超微細異常の精密測定による不安定核構造の研究

通过精确测量超细异常来研究不稳定核结构

• 批准号: 07044081
• 负责人: MATSUKI Seishi
• 金额: $ 1.6万
• 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: 1995
• 资助国家: 日本
• 起止时间: 1995 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07044081/
• 关键词: Hyerfine an omaly; laser-rf louble resonance; unstable nuclear structure; CERN; ISOLDE; Hyperfine constant; magnetic moment

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 now the g factor of one of the unstable Cs isotopes has been measured with fairly well accuracy. We are expecting to measure hyperfine anomaly of various unstable Cs isotopes further in the next year.

本研究的目的是通过观察超精细异常（即所谓的玻尔-韦斯科普夫效应）来测量不稳定核磁矩的有限展宽。因此，超精细异常的精确测量提供了有关远离稳定线的不稳定核结构的重要信息。为此，超精细结构常数和核g因子的精密测量必须独立进行。我们构建了一种可以独立测量超精细结构常数和核g因子的装置：该装置是主要由三个电磁体和激光微波三重共振系统组成的原子束磁共振系统。来自CERN/ISOLDE质量分离器的不稳定离子束在中和器中停止，然后产生慢速中和原子束穿过该装置以进行三重微波磁共振。原子被光学泵浦到合适的激发态，然后用施加的微波场进行消除，从而使我们能够测量共振。该设备已成功使用离线稳定铯光束进行了测试，现在已经以相当好的精度测量了一种不稳定铯同位素的 g 因子。我们预计明年将进一步测量各种不稳定铯同位素的超精细异常。