A collinear laser spectroscopy extension to the McGill cooler-buncher set-up

麦吉尔冷却聚束装置的共线激光光谱扩展

• 批准号: 346149-2007
• 负责人: Buchinger, Fritz
• 金额: $ 1.53万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Research Tools and Instruments
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=361701
• 关键词: collinear; laser; spectroscopy; extension; McGill

Collinear fast beam laser spectroscopy is a well-established method for measuring hyperfine structures and isotopic shifts with high sensitivity and resolution. From the optical spectra information on nuclear ground state properties, such as spins moments and changes in mean square charge radii can be derived. The information is especially valuable when available for nuclei far from stability and is commonly used for testing and improving nuclear models and mass formulas.We have initiated a collinear fast beam laser spectroscopy experiment at ISAC (TRIUMF), where we have measured the nuclear moments of the short lived isotope 131La using continuous ion beams excited by a laser. However neighbouring isotopes are produced at ISAC with lower yields and the sensitivity of our apparatus has to be increased for extending our measurements. This will be possible by using bunched ion beams which will become available from a bunching device built for mass measurements with the TITAN mass spectrometer at ISAC. The use of bunched beams allows an increase of the signal to noise ratio in the observed spectra by using gating or coincidence techniques.This application asks for funds for components which will help us to establish a collinear fast beam laser spectroscopy section at our buncher device operated off-line at McGill. This set-up will be used for off-line tests of excitation and detection schemes, which will then be applied on-line at ISAC.

共线快束激光光谱是一种以高灵敏度和分辨率测量超精细结构和同位素位移的成熟方法。从光谱中可以得出有关核基态特性的信息，例如自旋矩和均方电荷半径的变化。这些信息对于远离稳定的原子核尤其有价值，通常用于测试和改进核模型和质量公式。我们在 ISAC (TRIUMF) 启动了一项共线快束激光光谱实验，我们使用激光激发的连续离子束测量了短寿命同位素 131La 的核矩。然而，ISAC 生产的邻近同位素的产量较低，并且必须提高我们设备的灵敏度才能扩展我们的测量范围。这将通过使用聚束离子束来实现，该离子束可通过 ISAC 的 TITAN 质谱仪为质量测量而构建的聚束装置中获得。聚束光束的使用可以通过使用选通或符合技术来增加观察到的光谱中的信噪比。该应用程序需要资金来购买组件，这将帮助我们在麦吉尔离线操作的聚束装置上建立共线快束激光光谱部分。该装置将用于激励和检测方案的离线测试，然后在 ISAC 进行在线应用。