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.

共线快光束激光光谱学是一种高灵敏度和高分辨率的测量超精细结构和同位素位移的成熟方法。从光谱可以得到关于核基态性质的信息，如自旋矩和均方电荷半径的变化。这些信息对于远离稳定性的原子核尤其有价值，通常用于测试和改进原子核模型和质量公式。我们在ISAC(TRIUMF)启动了一个共线快光束激光光谱学实验，在那里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以较低的产率生产邻近的同位素，为了扩大我们的测量范围，我们的仪器的灵敏度必须提高。这将通过使用聚束离子束成为可能，聚束离子束将从ISAC的泰坦质谱仪为质量测量而建造的聚束设备中获得。聚束光束的使用允许通过使用选通或符合技术来提高观测光谱中的信噪比。这项申请要求为部件提供资金，以帮助我们在McGill离线操作的聚束器设备上建立共线快速光束激光光谱学部分。这一设置将用于激励和检测方案的离线测试，然后在ISAC在线应用。