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  • 1 Japan Atomic Energy Research Institute Department of Materials Science Tokai, Ibaraki 319-1195 Japan
  • | 2 Tokyo Metropolitan University Department of Chemistry, Graduate School of Science Hachioji, Tokyo 192-0397 Japan
  • | 3 University of Tokyo Research Center for Nuclear Science and Technology Yayoi 2-11-16, Bunkyo-ku Tokyo 113-0032 Japan
  • | 4 University of Tokyo Graduate School of Arts and Sciences Komaba 3-8-1, Meguro-ku Tokyo 153-8902 Japan
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By combining neutron activation analysis with multiple gamma-ray detection (gamma-gamma coincidence), we have proved better sensitivity and resolution for the trace element analysis than the ordinary single gamma-ray detection method. We now try to apply the multiple gamma-ray detection method to the prompt gamma ray analysis (PGA). We have established a new cold neutron beam line for PGA in Japan Research Reactor, JRR-3M, at Tokai establishment of Japan Atomic Energy Research Institute (JAERI). It consists of a beam shutter, a beam attenuator, a gamma-ray detector array, a sample changer, and a beam stopper. We construct a high-efficiency gamma-ray detector array specially designed for this purpose. Its performance has been evaluated with the Monte Carlo simulation code, GEANT 4.5.0.