Photoneutron emission process on nuclei around A = 200 for giant dipole resonance energies based on neutron energy and angular distribution

Nguyen, T. H. T.; Sanami, Toshiya*; Yamazaki, Hirohito*; Iwamoto, Nobuyuki; Itoga, Toshiro*; Kirihara, Yoichi; Lee, E.*; Sugihara, Kenta*; Miyamoto, Shuji*; Hashimoto, Satoshi*; et al.

Physics Letters B, 870, p.139900_1 - 139900_8, 2025/11

https://doi.org/10.1016/j.physletb.2025.139900

JENDL photonuclear data file 2016 revision 1

Iwamoto, Nobuyuki

Journal of Nuclear Science and Technology, 13 Pages, 2025/10

https://doi.org/10.1080/00223131.2025.2573658

Circular polarization measurement of -rays emitted from S(n,)S reaction with polarized neutrons

Endo, Shunsuke; Fujioka, Hiroyuki*; Ide, Ikuo*; Iinuma, Masataka*; Iwamoto, Nobuyuki; Iwamoto, Osamu; Kameda, Kento*; Kawamura, Shiori*; Kimura, Atsushi; Kitaguchi, Masaaki*; et al.

EPJ Web of Conferences, 329, p.05003_1 - 05003_3, 2025/06

https://doi.org/10.1051/epjconf/202532905003

no abstracts in English

Accurate measurement of the I neutron capture cross-section in the keV neutron region

Rovira Leveroni, G.; Kimura, Atsushi; Nakamura, Shoji; Endo, Shunsuke; Iwamoto, Osamu; Iwamoto, Nobuyuki; Katabuchi, Tatsuya*

Journal of Nuclear Science and Technology, 12 Pages, 2025/00

https://doi.org/10.1080/00223131.2025.2543579

Neutron total and capture cross section measurements of Er at ANNRI

Rovira Leveroni, G.; Kimura, Atsushi; Nakamura, Shoji; Endo, Shunsuke; Iwamoto, Osamu; Iwamoto, Nobuyuki; Katabuchi, Tatsuya*

JAEA-Conf 2024-002, p.127 - 132, 2024/11

https://doi.org/10.11484/jaea-conf-2024-002

Report on the 36th Meeting of Working Party on International Nuclear Data Evaluation Co-operation (WPEC) of NEA

Iwamoto, Osamu; Iwamoto, Nobuyuki; Tada, Kenichi; Katabuchi, Tatsuya*

Kaku Deta Nyusu (Internet), (139), p.1 - 7, 2024/10

no abstracts in English

Neutron capture cross section measurement of I and 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

https://doi.org/10.1140/epja/s10050-024-01333-3

Evaluation of the production amount of Ac and its uncertainty through the Ra(n,2n) reaction in the experimental fast reactor Joyo

Sasaki, Yuto*; Sano, Aaru; Sasaki, Shinji; Iwamoto, Nobuyuki; Ouchi, Kazuki; Kitatsuji, Yoshihiro; Takaki, Naoyuki*; Maeda, Shigetaka

Journal of Nuclear Science and Technology, 61(4), p.509 - 520, 2024/04

https://doi.org/10.1080/00223131.2023.2243941

Ac is attracting attention as an alpha-emitting medical radioisotope. Since its demand is expected to increase, domestic production of Ac is required from the viewpoint of Japan's medical research and economic security. To establish the technical bases for the Ac production, JAEA has evaluated the radioactivity that can be produced in the experimental fast reactor Joyo and designed the concept that upgrades the existing facilities for transporting the irradiated target from Joyo to a neighboring PIE facility rapidly. Efficient Ac Separation from Ra irradiated in a fast reactor was studied. Ba and La were used as alternatives to Ra and Ac, respectively. By using DGA resin as an adsorbent, it can be expected that Ra and impurities generated by irradiation will be removed and Ac will be isolated. This study has revealed that Joyo can sufficiently produce Ac as a raw material for pharmaceuticals.

Neutron capture cross section measurement of I and 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

https://doi.org/10.11484/jaea-conf-2023-001

Status of the Ra nuclear data library and its impact on the production amount of Ac via the Ra (n,2n) reaction

Sasaki, Yuto; Iwamoto, Nobuyuki; Takaki, Naoyuki*; Maeda, Shigetaka

Journal of Nuclear Science and Technology, 61(2), p.251 - 260, 2024/02

https://doi.org/10.1080/00223131.2023.2295018

Ac is a promising alpha emitter for targeted alpha therapy. However, the current capability of Ac supply is limited to approximately 63 GBq/y, primarily relying on the natural source of Th stocked at a few institutes. Therefore, alternative Ac production methods are highly desired. The research and development of Ac and its parent nuclide production methods using accelerators and reactors to target Ra and Th are actively pursued worldwide. Hence, the authors focused on the Ra(n,2n) Ra method using fast neutron spectra as an application of the experimental fast reactor Joyo. This study investigated the status of nuclear data libraries for Ra, an essential target for Ac production, and evaluated the impact of different nuclear data libraries on the amount of Ac produced. Consequently, cross-sections with covariance data were stored in TENDL-2021, JEFF-3.3, and EAF-2010 but not in ENDF or JENDL, the major nuclear data libraries. Furthermore, no consistency occurred among the respective nuclear data, and the Ra production amount varied.