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Journal Articles

Measurements of neutron capture cross-section for nuclides of interest in decommissioning (II); $$^{58}$$Fe(n,$$gamma$$)$$^{59}$$Fe

Nakamura, Shoji; Shibahara, Yuji*; Endo, Shunsuke; Rovira Leveroni, G.; Kimura, Atsushi

Journal of Nuclear Science and Technology, 62(3), p.300 - 307, 2025/03

 Times Cited Count:0 Percentile:0.00(Nuclear Science & Technology)

Journal Articles

Transverse asymmetry of individual $$gamma$$ rays in the $$^{139}$$La($$overrightarrow{n},gamma$$)$$^{140}$$La reaction

Okuizumi, Mao*; Auton, C. J.*; Endo, Shunsuke; Fujioka, Hiroyuki*; Hirota, Katsuya*; Ino, Takashi*; Ishizaki, Kohei*; Kimura, Atsushi; Kitaguchi, Masaaki*; Koga, Jun*; et al.

Physical Review C, 111(3), p.034611_1 - 034611_6, 2025/03

Journal Articles

Measurements of neutron capture cross-section for nuclides of interest in decommissioning (III); $$^{170}$$Er(n,$$gamma$$)$$^{171}$$Er and $$^{180}$$Hf(n,$$gamma$$)$$^{181}$$Hf reactions

Nakamura, Shoji; Shibahara, Yuji*; Endo, Shunsuke; Rovira Leveroni, G.; Kimura, Atsushi

Journal of Nuclear Science and Technology, 14 Pages, 2025/00

 Times Cited Count:0 Percentile:0.00(Nuclear Science & Technology)

Journal Articles

Measurements of neutron capture cross-sections for nuclides of interest in decommissioning; $$^{45}$$Sc, $$^{63}$$Cu, $$^{64}$$Zn, $$^{109}$$Ag, and $$^{113}$$In

Nakamura, Shoji; Shibahara, Yuji*; Endo, Shunsuke; Rovira Leveroni, G.; Kimura, Atsushi

Journal of Nuclear Science and Technology, 61(11), p.1415 - 1430, 2024/11

 Times Cited Count:1 Percentile:68.64(Nuclear Science & Technology)

Neutron capture cross-sections of nuclides targeted for decommissioning are necessary to contribute to the evaluation of radioactivity produced. The present study, $$^{45}$$Sc, $$^{63}$$Cu, $$^{65}$$Zn, $$^{109}$$Ag and $$^{113}$$In nuclides were selected as target ones, and their thermal-neutron capture cross-sections were measured by an activation method at Kyoto University Research Reactor. The thermal-neutron capture cross-sections were obtained as follows: 27.18$$pm$$0.28 barn for $$^{45}$$Sc(n, $$gamma$$)$$^{46}$$Sc, 4.34$$pm$$0.06 barn for $$^{63}$$Cu(n, $$gamma$$)$$^{64}$$Cu, 0.719$$pm$$0.011 barn for $$^{64}$$Zn(n, $$gamma$$)$$^{65}$$Zn, 4.05$$pm$$0.05 barn for $$^{109}$$Ag(n, $$gamma$$)$$^{rm 110m}$$Ag and 8.53$$pm$$0.27 barn for $$^{113}$$In(n, $$gamma$$) $$^{114}$$In$$^{m1+m2}$$. The results for $$^{45}$$Sc and $$^{64}$$Zn nuclides supported evaluated values within the limits of uncertainties, while those for the other nuclides were slightly different from evaluated ones. The obtained results are useful not only for the evaluation of production amount, but also for the monitor selection other than Au and Co by considering those nuclides as flux monitors.

Journal Articles

Circular polarization measurement for individual gamma rays in capture reactions with intense pulsed neutrons

Endo, Shunsuke; Abe, Ryota*; Fujioka, Hiroyuki*; Ino, Takashi*; Iwamoto, Osamu; Iwamoto, Nobuyuki; Kawamura, Shiori*; Kimura, Atsushi; Kitaguchi, Masaaki*; Kobayashi, Ryuju*; et al.

