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Journal Articles

Sensitive $$^{236}$$U/$$^{238}$$U isotopic analysis of trace uranium in safeguards environmental samples using multicollector inductively coupled plasma mass spectrometry

Tomita, Jumpei; Tomita, Ryohei; Suzuki, Daisuke; Yasuda, Kenichiro; Miyamoto, Yutaka

Journal of the American Society for Mass Spectrometry, 35(6), p.1178 - 1183, 2024/05

https://doi.org/10.1021/jasms.4c00014
 Times Cited Count：0 Percentile：0.00(Biochemical Research Methods)

A sensitive analytical technique was investigated in order to determine 10$$^{-7}$$ order of $$^{236}$$U/$$^{238}$$U ratio in the sub-ng of uranium using a multi-collector ICP-MS. First, the solution volume was concentrated to one tenth to obtain higher intensities. Next, data acquisition was started from the beginning of the solution uptake and continued until all solution was exhausted. Taking advantage of multi-collector measurement, all data were used with excepting the portion affected by air mixing at the beginning and end of sample introduction. The isotope ratios were calculated from the total counts of each isotope. This technique was applied to U isotope standard (IRMM-184) to measure the 10$$^{-7}$$ order of $$^{236}$$U/$$^{238}$$U ratio in the sub-ng of uranium. Measured values were in good agreement with the certified value within the uncertainity ($$k$$=2). The uncertainties obtained with this new technique (32% on average) were revised to be 10 times smaller than those obtained with the conventionalmethod.

Journal Articles

Evidence of complete fusion in the sub-barrier $$^{16}$$O+$$^{238}$$U reaction

Nishio, Katsuhisa; Ikezoe, Hiroshi; Nagame, Yuichiro; Asai, Masato; Tsukada, Kazuaki; Mitsuoka, Shinichi; Tsuruta, Kaoru; Sato, Kenichiro; Lin, C. J.; Osawa, Takaaki*

Physical Review Letters, 93(16), p.162701_1 - 162701_4, 2004/10

https://doi.org/10.1103/PhysRevLett.93.162701
 Times Cited Count：85 Percentile：90.21(Physics, Multidisciplinary)

The fission fragment angular distributions for reactions using actinide targets such as $$^{16}$$O+$$^{238}$$U show anomalously large anisotropy than the prediction of the transition state model. To interprete this phenomenon, the orientation dependent quasi-fission model was proposed. As the $$^{238}$$U has prolate deformation, the interaction of $$^{16}$$O with the $$^{238}$$U in the sub-barrier region is restricted to the tip collisions. Hinde et al. interpreted that the anomalously large angular anisotropy is due to the quasi-fission, that is the complete fusion is not achieved in the sub-barrier region. The presence (or absence) of the complete fision is found by measuring the evaporation residue cross sections. We measured the evaporation residue cross sections for $$^{16}$$O+$$^{238}$$U by using the $$^{16}$$O beams supplied by the JAERI-tandem accelerator. As a result, complete fusion was observed in the sub-barrier region and no significant fusion hindrace was observed.

Journal Articles

Measurement of intrinsic radioactivity in a GSO crystal

Wang, S. C.*; Wong, H. T.*; Fujiwara, Mamoru

Nuclear Instruments and Methods in Physics Research A, 479(2-3), p.498 - 510, 2002/03

https://doi.org/10.1016/S0168-9002(01)00929-9
 Times Cited Count：24 Percentile：79.81(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Adjustment of total delayed neutron yields of $$^{235}$$U, $$^{238}$$U and $$^{239}$$Pu in JENDL-3.2 using benchmark experiments on effective delayed neutron fraction $$beta_{eff}$$

Sakurai, Takeshi; Okajima, Shigeaki

Journal of Nuclear Science and Technology, 39(1), p.19 - 30, 2002/01

https://doi.org/10.3327/jnst.39.19
 Times Cited Count：6 Percentile：38.77(Nuclear Science & Technology)

The cross section adjustment method was applied to total delayed neutron yields of $$^{235}$$U, $$^{238}$$U and $$^{239}$$Pu of the JENDL-3.2 file by using experimental results of effective delayed neutron fraction $$beta_{eff}$$ at six cores built in two fast critical facilities of the MASURCA and FCA and a thermal critical facility of the TCA to improve these yields. The adjustment was carried out on the yields given at several incident neutron energy points in the file. After the adjustment, the yield of $$^{238}$$U was almost uniformly decreased by about 3% below 7 MeV. The yield of $$^{239}$$Pu was increased by 2.6% and that of $$^{235}$$U was decreased by 0.9% at the thermal energy point, while the change of yield was less than 0.3% at the other energy points for these nuclides. By using these adjusted yields, the uncertainty of calculated $$beta_{eff}$$ was reduced and the agreement of $$beta_{eff}$$ between experiment and calculation was improved.

