a 한국기술교육대학교 신소재공학과
b 한국원자력연구원 중성자응용기술부
c 성균관대학교 물리학과
a Department of Materials Engineering, Korea University of Technology Education, Chunan, Chungnam 31253, Korea
b Neutron Utilization Technology Division, Korea Atomic Energy Research Institute, Daejeon 34057, Korea
c Department of Physics, Sungkyunkwan University, Suwon, Gyeonggi 03063, Korea
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