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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

 Times Cited Count:71 Percentile:10.02(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

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

 Times Cited Count:5 Percentile:63.15(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 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

 Times Cited Count:6 Percentile:60.66

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

 Times Cited Count:3 Percentile:76.9(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

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

 Times Cited Count:0 Percentile:100(Chemistry, Inorganic & Nuclear)

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

 Times Cited Count:16 Percentile:56.77(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

 Times Cited Count:8 Percentile:45.05(Physics, Multidisciplinary)

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

 Times Cited Count:8 Percentile:40.69(Chemistry, Analytical)

no abstracts in English

Journal Articles

Application of selective phase extraction techniques in evaluation of contaminated sites

T.E.Payne*; Yanase, Nobuyuki

Radiological Aspects of the Rehabilitation of Contaminated Sites, p.79 - 85, 1998/00

no abstracts in English

JAEA Reports

Estimation of uncertainties in resonance parameters of $$^{56}$$Fe,$$^{239}$$Pu,$$^{240}$$Pu and $$^{238}$$U

Nakagawa, Tsuneo; Shibata, Keiichi

JAERI-Research 97-035, 79 Pages, 1997/05

JAERI-Research-97-035.pdf:3.57MB

no abstracts in English

Journal Articles

High temperature Doppler effect experiment for $$^{238}$$U at FCA, II; Reaction rate measurement up to 2000$$^{circ}$$C with a foil heated by laser exposure

Okajima, Shigeaki; Oigawa, Hiroyuki; Ando, Masaki; Mukaiyama, Takehiko

Journal of Nuclear Science and Technology, 34(1), p.13 - 20, 1997/01

 Times Cited Count:2 Percentile:75.44(Nuclear Science & Technology)

no abstracts in English

Journal Articles

High temperature Doppler effect experiment for $$^{238}$$U at FCA, I; Reactivity worth measurement with a small heated sample up to 1500$$^{circ}$$C

Okajima, Shigeaki; Oigawa, Hiroyuki; Mukaiyama, Takehiko; Ando, Masaki

Journal of Nuclear Science and Technology, 33(3), p.202 - 210, 1996/03

 Times Cited Count:3 Percentile:65.7(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Modified conversion ratio measurement in light water-moderated UO$$_{2}$$ lattices

Nakajima, Ken;

Nuclear Technology, 113, p.375 - 379, 1996/03

 Times Cited Count:5 Percentile:53.29(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Doppler effect measurement up to 2,000$$^{circ}$$C in the fast critical facility FCA

Okajima, Shigeaki; Oigawa, Hiroyuki; Ando, Masaki; Mukaiyama, Takehiko

Proc. of 9th Int. Symp. on Reactor Dosimetry, 0, p.172 - 179, 1996/00

no abstracts in English

30 (Records 1-20 displayed on this page)