; Onuki, Yoshichika*
no journal, ,
Among the U-Pd-Al ternary phases, UPdAl is a well-known heavy fermion antiferromagnetic superconductor. We investigated this phase to find new compounds with novel physical properties. Using the Al-flux method, we found a new ternary compound with the hexagonal structure. From the EPMA and single crystal X-ray structural analyses, the composition was found approximately to beU
PdAl. This is similar to the U-Fe-Si compound reported by Noguchi et al.
Si
O
Do, Thi Mai Dung*; Ngarayana, I.*; Nguyen, H. D.*; Murakami, Kenta*; Suematsu, Hisayuki*; Koide, Manabu*; Nakajima, Kunihisa; Suzuki, Eriko; Osaka, Masahiko
no journal, ,
CsSiO powder was synthesized by wet method using cesium carbonate powder and colloidal silica 40 wt.% suspension in HO as starting materials. The characteristic of CsSiO is investigated by using X-ray diffraction, Raman and Thermogravimetry-differential scanning calorimetry. The structure of CsSiO was analyzed by Transmission Electron Microscope.
targets; Contribution by vietnamese institutes, staffs and studentsSuematsu, Hisayuki*; Ngo, M. C.*; Quach, N. M.*; Fujita, Yoshitaka; Do, T. M. D.*; Nakayama, Tadachika*; Suzuki, Tatsuya*; Nguyen, V. T.*; Niihara, Koichi*
no journal, ,
Radiopharmacies have been used in various medical diagnoses/therapies and their market has been growing by ten times in fifteen years. In particular, Tc has been widely used in gamma ray diagnoses. Mo, the raw material for Tc, is currently produced as a fission product by irradiating highly enriched uranium in nuclear reactors. Efforts are being made worldwide to reduce the use of uranium from the perspective of nuclear non-proliferation. A 
Mo(n,
)Mo reaction in low enriched uranium reactors can be an alternative method. In this research, we revealed that -MoO, a low-temperature phase of MoO, as a neutron irradiation target promotes the diffusion of Mo from the target to water due to the hot atom effect. Utilizing this phenomenon can contribute to the stable supply of Mo and Tc. The first nuclear reaction in/water dispersion experiments using an -MoO powder target was carried out in Dalat Nuclear Reactor, Vietnam Atomic Energy Institute to show the hot atom effect. Then, the water recovery efficiency was dramatically improved using a novel -MoO whisker target by Vietnamese students and staffs. Their contributions to this research will be explained in the presentation.