Journal Articles

$$^{238}$$U and $$^{57}$$Fe M$"o$ssbauer spectroscopic study of UFe$$_{2}$$

Tsutsui, Satoshi; Nakada, Masami; Kobayashi, Yasuhiro*; Nasu, Saburo*; Haga, Yoshinori; Onuki, Yoshichika

Hyperfine Interactions, 133(1-4), p.17 - 21, 2001/11

no abstracts in English

Journal Articles

$$^{238}$$U M$"o$ssbauer study of UPt$$_{3}$$

Tsutsui, Satoshi; Nakada, Masami; Nasu, Saburo*; Haga, Yoshinori; Yamamoto, Etsuji; Kimura, Noriaki*; Onuki, Yoshichika

Journal of Magnetism and Magnetic Materials, 226-230(Part.1), p.87 - 88, 2001/05

no abstracts in English

Journal Articles

$$^{238}$$U M$"o$ssbauer spectroscopic study of UX$$_{2}$$(X=Ga, P, As, Sb)

Tsutsui, Satoshi; Nakada, Masami; Nasu, Saburo*; Haga, Yoshinori; Homma, Tetsuo; Yamamoto, Etsuji; Tokiwa, Yoshifumi; Aoki, Dai*; Wi$'s$niewski, P.*; Onuki, Yoshichika

Journal of the Physical Society of Japan, Vol.70, Supplement A, p.34 - 36, 2001/05

no abstracts in English

JAEA Reports

Measurement of $$^{238}$$U Doppler Effect using various samples in FCA XVII-1

Ando, Masaki; Okajima, Shigeaki; Oigawa, Hiroyuki

JAERI-Research 2001-017, 20 Pages, 2001/03

JAERI-Research-2001-017.pdf:0.82MB

$$^{238}$$U Doppler effect measurements were carried out using 6 uranium samples with various composition or diameter varying self-shielding factors of $$^{238}$$U. Calculation accuracy of the standard analysis method for fast reactor cores at FCA was investigated.The Doppler effect were measured by the sample-heated and reactivity worth measurement method up to 800 degree in the FCA XVII-1 assembly, which simulated Na-cooled MOX fueled FBR. In the analysis, the Doppler effect was calculated using the effective cross sections obtained by the PEACO-X code. The calculated values based on the diffusion theory agreed well with the experiment for the U-metal and UO$$_{2}$$ samples. The calculation underestimated the experiment from 10% to 30% for the UO$$_{2}$$ samples containing BeO. This underestimation was improved by the use of the transport calculation. The calculation, however, underestimated about 20% for the sample whose background cross section is greater than 300 barns.

Journal Articles

$$^{238}$$U M$"o$ssbauer study on the magnetic properties of uranium-based heavy fermion superconductors

Tsutsui, Satoshi; Nakada, Masami; Nasu, Saburo*; Haga, Yoshinori; Homma, Tetsuo; Yamamoto, Etsuji; Okuni, Hitoshi*; Onuki, Yoshichika

Hyperfine Interactions, 126(1-4), p.335 - 340, 2000/07

https://doi.org/10.1023/A:1012626913681
 Times Cited Count：6 Percentile：37.54(Physics, Atomic, Molecular & Chemical)

no abstracts in English

Journal Articles

$$^{238}$$U M$"o$ssbauer spectrosopic study of UPd$$_{2}$$Al$$_{3}$$ and URu$$_{2}$$Si$$_{2}$$

Tsutsui, Satoshi; Nakada, Masami; Nasu, Saburo*; Haga, Yoshinori; Homma, Tetsuo; Yamamoto, Etsuji; Okuni, Hitoshi*; Onuki, Yoshichika

Physica B; Condensed Matter, 281-282, p.242 - 243, 2000/06

https://doi.org/10.1016/S0921-4526(99)01080-7
 Times Cited Count：3 Percentile：21.51(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Nucleon optical potential of Uranium-238 up to 150MeV

