Speaker
Description
Z. Yan1, X. F. Yang1, on behalf of PLASEN collaboration
1School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
The study of exotic structures in unstable nuclei lies at the forefront of nuclear physics [1]. The fundamental properties of these nuclei are intimately related to nuclear structure and nucleon-nucleon interactions, making them crucial for exploring a variety of exotic phenomena, including halo structure, island of inversion, and shell evolution. Laser spectroscopy can accurately measure the hyperfine structure and isotope shifts of atoms and ions, enabling the extraction of fundamental nuclear properties such as spins, magnetic moments, electric quadrupole moments, and charge radii in a nuclear-model-independent manner [2]. Among various laser spectroscopy techniques, collinear resonance ionization spectroscopy is distinguished by its high resolution and sensitivity, offering a powerful approach for studying unstable nuclei and evaluating nuclear structure models.
Our group focuses on developing advanced laser spectroscopy systems for radioactive ion beam facilities in China [3-4]. Currently, we have successfully established PLASEN (Precision Laser Spectroscopy for Exotic Nuclei), a fully functional high-resolution and high-sensitivity collinear resonance ionization laser spectroscopy system for off-line and on-line experiments. In off-line experiments, multiple lasers were employed for the excitation and ionization of the corresponding atoms, and optimal schemes with the highest efficiency were chosen. Under these conditions, the hyperfine structure spectra of 85, 87Rb and 133Cs were successfully measured [5-6]. With these experimental configurations established, on-line experiments have recently been conducted at BRIF in China, where the hyperfine structure spectra of unstable Rb isotopes have been measured.
In this presentation, the principles of collinear resonance ionization laser spectroscopy will be introduced, followed by an overview of the PLASEN setup. Recent on-line and off-line experimental configurations and results will be presented, along with an outline of future developments.
[1] Ye, Y., Yang, X., Sakurai, H. et al. Physics of exotic nuclei. Nat Rev Phys 7, 21–37 (2025). https://doi.org/10.1038/s42254-024-00782-5
[2] Yang, X., Wang, S., Wilkins, S. G. et al. Laser spectroscopy for the study of exotic nuclei. Prog Part Nucl Phys 129 (2023): 104005.
[3] Bai, S., Yang, X. et al. Commissioning of a high-resolution collinear laser spectroscopy apparatus with a laser ablation ion source. Nucl Sci Tech 33.1 (2022): 9.
[4] Wang, S., Yang, X. et al. Construction and commissioning of the collinear laser spectroscopy system at BRIF. Nucl Instrum Meth A 1032 (2022): 166622.
[5] Hu, H., Guo, Y. et al. Development and characterization of a high-resolution, high-sensitivity collinear resonance ionization spectroscopy system. Sci Bull (2025). https://doi.org/10.1016/j.scib.2025.06.036
[6] Guo, Y., Yan, Z. et al. Development of Cesium Laser Resonance Ionization Schemes for the PLASEN Experiment. Chin Phys C (2025). https://doi.org/10.1088/1674-1137/adf49e
| Research field of your presentation | Experimental Low-energy nuclear physics |
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