| Co-Investigator(Kenkyū-buntansha) |
MUTA Taizo Faculty of Science, HIROSHIMA UNIVERSITY Professor, 理学部, 教授 (80025353)
TAKAHASHI Tooru Faculty of Science, HIROSHIMA UNIVERSITY Research Associate, 理学部, 助手 (50253050)
ENDO Ichita Faculty of Science, HIROSHIMA UNIVERSITY Professor, 理学部, 教授 (90033894)
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| Research Abstract |
The purpose of this study is to measure the parity mixing of close-lying opposite-parity level pairs of rare earth atoms over wide range of isotopes and to inspect various theoretical models beyond the electroweak standard model. The obtained results during 1995-1997 fiscal years are described in the following.
1. The absolute wavelengths of the new ring dye and Ti/Sapphire lasers were calibrated from visible to infrared region. The laser was stabilized with the signal from saturated-absorption and frequency-modulated spectroscopies of Rb-D2 line, and the absolute frequency drift was improved from several hundred MHz/h to 0.7MHz/h.
2. The atomic-beam oven, electrostatic electrodes and electromagnet were newly installed in large-size vauum chamber, and CAMAC interface module & software were prepared to control the directions of electromagnetic fields and laser polarization. As a result of general tests, the whole system was operated well and the duration time of stable atomic beam was improved to 70 hours.
3. By using the above system, hyperfine structures, isotope shifts and Zeeman-Stark effects were systematically measured for many close-lying opposite-parity level pairs of Sm, Pr and Tm atoms, and precise spectroscopic data were obtained. Particularly in a level of Sm I,large Stark splitting was observed, and clear isotope dependence of the tensor polarizability was found for the first time.
4. The above results were published in 16 oral presentaitons in the meetings of Japanese Physical Society, 4 presentations in international conferences, 8 articles in the scientific journals, 5 master and 3 doctoral theses in the Faculty of Science, Hiroshima university.
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