2015 Fiscal Year Annual Research Report
共鳴イオン化分光法による不安定タングステン、オスミウム同位体の研究
| Project/Area Number |
14F04735
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
和田 道治 国立研究開発法人理化学研究所, 仁科加速器研究センター, チームリーダー (50240560)
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| Co-Investigator(Kenkyū-buntansha) |
REPONEN MIKAEL 国立研究開発法人理化学研究所, 仁科加速器研究センター, 外国人特別研究員
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| Project Period (FY) |
2014-04-25 – 2017-03-31
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| Keywords | radioactive ion beam / laser spectroscopy / gas cell |
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| Outline of Annual Research Achievements |
The first commissioning experiment of the PALIS system took place in late October 2015 followed by intense months long testing period. The nearly 2 week long experiment was successful as it showed that the PALIS gas cell does not interfere with primary experiment and that it is able to stop the beam from BigRIPS both in parasitic as well as in primary modes. The latter was confirmed by detecting a radioactive decay signal on a silicon detector placed in the vicinity of the gas cell exit hole. While the lasers were utilized during the experiment, no discernible laser ionization signal was observed. A follow up experiment may take place in autumn 2016.
The second large project undertaken during the FY2015 has been the development of an injection-seeded laser set-up. Following the initial decision of the specifications, the laser design wad finished in summer 2015. The design process utilized finite-element simulations and Gaussian-beam calculations to achieve a stable baseplate design with well defined and reproducible resonator configuration.
The laser operation and utilization for resonance ionization spectroscopy was confirmed in off-line experiments performed in collaboration with the University of Nagoya. These experiments demonstrated the laser operation and in ~780 nm region which yielded access to Zr first step wavelength at 388 nm through second harmonic generation. The resonance ionization spectroscopy tests were performed on the stable Zr isotopes ans the hyperfine structure was partially resolved in 91Zr with a total linewidth of <500 Mhz.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
パラサイトのRIビームの生成およびその過程における共鳴イオン化レーザー分光を難元素（タングステン、オスミウム等）に適用するために入射種光同期パルスレーザーを開発しているが、そのオンライン試験にこぎつけたことは大きな進捗である。一方、装置の故障のためオンラインでのレーザーでイオン化の確認には至らなかった。入射種光同期型レーザーの開発およびオフラインでの共鳴イオン化試験は順調にすすんでいる。
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| Strategy for Future Research Activity |
平成２８年度は、入射種光同期型レーザーを完成させ、高分解能の超微細構造分光を実行できるようにすると同時に、第二回のオンラインコミッショニング実験を成功させる。パラサイトでタングステン、オスミウム、その他の難元素の共鳴イオン化による高純度RIビーム取り出し、および、超微細構造分光を実行する計画である。
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