Laser Spectroscopy at Argonne National Laboratory

The ATLAS facility offers excellent opportunities to utilize slow and stopped radioactive beams for nuclear structure research. The newly commissioned nuCARIBU source provides beams of neutron-induced U-235 fission fragments at low energies (20 keV) for experiments. At the N=126 factory, heavy isotopes in the lead region produced in flight via multinucleon transfer (MNT) reactions are stopped in a gas cell. At both beam stations, laser spectroscopy instrumentation is being developed to complement existing decay spectroscopy and mass measurement experiments.



I will report on the progress of the laser spectroscopy program at ATLAS, with a focus on the ATLANTIS laser spectroscopy beamline at nuCARIBU, which recently delivered its first results on charge radii of neutron-rich ruthenium isotopes. Currently, this beamline is being upgraded to implement resonance ionization spectroscopy (RIS) for enhanced sensitivity compared to the existing laser-induced fluorescence detection. The N=126 factory laser beamline is presently under construction. I will provide an overview of the implementation, discuss technical developments, and outline the physics program that can be performed there soon.