Sukhovitskii, E. S.*; Iwamoto, Osamu; Chiba, Satoshi; Fukahori, Tokio

Journal of Nuclear Science and Technology, 37(2), p.120 - 127, 2000/02

https://doi.org/10.3327/jnst.37.120

no abstracts in English

Journal Articles

Isomeric yield ratios of $$^{134}$$I and $$^{136}$$I in the proton-, $$^{12}$$C- and $$^{19}$$F-induced fission of $$^{235}$$U, $$^{237}$$Np and $$^{238}$$U

Shinohara, Nobuo; Tsukada, Kazuaki; Ichikawa, Shinichi; Magara, Masaaki; Hatsukawa, Yuichi

Radiochimica Acta, 88(1), p.1 - 5, 2000/00

https://doi.org/10.1524/ract.2000.88.1.001
 Times Cited Count：1 Percentile：11.79(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

$$^{238}$$U Moessbauer spectroscopy of UGe$$_{2}$$

Tsutsui, Satoshi*; Nakada, Masami; Saeki, Masakatsu; Nasu, Saburo*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika*

Physical Review B, 60(1), p.37 - 39, 1999/07

https://doi.org/10.1103/PhysRevB.60.37
 Times Cited Count：11 Percentile：53.89(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

$$^{238}$$U optical potential up to 100MeV incident nucleon energies

Sukhovitskii, E. S.*; Chiba, Satoshi; Iwamoto, Osamu; Fukahori, Tokio

JAERI-Research 99-040, 28 Pages, 1999/06

JAERI-Research-99-040.pdf:1.0MB

no abstracts in English

Journal Articles

Long-term contaminant migration and impacts from uranium mill tailings

H.Camus*; R.Little*; D.Acton*; A.Agueero*; D.Chambers*; L.Chamney*; J.L.Daroussin*; J.Droppo*; C.Ferry*; E.Gnanapragasam*; et al.

Journal of Environmental Radioactivity, 42, p.289 - 304, 1999/00

https://doi.org/10.1016/S0265-931X(98)00060-5
 Times Cited Count：19 Percentile：44.72(Environmental Sciences)

no abstracts in English

JAEA Reports

Neutron data evaluation of $$^{238}$$U

V.M.Maslov*; Y.V.Porodzinskij*; Hasegawa, Akira; Shibata, Keiichi

JAERI-Research 98-040, 64 Pages, 1998/08

JAERI-Research-98-040.pdf:2.45MB

no abstracts in English

Journal Articles

Nuclear magnetic moment of the first excited state (I=2$$^{+}$$) of $$^{238}$$U

Tsutsui, Satoshi*; Nasu, Saburo*; Nakada, Masami; ; Saeki, Masakatsu; ; ; Nakamura, Akio

Journal of the Physical Society of Japan, 67(8), p.2641 - 2644, 1998/08

https://doi.org/10.1143/JPSJ.67.2641
 Times Cited Count：8 Percentile：53.37(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

First evidence for a new spontaneous fission decay produced in the reaction $$^{30}$$Si + $$^{238}$$U

Ikezoe, Hiroshi; Ikuta, T.*; Mitsuoka, Shinichi; Nagame, Yuichiro; Nishinaka, Ichiro; Tsukada, Kazuaki; Kuzumaki, T.*; J.Lu*;

European Physical Journal A, 2(4), p.379 - 382, 1998/00

https://doi.org/10.1007/s100500050134
 Times Cited Count：10 Percentile：52.39(Physics, Nuclear)

no abstracts in English

Journal Articles

Preparation of source and sealed absorber holder for $$^{237}$$Np and $$^{238}$$U Moessbauer measurements

Nakada, Masami; Saeki, Masakatsu; ; Tsutsui, Satoshi*

Journal of Radioanalytical and Nuclear Chemistry, 232(1-2), p.201 - 207, 1998/00

https://doi.org/10.1007/BF02383740
 Times Cited Count：8 Percentile：56.62(Chemistry, Analytical)

no abstracts in English

Journal Articles

Moessbauer study of uranium compounds

Tsutsui, Satoshi*; Nakada, Masami; Kobayashi, Yasuhiro*; ; Saeki, Masakatsu; Nasu, Saburo*; Nakamura, Akio; Haga, Yoshinori; Homma, Tetsuo*; Yamamoto, Etsuji; et al.

Physics of Strongly Correlated Electron Systems (JJAP Series 11), p.266 - 268, 1998/00

no abstracts in English

50 (Records 1-20 displayed on this page)