Speaker
Description
In the study of short-lived radionuclides, Collinear Laser Spectroscopy (CLS) plays an important role as it reveals nuclear ground state properties such as spin, electro-magnetic moments and mean-square nuclear charge radii [1, 2].
To access exotic radionuclides with very low production yields, the Multi Ion-Reflection Apparatus for Collinear Laser Spectroscopy (MIRACLS) is currently being developed at ISOLDE. This novel approach will significantly improve the experimental sensitivity of CLS by confining an ion bunch of rare isotopes in a multi reflection time of flight (MR-ToF) device. Hence, while the ions are bouncing back and forth between the electrostatic mirrors of the MR-ToF apparatus, the same ion bunch can be probed by the spectroscopy laser during each revolution. This increased observation time boosts the sensitivity by a factor of 30-600 compared to conventional CLS. At the same time, the high resolution of CLS on fast beams, which is approaching the natural line width, is maintained as MIRACLS’ future MR-ToF device will be operated at unprecedented 30 keV.
This presentation will show recent results of a proof-of-principle experiment utilizing a low energy MR-ToF setup [3] which was modified for the purpose of CLS [4–6]. This allowed the successful experimental demonstration and systematic studies of the novel MIRACLS concept with ∼1.5 keV ion beams of stable magnesium and calcium isotopes. Furthermore, progress of the development of the future 30 keV-device will be shown.
References
[1] P. Campbell, I. Moore, M. Pearson, Progress in Particle and Nuclear Physics
2016, 86, 127–180.
[2] R. Neugart et al., J. Phys. 2017, G44:6, 064002.
[3] M. Rosenbusch et al., AIP Conference Proceedings 2013, 1521, 53–62.
[4] F. Maier et al., Hyperfine interactions 2019, 240:54.
[5] S. Sels et al., Nucl. Instrum. Methods Phys. Res. Section B 2019, 0168-583X.
[6] S. Lechner et al., Hyperfine Interactions 2019, 240:95.