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Search Results: Records 1-20 displayed on this page of 31

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Journal Articles

Measurements of EC and weak decays of neutron-deficient transuranium isotopes

Asai, Masato; Sakama, Minoru; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi; Kojima, Yasuaki*; Oura, Yasuji*; et al.

Journal of Nuclear Science and Technology, 39(Suppl.2), p.474 - 477, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/1_0474.pdf

Neutron-deficient americium and curium isotopes with half-lives 10 min have been produced with the tandem accelerator, and their EC and weak decays have been successfully measured through an on-line isotope separation. Decay schemes of $^{235,236}$ Am have been established, and proton-neutron configurations in the parent and daughter nuclei have been determined. Observed transitions in $^{233,235}$ Am were found to be the favored transitions between the $pi 5/2^{-}[523]$ Nilsson states. Information on nuclear structure, deformation, and atomic masses in this region were obtained.

Journal Articles

Analysis of absorbed dose to tooth enamel for ESR dosimetry

Takahashi, Fumiaki; Yamaguchi, Yasuhiro; Saito, Kimiaki; Iwasaki, Midori*; Miyazawa, Chuzo*; Hamada, Tatsuji*; Funabiki, Jun*

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1314 - 1317, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/2_1314.pdf

An analysis of dose to tooth enamel was carried out to develop a method that can predict the organdose and effective dose by the Electron Spin Resonance (ESR) dosimetry using teeth for external photon exposure. Absorbed dose to tooth enamel were obtained with Monte Carlo calculations using EGS4 code with a mathematical human model, which has a newly defined teeth-part. Experiments were also carried out to investigate the dose at the tooth area with a physical head phantom. The calculated doses to tooth enamel were, however, less than the measured doses with the TLDs for the case of photon incidence from the back of a human body. Then, a computational human model, called a “Voxel (Volume-pixel) type" phantom was constructed based upon a computed topography (CT) image of the physical head phantom used in the experiments.The additional Monte Carlo calculations were performed to verify the results in the experiments with the EGS4 in conjunction with user's code UCPIXEL and the Voxel type phantom.

Journal Articles

Development of SCINFUL-CG code to calculate response function of hybrid neutron detectors using scintillators

Kim, E.; Endo, Akira; Yamaguchi, Yasuhiro

Journal of Nuclear Science and Technology, 39(Suppl.2), p.693 - 696, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/1_0693.pdf

no abstracts in English

Journal Articles

Reassessment of nuclear decay database used for dose calculation

Endo, Akira; Yamaguchi, Yasuhiro

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1433 - 1436, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/2_1433.pdf

no abstracts in English

Journal Articles

Magnetic shift of magic nuclei

Kondratyev, V. N.

Journal of Nuclear Science and Technology, 39(Suppl.2), p.550 - 553, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/1_0550.pdf

As we have recently proposed study magnetic fields can modify dramatically the nuclear structure leading, e.g., to a change of shell-correction components of binding energies and nuclear magic numbers. In this contribution we further demonstrate that the predominant mechanism of such a modification can be interpreted as a phase-shift in shell-oscillations originating from a field dependent interference of contributions coming from majority- and minority-spin energy levels. Nuclear magic numbers corresponding to the vicinity of the stability line depend on the magnetic field and are changed considerably at the strength scale $Bsim 10^{16} - 10^{17}$ G relevant, e.g., for supernovas and neutron stars. At such a field strength the magic nuclei of the iron region are shifted towards smaller mass numbers.

Journal Articles

Evaluation of Delayed Neutron Data for JENDL-3.3

Yoshida, Tadashi*; Okajima, Shigeaki; Sakurai, Takeshi; Nakajima, Ken; Yamane, Tsuyoshi; Katakura, Junichi; Tahara, Yoshihisa*; Zukeran, Atsushi*; Oyamatsu, Kazuhiro*; Osawa, Takaaki*; et al.

Journal of Nuclear Science and Technology, 39(Suppl.2), p.136 - 139, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/1_0136.pdf

no abstracts in English

Journal Articles

Soft-rotator model and coupled-channels approach for consistent description of the nuclear collective levels and their excitation by nucleons

Soukhovitskij, E. Sh.*; Chiba, Satoshi

Journal of Nuclear Science and Technology, 39(Suppl.2), p.697 - 702, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/1_0697.pdf

Coupled-channels optical model approach built on the wave functions of the soft-rotator nuclear Hamiltonian is applied for the self-consistent analyses of the low-lying collective nuclear level structure and nucleon interaction with even-even nuclei in a wide - mass region. It succeeds to describe available experimental data and - transitions with reasonable accuracy. Along with the account of the global optical potential form and relativistic kinematics, present method was proved to be a powerful tool for studies of nucleon-induced reaction data.

Journal Articles

Calculation of fission reaction in the framework of QMD + SDM

Iwamoto, Osamu; Rong, J.; Fukahori, Tokio; Chiba, Satoshi

Journal of Nuclear Science and Technology, 39(Suppl.2), p.128 - 131, 2002/08

https://doi.org/10.1080/00223131.2002.10875057

The nucleon induced fission cross section and the fragment distribution are calculated using the Quantum Molecular Dynamics (QMD) plus Statistical Decay Model (SDM) in the nucleon energy range 10 MeV to 10 GeV. The fission cross section is calculated for $^{197}$ Au, $^{209}$ Bi and $^{238}$ U and compared with experiments. The calculation predicts fairly well the experimental values. The mass and charge distribution is calculated for $^{208}$ Pb and $^{232}$ Th at 1.6-GeV and 190-MeV proton incident energy, respectively.

