Laser Spectroscopy for Nuclear Physics


Investigating the exotic nuclear properties and structure of unstable nuclei far from the β-stability line remains a cornerstone of nuclear physics research. This has been triggered continuously by the unexpected phenomena observed in nuclei with an unusual proton to neutron ratio. Some examples are the changes of magic numbers, the inversion or intrusion of quantum orbits, halo and cluster structures, exotic nuclear shapes and so on, which were investigated under the joint effort of experimental and theoretical nuclear physicists.

Laser spectroscopy, as one of the powerful experimental tools, has made significant contribution to investigate the afore-mentioned nuclear phenomena. This is realized by measuring multiple nuclear properties in a nuclear-model-independent way, such as nuclear spins, magnetic dipole and electric quadrupole moments and charge radii. Although standard laser spectroscopy techniques have been established at various facilities around the world, more advanced techniques are continuously needed, especially for high resolution and high efficiency measurement of exotic isotopes at very low production yield, which allows the exploration of new nuclear structure and dynamics in the vicinity of the nuclear driplines. Our research interests have been focused on the development of such high-precision and high sensitivity laser spectroscopy techniques and the associated exotic nuclear structure studies of unstable nuclei being pushed closer towards the proton and neutron-dripline.

原子核的基本性质是核物理研究的基石,在核结构,核有效相互作用,核天体物理,核能和核技术应用等研究中不可或缺,尤其是在广阔的不稳定核区更是亟待开拓,被列入目前国际国内新一代核物理大科学装置的主要科学目标。我们的主要研究领域是利用多学科交叉的精密激光核谱技术来精确测量不稳定原子核的基本性质,从而探索和认知不稳定原子核中展现出来的新物理现象。主要工作包括:国内外高分辨高灵敏度的激光核谱技术的发展研制, 利用欧洲核子中心ISOLDE放射性束流线上的共线激光谱和共线共振电离谱设备进行不稳定核素的基本性质测量等。

Experiments

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COLLAPS@CERN_ISOLDE

COLLAPS is the COLlinear LAser SPectroscopy beam line located at ISOLDE-CERN. Collinear laser spectroscopy is a powerful tool to measure nuclear spins, magnetic moments, quadrupole moments and mean-square charge radii of short-lived isotopes far from stability, the so-called exotic nuclei.

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CRIS@CERN_ISOLDE

CRIS stands for Collinear Resonance Ionization Spectroscopy. The CRIS technique combines the high resolution innate to collinear laser spectroscopy with the sensitivity of ion detection. It is a powerful tool to measure nuclear spins, magnetic moments, quadrupole moments and mean-square charge radii of short-lived isotopes far from stability, the so-called exotic nuclei

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