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Journal Articles

$$f$$-electron states of heavy-fermion superconductor NpPd$$_5$$Al$$_2$$ and rare-earth- and actinide-based isostructural compounds

Metoki, Naoto

Journal of the Physical Society of Japan, 89(2), p.025001_1 - 025001_2, 2020/02

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

Good correspondence of the $$LS$$ and $$j$$-$$j$$ coupling scheme can be realized in the $$f$$-electron states of the heavy-fermion superconductor NpPd$$_5$$Al$$_2$$ and the isostructural family. The rare-earth and actinide elements are under a common strong uniaxial point charge potential with tetragonal point symmetry $$D_{4h}$$. The systematic development of the $$f$$-electron states can be understood in the $$LS$$ coupling scheme of $$^nf$$ configuration (the number of $$f$$ electrons $$nleq6$$). We can find the corresponding states in $$j$$-$$j$$ coupling scheme with three $$f$$-orbitals $$Gamma_7^{rm; i}, Gamma_7^{rm; ii}$$, and $$Gamma_6$$ determined from CePd$$_5$$Al$$_2$$ with $$^1f$$ configuration.

JAEA Reports

Development of the versatile reactor analysis code system, MARBLE2

Yokoyama, Kenji; Jin, Tomoyuki; Hirai, Yasushi*; Hazama, Taira

JAEA-Data/Code 2015-009, 120 Pages, 2015/07

JAEA-Data-Code-2015-009.pdf:1.93MB

The second version of the versatile reactor analysis code system, MARBLE2, has been developed. A lot of new functions have been added inMARBLE2 by using the base technology developed in the first version (MARBLE1). Introducing the remaining functions of the conventional code system (JOINT-FR and SAGEP-FR), MARBLE2 enables one to execute almost all analysis functions of the conventional code system with the unified user interfaces of its subsystem, SCHEME. In particular, the sensitivity analysis functionality is available in MARBLE2. On the other hand, new built-in solvers have been developed, and existing ones have been upgraded. Furthermore, some other analysis codes and libraries developed in JAEA have been consolidated and prepared in SCHEME. In addition, several analysis codes developed in the other institutes have been additionally introduced as plug-in solvers. Consequently, $$gamma$$-ray transport calculation and heating evaluation become available. As for another subsystem, ORPHEUS, various functionality updates and speed-up techniques have been applied based on user experience of MARBLE1 to enhance its usability.

Journal Articles

Multipole ordering in $$f$$-electron systems

Kubo, Katsunori; Hotta, Takashi

Physica B; Condensed Matter, 378-380, p.1081 - 1082, 2006/05

 Times Cited Count:3 Percentile:18.82(Physics, Condensed Matter)

In order to investigate multipole ordering in $$f$$-electron systems from a microscopic viewpoint, we study the so-called $$Gamma_8$$ models on three kinds of lattices, simple cubic (sc), bcc, and fcc, based on a $$j$$-$$j$$ coupling scheme with $$f$$-electron hopping integrals through $$(ffsigma)$$ bonding. From the $$Gamma_8$$ model, we derive an effective model for each lattice structure by using the second-order perturbation theory with respect to $$(ffsigma)$$. By further applying mean-field theory to the effective model, we find a $$Gamma_{3g}$$ antiferro-quadrupole transition for the sc lattice, a $$Gamma_{2u}$$ antiferro-octupole transition for the bcc lattice, and a longitudinal triple-$$q$$ $$Gamma_{5u}$$ octupole transition for the fcc lattice.

