Speaker
Description
2021 proved to be another fruitful year for the Collinear Resonance Ionization Spectroscopy (CRIS) collaboration with experimental campaigns on neutron-rich silver isotopes [1] and radium monofluoride molecules [2]. By performing high-resolution resonance ionization spectroscopy on radioactive species in a collinear geometry, the technique is able to exceed the sensitivity offered by traditional fluorescence-detected spectroscopy. The measured hyperfine structures and isotopes shifts give access to electromagnetic properties of nuclear ground and isomeric states allowing predictions from state-of-the-art atomic and nuclear theory to be tested.
Recent highlights from the collaboration include characterizing the nature of the N=32 neutron subshell gap in neutron-rich potassium [3], the evolution of nuclear ground-state properties towards $^{100}$Sn [4,5] and challenging the decades-old interpretation of ‘texbook’ single-particle behaviour in even-N indium isotopes [6]. The technique was also recently used to study the structure of radium monofluoride molecules [7], confirming predictions that it can be directly laser cooled. In addition, the vibronic structure of these molecules was shown to be highly sensitive to changes in the radium nuclear charge radii [8].
This contribution will discuss recent results and developments as well as outline future plans.
[1] deGroote, R.P. et al., INTC-P-551 (2020)
[2] Garcia Ruiz, R.F. et al., INTC-P-555 (2020)
[3] Koszorús, Á. et al., Nat. Phys. 17 429-443 (2021)
[4] Ricketts, C.M., PhD Thesis, University of Manchester (2020)
[5] Gustafsson, F.P., PhD Thesis, KU Leuven (2021)
[6] Vernon, A.R. et al., Research Square (10.21203/rs.3.rs-611360/v1) (under review)
[7] Garcia Ruiz, R. F. et al., Nature 581 396–400 (2020)
[8] Udrescu, S. M. et al., Phys. Rev. Lett. 127 033001 (2021)
