VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 54 (2021)

Nuclear Science and Transmutation Research Division
Nuclear Transmutation Data Research Group
Fast RI Data Team
1. Abstract

Fast RI team aims at obtaining and accumulating the cross section data for long lived fission products (LLFPs) in order to explore
the possibility of using accelerator for nuclear transmutation.
LLFPs as nuclear waste have been generated continuously in nuclear power plants for wealth for human lives, while people
noticed the way of disposal has not necessarily been established, especially after the Fukushima Daiichi power plant disaster. One ofthe ways to reduce the amount of LLFP or to recover them as recycled resources is nuclear transmutation technique.
RIBF facility has a property to generate such LLFP as a secondary beam and the beam species are identified by event by event.
Utilizing the property, absolute values of the cross section of various reactions on LLFPs are measured and accumulated as a database.

2. Major Research Subjects(1) Measurement of reaction products by the interaction of LLFPs with proton, deuteron, and photon to explore candidate reactions for the transmutation of LLFPs.
(2) Evaluation of the cross section data for the neutron induced reactions from the obtained data.

3. Summary of Research Activity
(1)
(2)
(3)
(4)

Acting as a collaboration hub on many groups which plan to take data using fast RI beams in RIBF facility.
Concentrating on taking data for proton and deuteron induced spallation reactions with inverse kinematics.
Accumulating the cross section data and evaluating them as evaluated nuclear data.
Evaluating cross section of neutron induced reaction on LLFP by collaborating with the nuclear model calculation and evaluation group.

Members
Team Leader
Hideaki OTSU (Concurrent: Team Leader, SAMURAI Team)
Visiting Scientist
Takashi TERANISHI (Kyushu Univ.)
Student Trainee
Koichi GOTO (Kyushu Univ.)

List of Publications & Presentations
Publications[Original Papers]
X. H. Sun, H. Wang, H. Otsu, H. Sakurai, et al., “Spallation and fragmentation cross sections for 168 MeV/nucleon 136 Xe ions on proton,deuteron, and carbon targets,” Phys. Rev. C 101, 064623 (2020).

[Proceedings]
H. Wang, H. Otsu, H. Sakurai, et al., “Spallation reaction study for long-lived fission products in nuclear waste,” EPJ Web Conf. 239,06003 (2020) (Proc. International Conference on Nuclear Data for Science and Technology (ND2019), Beijing, China, May 19–24,2019).
K. Nakano, Y. Watanabe, S. Kawase, et al., “Isotope-production cross sections of residual nuclei in proton- and deuteron-induced reactions
on 93 Zr at 50 MeV/nucleon,” EPJ Web Conf. 239, 20006 (2020) (Proc. International Conference on Nuclear Data for Science andTechnology (ND2019), Beijing, China, May 19–24, 2019).
X. Sun, H. Wang, H. Otsu, H. Sakurai, et al., “Cross-section measurement in the reactions of 136 Xe on proton, deuteron and carbon” EPJ
Web Conf. 239, 01037 (2020) (Proc. International Conference on Nuclear Data for Science and Technology (ND2019), Beijing, China,
May 19–24, 2019).

Presentations[International Conferences/Workshops]
R. Matsumura, H. Otsu, H. Wang, N. Chiga, et al., “Nuclear transmutation of high-radiotoxic nuclide 90 Sr via proton- and deuteroninduced reactions in inverse kinematics,” A3F-CNS Summer School 2020, online, August 17–21, 2020.

[Domestic Conferences/Workshops]- 248 -VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 54 (2021)

松村理久, 大津秀暁, 王赫, 千賀信幸, 他 ImPACT-RIBF Collaboration, 「核分裂生成核種 90 Sr の陽子及び重陽子誘起反応に関する研究」, 日本物理学会第 75 回年次大会, 愛知県名古屋市 (名古屋大学現地開催中止), 2020 年 3 月 16–19 日.
松村理久, 大津秀暁, 王赫, 千賀信幸, 他 ImPACT-RIBF Collaboration, 「高放射性核種 90 Sr の陽子及び重陽子誘起反応による核変換に向けた研究」, Symposium on Nuclear Data 2020, 埼玉県和光市, 2020 年 11 月 26–27 日.

- 249 -