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Lan, Z.*; 余語 覚文*; Mirfayzi, S. R.*; 早川 岳人*; 小泉 光生; Wei, T.*; Shi, B.*; 石本 崇*; Golovin, D.*; 森 隆人*; et al.
no journal, ,
High penetration power of neutrons is potentially useful for realizing opaque object analysis in non-destructive way. Large-scale particle accelerators and nuclear reactors are mostly used for development of neutron analyzing method. A Laser-Driven Neutron Source (LDNS) has been proposed as a new approach of neutron generation for non-destructive analysis. Demonstration experiments on neutron resonance measurement ware performed at ILE, Osaka Univ., Japan. The Peta-watt laser LFEX was used to shoot a CD (deuterated plastic) foil target to produce accelerated charged deuterons. Neutrons are generated by nuclear reaction between a cylindrical beryllium and the accelerated deuteron, and then moderated by a high-density polyethylene (HDP). Neutrons of 1
20 eV were observed with a neutron detector at a 1.8 m using neutron resonance diagnosis technology. This report describes the results of the first experimental demonstration.
Lan, Z.*; 余語 覚文*; Mirfayzi, S. R.*; 小泉 光生; 早川 岳人*; 有川 安信*; 安部 勇輝*; Golovin, D.*; 森 隆人*; Wei, T.*; et al.
no journal, ,
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.