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Study of unstable nuclear structure through hyperfine anomaly

通过超精细异常研究不稳定核结构

基本信息

批准号：
05044051
负责人：
MATSUKI Seishi
金额：
$ 3.52万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05044051/
关键词：
Hyperfine anomaly Unstable nuclear structure Atomic beam Laser microwave double resonance Hyperfine constant Nuclear g-factor レーザー・マイクロ波共鳴

项目摘要

The aim of the present investigation is to measure the finite broadening of magnetic moment of unstable nuclei through the observation of the hyperfine anomaly, so called Bohr-Weisskopf effect. Precision measurements of the hyperfine anomaly thus provide important information on the structure of unstable nuclei far from the stability line. For this purpose, precision measurements of both the hyperfine structure constant and nuclear g-factor have to be performed independently.We have constructed an apparatus with which we can measure both the hyperfine structure constant and the nuclear g-factor independently : The apparatus is of atomic-beam magnetic resonance system consisting mainly of three electromagnets and laser-microwave triple resonance system. Unstable ion beam from the CERN/ISOLDE mass separator is stopped in a neutralizer and then produced slow neutralized-atomic-beam is passed through the apparatus to perform the triple microwave magnetic resonance. The atoms are optically pumped to a suitable excited states and then depopulated with the applied microwave fields, thus enabling us to measure the resonances.The apparatus was successfully tested with off-line stable Cs beam and the precise data on the hyperfine anomaly of stable K and Rb nuclei have been extracted. The apparatus is now set-up at the CERN ISOLDE experimental hall, and is ready to be used for the on-line hyperfine anomaly measurements of unstable nuclei. We are expecting the first on-line measurements of hyperfine anomaly this year.

本研究的目的是通过观察超精细异常，即所谓的Bohr-Weisskopf效应，测量不稳定核磁矩的有限加宽。因此，超精细异常的精确测量提供了远离稳定线的不稳定核结构的重要信息。为此，必须对超精细结构常数和核g因子进行独立的精密测量，我们研制了一台能同时测量超精细结构常数和核g因子的装置：该装置是由三个电磁铁组成的原子束磁共振系统和激光-微波三重共振系统。将来自CERN/ISOLDE质量分离器的不稳定离子束停在中和器中，产生的慢中和原子束通过装置进行三重微波磁共振。原子被光抽运到合适的激发态，然后用外加微波场去布居，从而使我们能够测量共振态，该装置已成功地用离线稳定Cs束进行了测试，并提取了稳定K和Rb核超精细异常的精确数据。该装置已安装在CERN ISOLDE实验大厅，准备用于不稳定核超精细异常的在线测量。我们期待着今年首次在线测量超精细异常。