Ultraviolet Collinear Laser Spectroscopy of Cooled Exotic Nuclei

Abstract

An investigation into the nuclear structure of the Fe isotope chain around the N=28 shell closure using collinear laser spectroscopy has been performed. The investigation took place at the Ion Guide Isotope Separator On-Line (IGISOL4) facility at the accelerator laboratory of the University of Jyvaskyla. The electromagnetic moments of 55Fe were extracted for the first time, allowing the nuclear deformation of Fe to be tracked across the N=28 shell closure. In addition, the hyperfine structure parameters of 53g,55,57Fe and the isotope shifts of 52,53g,55,56,57Fe are reported. Calculations for the hyperfine structure of 53mFe are presented and will guide the resonance searches in an experiment due to take place in autumn 2023. Deep UV continuous wave light was produced for the first time by frequency quadrupling. The method through which it was created and the successful experimental deployment are reported in this work. An electrostatic ConeTrap for the purpose of optical pumping was developed. The rear electrode was remodelled to provide an increased acceptance time of 13 microseconds to accommodate a full ion bunch. The front electrode was remodelled to provide a 95% reduction in peak power demand from the switching electronics. The material from which the electrodes are made was changed from solid copper to a fine mesh providing more accurate alignment with the ion beam. Details on the simulations and implementation of the above are reported in this work. The development of a test bed for the commissioning ConeTrap is also detailed. The ConeTrap is currently undergoing testing and is to be deployed at the IGISOL4 facility in autumn 2023.

Date of Award	31 Dec 2023
Original language	English
Awarding Institution	The University of Manchester
Supervisor	Sean Freeman (Supervisor) & Paul Campbell (Supervisor)