Commissioning of a high-resolution collinear laser spectroscopy apparatus using a laser ablation ion source

摘要: Collinear laser spectroscopy is known as one of the powerful tools for the study of nuclear spins, electromagnetic moments and charge radii of the exotic nuclei. Aiming at studying these nuclear properties of unstable nuclei at the Beijing Radioactive Ion-beam Facility (BRIF) and the future High Intensity Heavy-ion Accelerator Facility (HIAF), we have firstly developed a collinear laser spectroscopy apparatus integrated with an offline laser ablation ion source and a laser system. The overall performances of this state-of-the-art technique and device have been commissioned by using the bunched stable ion beam. High-resolution optical spectra of $^{40,42,44,48}$Ca isotopes were successfully measured for the 4$s$ $^{2}S_{1/2}$ $ rightarrow$ 4$p$ $^{2}P_{3/2}$ (D2) ionic transition and the extracted isotope shifts relative to the $^{40}$Ca show an excellent agreement with the literature values. This system is now ready to be applied at the ratioactive ion beam facility, such as BRIF, and has paved the way for further development of the higher-sensitivity collinear resonant ionization spectroscopy.