Journal Articles

Multipole ordering in $$f$$-electron systems on the basis of a $$j$$-$$j$$ coupling scheme

Kubo, Katsunori; Hotta, Takashi

Physical Review B, 72(14), p.144401_1 - 144401_12, 2005/10

 Times Cited Count:30 Percentile:74.41(Materials Science, Multidisciplinary)

We investigate microscopic aspects of multipole ordering in $$f$$-electron systems with emphasis on the effect of lattice structure. For the purpose, we construct $$f$$-electron models on three kinds of lattices, simple cubic (sc), bcc, and fcc, in a tight-binding approximation on the basis of a $$j$$-$$j$$ coupling scheme. Then, an effective model is derived in the strong-coupling limit for each lattice with the use of second-order perturbation theory with respect to $$(ffsigma)$$. By applying mean-field theory to such effective models, we find multipole ordered states depending on the lattice structure. For the sc lattice, a $$Gamma_{3g}$$ antiferro-quadrupole transition occurs at a finite temperature and at further lowering temperature, we find another transition to a ferromagnetic state. For the bcc lattice, a $$Gamma_{2u}$$ antiferro-octupole ordering occurs first, and then, a ferromagnetic phase transition follows it. Finally, for the fcc lattice, we find a single phase transition to the longitudinal triple-$$q$$ $$Gamma_{5u}$$ octupole ordering.

Journal Articles

Analysis of $$f$$-$$p$$ model for octupole ordering in NpO$$_2$$

Kubo, Katsunori; Hotta, Takashi

Physical Review B, 72(13), p.132411_1 - 132411_4, 2005/10

 Times Cited Count:36 Percentile:78.51(Materials Science, Multidisciplinary)

In order to examine the origin of octupole ordering in NpO$$_2$$, we propose a microscopic model constituted of neptunium $$5f$$ and oxygen $$2p$$ orbitals. To study multipole ordering, we derive effective multipole interactions from the $$f$$-$$p$$ model by using the fourth-order perturbation theory in terms of $$p$$-$$f$$ hopping integrals. Analyzing the effective model numerically, we find a tendency toward $$Gamma_{5u}$$ antiferro-octupole ordering.

Journal Articles

$$beta$$-decay half-lives of new neutron-rich rare-earth isotopes $$^{159}$$Pm, $$^{162}$$Sm, and $$^{166}$$Gd

Ichikawa, Shinichi; Asai, Masato; Tsukada, Kazuaki; Haba, Hiromitsu*; Nagame, Yuichiro; Shibata, Michihiro*; Sakama, Minoru*; Kojima, Yasuaki*

Physical Review C, 71(6), p.067302_1 - 067302_4, 2005/06

 Times Cited Count:18 Percentile:75.56(Physics, Nuclear)

The new neutron-rich raer-earth isotopes $$^{159}$$Pm, $$^{162}$$Sm, and $$^{166}$$Gd produced in the proton-induced fission of 238U were identified using the JAERI on-line isotope separator (JAERI-ISOL) coupled to a gas-jet transport sysetm. The half-lives of $$^{159}$$Pm, $$^{162}$$Sm, and $$^{166}$$Gd were determined to be 1.5$$pm$$0.2s, 2.4$$pm$$0.5s, and 4.8$$pm$$1.0s, respectively. The partial decay scheme of $$^{166}$$Gd wes constructed for $$gamma$$-$$gamma$$ coincidence data. The improved half-life values of 25.6$$pm$$2.2s wes obtained for the previously identified isotope $$^{166}$$Tb. The half-lives measured in the present study are in good agreement with the theoretical predictions calculated by the second generation of the gross theory with the atomic masses evaluated by the Audei and Wapstra.

Journal Articles

Microscopic theory of multipole ordering in NpO$$_2$$

Kubo, Katsunori; Hotta, Takashi

Physical Review B, 71(14), p.140404_1 - 140404_4, 2005/04

 Times Cited Count:60 Percentile:87.94(Materials Science, Multidisciplinary)

In order to examine the mysterious ordered phase of NpO$$_2$$ from a microscopic viewpoint, we investigate an $$f$$-electron model on an fcc lattice constructed based on a $$j$$-$$j$$ coupling scheme. First, an effective model with multipole interactions is derived in the strong-coupling limit. Numerical analysis of the model clearly indicates that the interactions for $$Gamma_{4u}$$ and $$Gamma_{5u}$$ moments are relevant to the ground state. Then, by applying mean-field theory to the simplified model including only such interactions, we conclude that longitudinal triple-$$q$$ $$Gamma_{5u}$$ octupole order is realized in NpO$$_2$$ through the combined effects of multipole interactions and anisotropy of the $$Gamma_{5u}$$ moment.

