# Plasma and Fusion Research

## Volume 13, 2405002 (2018)

# Regular Articles

- Department of Sustainable Energy and Environmental Engineering, School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

### Abstract

At 14 MeV, it is known that the absolute value of large angle scattering cross section is small. The contribution is thus thought to be neglected in the neutronics design of fusion reactor. However, in case that a neutron source can be regarded as a beam like a neutron streaming, large angle scattering cross sections might affect the nuclear design result largely. In fact, in fusion neutronics benchmark experiments using a neutron beam so far, there was a difference observed between experiment and simulation. Also it is known that there are differences in large angle scattering cross sections among nuclear data libraries. Then we have been carrying out preliminary benchmark experiments for verification of large angle scattering reaction cross sections of iron for a few years. The purpose of the present study is to optimize the experimental system design to realize an accurate benchmarking of large angle scattering reaction cross sections. Finally, we reached the optimized experimental system and developed the experimental procedure which was supposed to perform more accurate benchmark experiments for large angle scattering reaction cross sections.

### Keywords

nuclear data library, neutron scattering reaction, fusion reactor, shadow bar, fusion neutronics

### Full Text

### References

- [1] K. Ochiai et al., J. Plasma Fusion Res. 84, No.9, 594 (2008).
- [2] S. Ohnishi et al., Fusion Eng. Des. 87, 695 (2012).
- [3] K. Shibata, O. Iwamoto, T. Nakagawa, N. Iwamoto, A. Ichihara, S. Kunieda, S. Chiba, K. Furutaka, N. Otuka, T. Ohsawa, T. Murata, H. Matsunobu, A. Zukeran, S. Kamada and J. Katakura, J. Nucl. Sci. Technol. 48(1), 1 (2011).
- [4] K. Shibata, O. Iwamoto, T. Nakagawa, N. Iwamoto, A. Ichihara, S. Kunieda, S. Chiba, N. Otuka and J. Katakura, “JENDL-4.0: A New Library for Innovative Nuclear Energy Systems”, Proc. 2010 International Conference on Nuclear Data for Science and Technology (ND2010), J. Korean. Phys. Soc. 59(23), 1046 (2011).
- [5] A. Koning et al., “The JEFF-3.1 Nuclear Data Library”, JEFF report 21, OECD (2006).
- [6] M.B. Chadwick et al., Nucl. Data Sheets 107, 2931 (2006).
- [7] N. Hayashi, S. Ohnishi, F. Sato and I. Murata, “Optimization of Experimental System Design for Benchmarking of Large Angle Scattering Reaction Cross section at 14 MeV Using A Shadow Bar”, Proc. 2015 Symposium on Nucl. Data, Nov. 19-20, 2015, Ibaraki Quantum Beam Research Center, Tokai-mura, Ibaraki, Japan, JAEA-Conf 2016-004(INDC(JPN)-202), pp. 205-210 (2016).