Collinear laser spectroscopy of stable palladium isotopes at the IGISOL facility

Sarina Geldhof,Wouter Gins,Ruben De Groote,Iain Moore,Paul Campbell,Bradley Cheal

doi:10.1007/s10751-020-01713-3

Sarina Geldhof, Wouter Gins + Show 4 more

Open Access

https://doi.org/10.1007/s10751-020-01713-3

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Abstract

Collinear laser spectroscopy on stable palladium isotopes was performed at the IGISOL facility in Jyväskylä in preparation for an experiment on its neutron-rich isotopes. Five transitions from different initial atomic states were tested, with the goal of finding the most spectroscopically efficient. The observed intensities afforded a comparison with atomic-level population predictions based on charge-exchange calculations. For some transitions hyperfine parameters of 105Pd were measured, which were found to be in good agreement with literature values. A King plot analysis was performed using the measured isotope shifts and known charge radii from literature to determine the atomic field and mass shift factors.

Highlights

An experimental campaign to fill in the gap in optical spectroscopy data of radioactive isotopes in the region from Z = 43 to Z = 47 was started at the IGISOL facility at the Accelerator Laboratory in Jyvaskyla
Electrostatic deflectors guide the ions into the charge-exchange cell (CEC) and the light collection region (LCR)
An off-axis Micro-Channel Plate (MCP) detector and a MagneTOF mini-detector mounted on a linear actuator are installed after the CEC and LCR, which are used for both beam tuning and monitoring the neutralization efficiency

Summary

Introduction

An experimental campaign to fill in the gap in optical spectroscopy data of radioactive isotopes in the region from Z = 43 to Z = 47 was started at the IGISOL facility at the Accelerator Laboratory in Jyvaskyla. There are pertinent outstanding questions on the nuclear structure of neutron-rich nuclei in this region, with possible (rapid) changes in deformation and the presence of shape coexistence. These refractory elements can be produced at the IGISOL facility thanks to the chemical insensitivity of the production method. Having recently completed successful measurements on several neutron-rich silver isotopes, the element of choice is palladium. Knowledge about the ground-state properties is needed.

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