REMILLIEUX J Institute de Physique Nucleaire, Universite Claude Bernard Lyon-I, 原子核物理研究所, 教授
DRUETTA M Universite Claude Bernard Lyon-I, 原子分子分光学研究所, 助手
POIZAT J.C. リオン大学―I, 原子核物理研究所, 教授
東 俊行 東京大学, 教養学部, 助手 (70212529)
YAMAZAKI Yasunori College of Arts and Sciences, University of Tokyo., 教養学部, 助教授 (30114903)
KOMAKI Kenichiro College of Arts and Sciences, University of Tokyo., 教養学部, 助教授 (40012447)
AZUMA Toshiyuki College of Arts and Sciences, University of Tokyo.
PIZAT J. -C Institute de Physique Nucleaire, Universite Claude Bernard Lyon-I
|Budget Amount *help
¥2,000,000 (Direct Cost : ¥2,000,000)
Fiscal Year 1990 : ¥2,000,000 (Direct Cost : ¥2,000,000)
In consequence of the discussion among Japanese members about plans for experiments in GANIL (Grand Accele ateur National d'lons Lourds) in order to proceed with the study in which Na, F and Mg ions were used, so far, following three kings of measurements were determined : 1) Measurement of lower order resonance, if possible, first order one using heavy ion, 2) observation of the excitation to separated n=2 levels as a result of Stark effect, 3) investigation of the contribution of wave functions in these n=2 states to the charge state of transmitted ions and to the resonance of emitted X-ray spectrums which are measured from two different directions.
In order not only to negotiate with the members in France but also to investigate the conditions which would be prepared in GANIL, F. Fujimoto and K. Komaki stayed in France between Sep. 23rd and Oct. 3rd. After we discussed about our plans at Paris with Dr. Quere in Ecole Polytechnique, Dr. Remillieux in Universite Claude Bernard Lyon-1 a
nd Dr. Cohen in Universite Paris 7, we also discussed with Dr. Toulemonde at GANIL in Caen about substantial procedure, for example, what kind of ions could be accelerated, what was the obtainable energy, what kind of thin single crystal foils would be available, and so on. In our experiment, following beam qualities are needed : 1) The incident, energy of ions is adjustable with good resolution near the resonant point, 2) the beam which consists of hydrogen-like ions, has sufficient intensity without divergence. As a result of discussion, we decided that it would be possible to execute experiments, if some degrader, which is a thin plate and reduces ion energy by intersecting the beam, would be installed. To clarify the effect of degrader and make a examination, one of us took part in the experiment which was the measurement of RTE (Resonant Transfer & Excitation) by French group in the end of November.
K. Komaki stayed in GANIL between Nov. 25th and Dec. 4th and did experiment with French group. In this experiment, Xe^<44+> was accelerated up to 44 MeV and decelerated down to 43-31 MeV/u by using degrader and Xe^<52+> was selected, then this ion passed through Si crystal under the condition of channeling for <110> direction. He measured the charge state of transmitted ions and energy spectrum of emitted X-ray. The incident energy of ions was changed at intervals of 0.4-0.5 MeV/u (-1%) by inclining the degrader. The change of beam direction according to the change of its energy was less than 1/100 degrees and it took about one hour to change ion energy. From the above results, it was found that we could do a series of experiment within a sufficient short time. The main results were that the RTE condition was attainable if the incident energy of ions were chosen in order that the energies of Kalpha-line and L-REC (Radiative Electron Capture) X-ray of Xe were equal and it was also found that the intensity of X-ray increased in the range which corresponds to momentum distribution of conduction electron of Si.
Though our experiment could not be supported in GANIL within this fiscal year, it is in a promising state that we do experiment within next fiscal year. In order to get a substantial plan in detail, F. Fujimoto visits France in March. Less