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Report No.

The Development of laser-driven epithermal neutron source for resonance spectral diagnostics, 2

Lan, Z.*; Yogo, Akifumi*; Mirfayzi, S. R.*; Koizumi, Mitsuo ; Hayakawa, Takehito*; Arikawa, Yasunobu*; Abe, Yuki*; Golovin, D.*; Mori, Takato*; Wei, T.*; Shi, B.*; Tanabe, Daiki*; Hiramatsu, Yusuke*; Nakanishi, Maiko*; Nishimura, Hiroaki*; Mima, Kunioki*; Nakai, Mitsuo*; Fujioka, Shinsuke*; Kodama, Ryosuke*

Neutron resonance diagnosis technology has been developed on reactors and accelerators for over ten years. By employing neutron beams with high transmittance, it is possible to analyse elementary composition, internal temperature and shock waves of thick objects in a non-destructive way. We developed a new approach to generate short-pulse epithermal neutron beams using relativistic intensity laser for the neutron resonance spectral diagnosis, which is known as Laser-driven Epithermal Neutron Source (LDENS). The neutron resonance measuring experiment was implemented at ILE, Osaka Univ. with peta-watt laser LFEX. The experimental results in 2020 demonstrated that LDENS is applicable for neutron resonance measurement. In 2021 experiments, we developed the system to record neutron spectrum with higher quality. Multiple resonance peaks of various isotopes with different temperature were clearly measured. The presentation will introduce the experimental results and discussions including characteristic evaluation of LDENS and temperature dependency of neutron resonance peaks.



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