Journal Articles

Fusion power measurement based on $^{16}$ O(n,p) $^{16}$ N reaction in flowing water

Nishitani, Takeo; Uno, Yoshitomo; Kaneko, Junichi*; Ochiai, Kentaro; Maekawa, Fujio

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1139 - 1142, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/2_1139.pdf

no abstracts in English

Journal Articles

Excitation functions of rhenium isotopes on the $^{nat.}$ W(d,xn) reactions and production of no-carrier-added $^{186}$ Re

Ishioka, Noriko; Watanabe, Satoshi; Osa, Akihiko; Koizumi, Mitsuo; Matsuoka, Hiromitsu; Sekine, Toshiaki

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1334 - 1337, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/2_1334.pdf

Experimental cross sections for the reactions $^{186}$ W(d,2n) $^{186}$ Re, $^{nat.}$ W(d,xn) $^{181-184}$ Re and $^{186}$ W(d,p) $^{187}$ W are measured up to 34 MeV using the stacked foil method. The values obtained are compared with cross sections calculated using the ALICE code. The experimental and theoretical excitation functions are in reasonable agreement except for the $^{186}$ W(d,p) $^{187}$ W reaction.

Journal Articles

MATXS files processed from JENDL-3.2 and -3.3 for shielding

Konno, Chikara; Ikeda, Yujiro

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1037 - 1040, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/2_1037.pdf

no abstracts in English

Journal Articles

ACE and MATXS files processed from JENDL high energy file

Konno, Chikara; Ikeda, Yujiro

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1041 - 1044, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/2_1041.pdf

no abstracts in English

Journal Articles

Benchmark and MC sensitivity/uncertainty analyses of FNS beryllium and iron TOF experiments and IPPE nickel TOF experiment using EFF-3 data

Konno, Chikara; Fischer, U.*; Perel, R.*

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1045 - 1048, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/2_1045.pdf

no abstracts in English

Journal Articles

Evaluation of radioactivity at accelerator tunnels for high-intensity proton accelerator facility

Nakane, Yoshihiro; Masukawa, Fumihiro; Oguri, Tomomi*; Nakashima, Hiroshi; Abe, Teruo*; Sasamoto, Nobuo

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1260 - 1263, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/2_1260.pdf

no abstracts in English

Journal Articles

A Neutronics and burnup analysis of the accelerator-driven transmutation system with different cross section libraries

Sasa, Toshinobu; Tsujimoto, Kazufumi; Kaneko, Kunio*; Takano, Hideki

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1183 - 1186, 2002/08

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875313

no abstracts in English

Journal Articles

Status on shielding design study for the high-intensity proton accelerator facility

Sasamoto, Nobuo; Nakashima, Hiroshi; Hirayama, Hideo*; Shibata, Tokushi*

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1264 - 1267, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/2_1264.pdf

no abstracts in English

Journal Articles

Neutronics experiment of $^{6}$ Li-enriched breeding blanket with Li $_{2}$ TiO $_{3}$ /Be/F82H assembly using D-T neutrons

Ochiai, Kentaro; Klix, A.; Hori, Junichi; Morimoto, Yuichi*; Wada, Masayuki*; Nishitani, Takeo

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1147 - 1150, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/2_1147.pdf

Thermal blanket type as one of conceptual designs for DEMO-fusion blanket is proposed. We have irradiated the trial blanket assembly which was stratified 95-% enriched Li2TiO3,F82H and beryllium block using Fusion Neutron Source (FNS) and verified the accuracy of these parameters by measurements of tritium and gamma-ray emitted from samples of95-% enriched Li2TiO3 and F82H. We have used the liquid scintillated counter as the method of tritium measurement. Activation foils, NE213, Si-SBD and Fission chamber have usedto measure neutron fluence. Moreover, we have concurrently measured the gamma rays of 56Mn, 54Mn, 187W and 51Cr was produced by 56Fe(n,p), 54Fe(n,p), 186W(n,g), 52Cr(n,2n) and 50Cr(n,g) in F82H. We have used the JENDL Fusion File library and MCNP to verify the accuracy tritium-production rate and 56Mn, 54Mn, 187W and 51Cr. From the results of above experiments, MCNP that uses the JENDL-FF nuclear data library can predict the nuclear parameters such as TPR, Nb, 56Mn, In and 54Mn in the test assemblies within an accuracy of 10%.

Journal Articles

Research activities on neutronics under ASTE collaboration at AGS/BNL

Nakashima, Hiroshi; Takada, Hiroshi; Kasugai, Yoshimi; Meigo, Shinichiro; Maekawa, Fujio; Kai, Tetsuya; Konno, Chikara; Ikeda, Yujiro; Oyama, Yukio; Watanabe, Noboru; et al.

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1155 - 1160, 2002/08

https://doi.org/10.1080/00223131.2002.10875307

no abstracts in English

Journal Articles