European Physical Journal A, 60(8), p.166_1 - 166_10, 2024/08

 Times Cited Count:0 Percentile:0.00(Physics, Nuclear)

Journal Articles

Neutron capture cross-section measurements at TC-Pn in KUR for nuclides of concern in decommissioning

Nakamura, Shoji; Endo, Shunsuke; Rovira Leveroni, G.; Kimura, Atsushi; Shibahara, Yuji*

KURNS Progress Report 2023, P. 46, 2024/07

The present work is an attempt to measure the thermal-neutron capture cross-sections for some nuclides which are of importance in decommissioning to evaluate produced radioactivity. This work selected some of objective nuclides for decommissioning, such as $$^{58}$$Fe, $$^{170}$$Er and $$^{180}$$Hf, and measured thermal-neutron capture cross-sections for these nuclides by a neutron activation method at Kyoto University Research Reactor. The present results were obtained as follows:1.23$$pm$$0.03 barn for $$^{58}$$Fe(n,$$gamma$$)$$^{59}$$Fe reaction, 8.19$$pm$$0.35 barn for $$^{170}$$Er(n,$$gamma$$)$$^{171}$$Er reaction and 13.57$$pm$$0.14 barn for $$^{180}$$Hf(n,$$gamma$$)$$^{181}$$Hf reaction. As a by-product, the measurement of Hf sample also presented 0.427$$pm$$0.006 barn for $$^{179}$$Hf(n,$$gamma$$)$$^{180}$$mHf reaction. It has been revealed that the data adopted in an evaluated data library differ from the present results by more than experimental uncertainties.

Journal Articles

Pushing the high count rate limits of scintillation detectors for challenging neutron-capture experiments

Balibrea-Correa, J.*; Kimura, Atsushi; 133of others*

Nuclear Instruments and Methods in Physics Research A, 1064, p.169385_1 - 169385_13, 2024/07

 Times Cited Count:2 Percentile:68.69(Instruments & Instrumentation)

Journal Articles

Shedding light on the origin of $$^{204}$$Pb, the heaviest $$s$$-process; Only isotope in the solar system

Casanovas-Hoste, A.*; Harada, Hideo; Kimura, Atsushi; 130 of others*

Physical Review Letters, 133(5), p.052702_1 - 052702_8, 2024/07

 Times Cited Count:1 Percentile:58.36(Physics, Multidisciplinary)

Journal Articles

Neutron capture cross section measurement of $$^{129}$$I and $$^{127}$$I using the NaI(Tl) spectrometer of the ANNRI beamline at J-PARC

Rovira Leveroni, G.; Kimura, Atsushi; Nakamura, Shoji; Endo, Shunsuke; Iwamoto, Osamu; Iwamoto, Nobuyuki; Toh, Yosuke; Segawa, Mariko; Maeda, Makoto; Katabuchi, Tatsuya*

European Physical Journal A, 60(5), p.120_1 - 120_14, 2024/05

 Times Cited Count:0 Percentile:0.00(Physics, Nuclear)

Journal Articles

Evaluation of thermal neutron scattering law of nuclear-grade isotropic graphite

Nakayama, Shinsuke; Iwamoto, Osamu; Kimura, Atsushi

EPJ Web of Conferences, 294, p.07001_1 - 07001_6, 2024/04

Graphite is a candidate of moderator in innovative nuclear reactors such as molten salt reactors. Scattering of thermal neutrons by the moderator material has a significant impact on the reactor core design. To contribute to the development of innovative nuclear reactors, an evaluation method of thermal neutron scattering law for reactor grade graphite was studied. The inelastic scattering component due to lattice vibration was evaluated based on the phonon density of states computed with first-principles lattice dynamics simulations. The simulations were performed for ideal crystalline graphite. The coherent elastic scattering component due to crystal structure was evaluated based on neutron transmission and scattering experiments recently performed in the J-PARC/MLF facility. In comparison with the neutron transmission experiments, it was found that the quantification of small-angle neutron scattering due to structures larger than crystal, such as pores in graphite, is important. Based on the above methods, thermal neutron scattering law data for reactor-grade graphite at room temperature were evaluated.

Journal Articles

Total and double differential scattering cross-section measurements of isotropic graphite

Kimura, Atsushi; Endo, Shunsuke; Nakamura, Shoji

EPJ Web of Conferences, 294, p.01002_1 - 01002_7, 2024/04

Journal Articles

$$^{241}$$Am neutron capture cross section measurement using the NaI(Tl) spectrometer of the ANNRI beamline of J-PARC

Rovira Leveroni, G.; Kimura, Atsushi; Nakamura, Shoji; Endo, Shunsuke; Iwamoto, Osamu; Iwamoto, Nobuyuki; Katabuchi, Tatsuya*; Kodama, Yu*; Nakano, Hideto*; Sato, Yaoki*

Journal of Nuclear Science and Technology, 61(4), p.459 - 477, 2024/04

 Times Cited Count:1 Percentile:30.19(Nuclear Science & Technology)

Journal Articles

Measurements of the neutron total and capture cross sections and derivation of the resonance parameters of $$^{181}$$Ta

Endo, Shunsuke; Kimura, Atsushi; Nakamura, Shoji; Iwamoto, Osamu; Iwamoto, Nobuyuki; Rovira Leveroni, G.; Toh, Yosuke; Segawa, Mariko; Maeda, Makoto

