ISOLDE Seminar

"Laser Spectroscopy of Antimony Isotopes and the Design of a Cryogenic Paul Trap"

by Simon Lechner (CERN, TU Wien)

Europe/Zurich
CERN

CERN

Description

For the first time, ab initio calculations have been performed above the proton shell closure at Z = 50, i.e. for the antimony (Sb, Z = 51) isotopic chain. In order to benchmark the latest advances in nuclear theory, electromagnetic properties along the Sb isotopic chain 112−134Sb, including 11 isomers, have been measured by collinear laser spectroscopy (CLS) at COLLAPS. From the obtained hyperfine spectra, nuclear observables such as nuclear spins, magnetic dipole moments, electric quadrupole moments and charge radii are extracted. In the first part of this talk, these new results are presented in comparison to theory.

In order to extend the experimental reach of CLS, especially to certain key nuclides very far away from stability, a more sensitive CLS method is introduced in the second part of the talk. At the Multi Ion Reflection Apparatus for Collinear Laser Spectroscopy (MIRACLS), ion bunches are trapped in a multi-reflection time-of-flight device. Thus, the ions can be repeatedly probed by a laser beam compared to only once in conventional, single-passage CLS. To fulfill MIRACLS’ opposing requirements of a small temporal ion-bunch width and small energy spread, a buffer-gas filled cryogenic Paul trap was designed for optimal ion-beam preparation.