[en] Three time since 1992, we have held the symposia entitled ''Joint Spectroscopy Experiments Utilizing JAERI Tandem-Booster Accelerator'' at the Tokai Research Establishment. In the symposia, we have mainly discussed the plans of experiments to be done in this joint program. The joint program started in 1994. Several experiments have been made since and some new results have already come up. This symposium ''Gamma-ray Spectroscopy utilizing heavy-ion, Photon and RI beams'' was held at Tokai Research Establishment of JAERI. Because this symposium is the first occasion after the program started, the first purpose of the symposium is to present and discuss the experimental results so far obtained using the JAERI Tandem-Booster. The second purpose of the symposium is to discuss new possibilities of gamma-ray spectroscopy using new resources such as RI-beam and Photon-beam. The participants from RIKEN, Tohoku University and JAERI Neutron Science Research Center presented the future plans of experiments with RI-beam at each facility. Compared with these nuclear beams, photon beam provides a completely new tool for the γ-ray spectroscopy, which is achieved by inverse Compton scattering between high-energy electron and laser beams. The 23 of the presented papers are indexed individually. (J.P.N.)

[en] The Minicrystal Ball of the present project, in which there are 5 detectors newly equipped by Japan Atomic Energy Research Institute and 6 detectors of University of Tsukuba, and the tandem booster target room are shown. The Minicrystal Ball is installed in the 50deg beam line. As the other detectors than those for γ-ray, there are silicon ball and the PSD for Coulomb excitation. Around the ball, as the accessory facilities, automatic liquid nitrogen supplier, liquid nitrogen dewer, electronic circuit system, the work station for data collection and others are arranged. The arrangement of components in a beam line is shown, and the notice for its use is described. Ethernet LAN channel chart is shown. The themes of the application of tandem booster experiments from August to December and the result of decision are reported. Six experiments for 23 days were adopted. It was decided to carry out joint experiments by extending to the next cycle. As the schedule for hereafter, the detectors of JAERI are set in early August, and the detectors of University of Tsukuba, circuit system and data collection system are carried in late August. The design of the future crystal ball is explained. (K.I.)

[en] Feasibility of application of the multidimensional γ ray spectroscopy for analytical chemistry was examined. Two reference igneous rock (JP-1, JB-1a) samples issued by the Geological Survey of Japan (GSJ) were irradiated at a research reactor with thermal neutrons, and γ rays from the radioisotopes produced by neutron capture reactions were measured using a γ-ray detector array. Simultaneously 27 elements were observed with no chemical separation

[en] Published in summary form only

[en] Short communication

[en] We have been searching for double-γ vibrational states in deformed nuclei through multiple Coulomb excitation. Here we present a preliminary result for ¹⁶⁴Dy. (author)

[en] The present status and the future plan on the development of facility of MPGA (Multiple Prompt Gamma-ray Analysis) in JRR-3M are described. The utilization plan in J-PARC (Japan Proton Accelerator Research Complex) is also outlined on the beam line for the neutron reaction experiments and MPGA. In JRR-3M, four detectors were set, the apparatus for rapid data collection being almost completed. The gamma-ray data base for each nucleus and the development of softs for quantitative analysis have been started. The introduction of four sets of clover-type detectors was further planned. The development of softs will be completed. In J-PARC, the research and development of nuclear data for the new reactor has been promoted using the pulse neutron source with high intensity. (M.H.)

[en] By combining the prompt gamma-ray analysis with the gamma-ray coincidence measurement, we have been developing multiple prompt gamma-ray analysis (MPGA). An apparatus for MPGA has been installed at JRR-3 neutron guide hall in Japan Atomic Energy Agency. This construction has started in FY2003 and is at the final stage at present. The present status of the facility is presented. (author)

[en] In recent years, the promotion of recycling of steels is desired from the viewpoints of effective usage resources and restraint of CO₂ emission. On the other hand, some elements (As, Sb, Bi, B, Zn and so on) affect seriously the characteristics of recycled steel and it is difficult tc refine away these elements from recycled steel in the iron recycling process. These elements are called tramp elements. For that reason, a new technique to determine the tramp elements in steel is demanded. In this paper, tramp elements, As and Sb, in iron certified reference materials were determined by neutron activation analysis with multiple gamma-ray detection method. For determination of As, two samples (JSS001-5, JSS168-7) were irradiated for 10 min at a neutron flux of 5.2 x 10¹⁷ m^-2s^-1 and measured by the multiple gamma-ray detector, GEMINI-II, which consists of 16 Ge detectors with BGO Compton suppressor, for 12 h. For determination of Sb, seven samples (JSS001-5, JSS003-2,4 and so on) were irradiated for 5 h at a neutron flux of 9.6 x 10¹⁷m^-2s^-1 and measured by GEMINI-II for 24h. The determined values were in good agreement with the certified and reference values. The lower limit of determination values for As and Sb in high purity iron were 0.01 and 0.003 ppm, respectively. The demand on the limit of determination values for As and Sb is 0.1 ppm. From these results, this method has turned out to be useful for determining As and Sb in recycled steel. (author)

[en] Method of multiparameter coincidence spectrometry based on gamma-gamma coincidence is widely used in the field of nuclear structure studies, and has produced many successful achievements. We developed a new technique of trace element analysis based on neutron activation analysis with coincident gamma-ray detection. In order to improve the low efficiency of coincident gamma-ray detection, an array of 16 Ge detectors with BGO Compton suppressors was used for this method. High sensitive trace element analyses without chemical separation were carried out by the combination of neutron activation analysis and the method of multiparameter coincidence spectroscopy. In this study, we try to measure trace elements in presolar grains using neutron activation analysis with multiple gamma ray detection. Presolar grains are synthesis in stars such as the Super nova or Red giant, and found in the primitive meteorites. We obtained 160 micro grams of nanodiamonds which is one of presolar grains from the Allende meteorite, and measured trace elements in the grains using this method. 8 elements in presolar grain were detected. (author)