Highlights from the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at ISOLDE

Laser spectroscopy techniques are well-established tools for the measurement of the hyperfine structure and isotope shifts of exotic nuclei [1,2]. From these observables information can be extracted about the nuclear electromagnetic properties and changes in the mean square charge radii. The Collinear Resonance Ionization Spectroscopy (CRIS) experiment [3] combines the advantages of two techniques: the high spectral resolution of collinear laser spectroscopy and the high sensitivity of the resonance laser ionization method. Since the first high resolution study performed on francium isotopes in 2014 [4], the CRIS technique has been under continuous developments leading to the successful study of 8 elements and more than 100 isotopes. In this presentation, several of our key milestones along with the challenges that were overcome will be presented. Until this year the study of nuclear properties was the main focus of the CRIS collaboration. However, recent developments uncovered the potential of the CRIS technique to probe state-of-the-art molecular and atomic theories [5,6]. These topics are also will be discussed.

[1] R. Neugart et al., Journal of Physics G 44 (6), 064002 (2017).
[2] V.N. Fedosseev et al., Physica Scripta, 85, 5 (2012).
[3] T.E. Cocolios and R.P. de Groote et al., NIM B 376, 284 (2016).
[4] R.P. de Groote et al., PRL 115 (13), 132501 (2015).
[5] R.F Garcia Ruiz et al., PRX 8 (4), 041005 (2018).
[6] R.F. Garcia Ruiz et al., CERN-INTC-2018-017 / INTC-P-546 (2018).