Nuclear Science and Engineering, 198(4), p.786 - 803, 2024/04

 Times Cited Count:1 Percentile:30.19(Nuclear Science & Technology)

Journal Articles

High sensitivity of a future search for effects of $$P$$-odd/$$T$$-odd interactions on the 0.75 eV $$p$$-wave resonance in $$overrightarrow{n}$$+$$^{139}overrightarrow{textrm{La}}$$ forward transmission determined using a pulsed neutron beam

Nakabe, Rintaro*; Auton, C. J.*; Endo, Shunsuke; Fujioka, Hiroyuki*; Gudkov, V.*; Hirota, Katsuya*; Ide, Ikuo*; Ino, Takashi*; Ishikado, Motoyuki*; Kambara, Wataru*; et al.

Physical Review C, 109(4), p.L041602_1 - L041602_4, 2024/04

 Times Cited Count:0 Percentile:0.00(Physics, Nuclear)

Journal Articles

A Segmented Total Energy Detector (sTED) optimized for (n,$$gamma$$) cross-section measurements at n_TOF EAR2

Alcayne, V.*; Kimura, Atsushi; 134 of others*

Radiation Physics and Chemistry, 217, p.111525_1 - 111525_11, 2024/04

 Times Cited Count:5 Percentile:97.67(Chemistry, Physical)

Journal Articles

Measurement of the prompt fission $$gamma$$-rays from slow neutron-induced fission of $$^{235}$$U with STEFF

Wright, T.*; Harada, Hideo; Kimura, Atsushi; 121 of others*

European Physical Journal A, 60(3), p.70_1 - 70_11, 2024/03

 Times Cited Count:0 Percentile:0.00(Physics, Nuclear)

Journal Articles

Measurement of the $$^{140}$$Ce(n, $$gamma$$) cross section at n_TOF and its astrophysical implications for the chemical evolution of the universe

Amaducci, S.*; Harada, Hideo; Kimura, Atsushi; 130 of others*

Physical Review Letters, 132(12), p.122701_1 - 122701_8, 2024/03

 Times Cited Count:2 Percentile:76.47(Physics, Multidisciplinary)

JAEA Reports

Proceedings of the 2022 Symposium on Nuclear Data; November 17-18, 2022, BLOSSOM CAF$'E$, Main Campus, Kindai University, Higashiosaka City, Osaka, Japan

Shigyo, Nobuhiro*; Kimura, Atsushi; Sano, Tadafumi*

JAEA-Conf 2023-001, 146 Pages, 2024/02

JAEA-Conf-2023-001.pdf:11.2MB

The 2022 Symposium on Nuclear Data was held at BLOSSOM CAF$'E$ in Main Campus of Kindai University on November 17-18, 2022. The symposium was organized by the Nuclear Data Division of the Atomic Energy Society of Japan (AESJ) in cooperation with Investigation Committee on Nuclear Data in AESJ, Nuclear Science and Engineering Center of Japan Atomic Energy Agency, and High Energy Accelerator Research Organization. In the symposium, tutorials "The Future of Nuclear Reactor Physics Experimental Research in Japan" was proposed and held. Two sessions of lectures and discussions were held: "Recent Topics on Nuclear Data". In addition, recent research progress on experiments, nuclear theory, evaluation, benchmark, and applications were presented in the poster session. The total number of participants was 76 participants. Each oral and poster presentation was followed by an active question and answer session. This report consists of a total of 22 papers including 4 oral and 18 poster presentations.

Journal Articles

Neutron capture cross section measurement of $$^{129}$$I and $$^{127}$$I using ANNRI at MLF/J-PARC

Rovira Leveroni, G.; Kimura, Atsushi; Nakamura, Shoji; Endo, Shunsuke; Iwamoto, Osamu; Iwamoto, Nobuyuki; Toh, Yosuke; Segawa, Mariko; Maeda, Makoto; Katabuchi, Tatsuya*

JAEA-Conf 2023-001, p.74 - 79, 2024/02

Journal Articles

Measurements of neutron total and capture cross sections of $$^{139}$$La and evaluation of resonance parameters

Endo, Shunsuke; Kawamura, Shiori*; Okudaira, Takuya*; Yoshikawa, Hiromoto*; Rovira Leveroni, G.; Kimura, Atsushi; Nakamura, Shoji; Iwamoto, Osamu; Iwamoto, Nobuyuki

European Physical Journal A, 59(12), p.288_1 - 288_12, 2023/12

 Times Cited Count:1 Percentile:30.87(Physics, Nuclear)

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747 (Records 1-20 displayed on this page)