Journal Articles

Flow scheme and controllability of the HTTR hydrogen production system

Nishihara, Tetsuo; Shimizu, Akira; Inagaki, Yoshiyuki; Tanihira, Masanori*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 2(4), p.517 - 524, 2003/12

no abstracts in English

Journal Articles

Validation and sensitivity analysis of a new atmosphere-soil-vegetation model

Nagai, Haruyasu

Journal of Applied Meteorology, 41(2), p.160 - 176, 2002/02

no abstracts in English

JAEA Reports

Variation of radiological consequences under various weather conditions

Liu, X.; Homma, Toshimitsu

JAERI-Tech 2001-054, 49 Pages, 2001/08

JAERI-Tech-2001-054.pdf:1.54MB

no abstracts in English

JAEA Reports

Study on core physics characteristics of high burnup full MOX PWR core, 2

Kugo, Teruhiko; Okubo, Tsutomu; *

JAERI-Research 99-057, p.29 - 0, 1999/09

JAERI-Research-99-057.pdf:1.77MB

no abstracts in English

Journal Articles

High spin states of $$^{132}$$Cs

Hayakawa, Takehito*; J.Lu*; Furuno, Kohei*; *; *; *; Komatsubara, Tetsuro*; Oshima, Masumi; ; *; et al.

Z. Phys., A, 357(4), p.349 - 350, 1997/00

no abstracts in English

Journal Articles

Development of a numerical solution method for advection terms and its application to atmospheric dynamic model, PHYSIC

Yamazawa, Hiromi

Journal of Nuclear Science and Technology, 33(1), p.69 - 77, 1996/01

 Times Cited Count:4 Percentile:40.53(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Numerical analysis for thermal waves in gas generated by impulsive heating of a boundary surface

*; Kunugi, Tomoaki

Therm. Sci. Eng., 4(3), p.1 - 7, 1996/00

no abstracts in English

Journal Articles

Performance of the undulator for JAERI FEL project

Nagai, Ryoji; Kobayashi, Hideki*; Sasaki, Shigemi; Sawamura, Masaru; Sugimoto, Masayoshi; ; Kikuzawa, Nobuhiro; Okubo, Makio; Minehara, Eisuke; *; et al.

Nuclear Instruments and Methods in Physics Research A, 358, p.403 - 406, 1995/00

 Times Cited Count:11 Percentile:73.05(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

Catalog of gamma-rays unplaced in radioactive decay schemes

; Kitao, Kensuke*

JAERI-M 91-037, 332 Pages, 1991/03

JAERI-M-91-037.pdf:28.72MB

no abstracts in English

Journal Articles

Evaluation of automatic ranking scheme in the INIS reference retrieval system

INFORMAT, 1(2), p.201 - 216, 1982/02

no abstracts in English

Journal Articles

Decay of $$^{1}$$$$^{8}$$$$^{9}$$Re

*; ;

Journal of the Physical Society of Japan, 46(4), p.1067 - 1074, 1979/00

 Times Cited Count:5

no abstracts in English

Journal Articles

Nuclear resonant scattering from the 6730-keV level in $$^{1}$$$$^{2}$$$$^{0}$$Sn

Journal of the Physical Society of Japan, 45(4), p.1076 - 1084, 1978/04

 Times Cited Count:1

no abstracts in English

Journal Articles

Photoexcitation of the 7310-keV level in $$^{1}$$$$^{2}$$$$^{0}$$Sn and the 6517-keV level in $$^{1}$$$$^{1}$$$$^{7}$$Sn

Journal of the Physical Society of Japan, 45(4), p.1085 - 1091, 1978/04

 Times Cited Count:0

no abstracts in English

25 (Records 1-20 displayed on this page)