Departmental Bulletin Paper 超流動ヘリウム中に打ち込まれた低収量核原子の超微細構造間隔測定に向けた光学クライオスタットの開発

江上, 彪

We are developing a new atomic laser spectroscopic method using superfluid helium named OROCHI to study the properties of nuclei whose production yield is small. We succeeded in the observation of the esonance signals using the laser - radio frequency (RF) and the laser - microwave (MW) double resonance methods in the experiments for 84-87Rb ion beams of an order of 104 ions/s provided from an accelerator facility. However, the signal strength was small, so difficulties were anticipated for the application of this method to lower-production yield nuclides. In order to find the experimental conditions to maximize the MW resonance signal intensity, we measured the resonance signal intensity dependence on the MW power and the position of an antenna using Rb vapor which is enclosed in a glass cell. We have also developed the system to introduce MW power to the optical cryostat which is used for the accelerator xperiments. As a result of the development, we expect that the resonance signal intensity will be increased by a factor of at least 6.Key Words : Laser spectroscopy, super fluid helium

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