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Collinear laser spectroscopy of neutron-rich niobium

Rueffer, Mareike (2010)
Ph.D. thesis, University of Birmingham.

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Abstract

Hyperfine structure spectra and isotope shifts of the neutron-rich nuclei \(^{99}\)Nb, \(^{101}\)Nb, \(^{102}\)Nb and \(^{103}\)Nb were obtained at the IGISOL (Ion Guide Isotope Separator On-Line) facility at the accelerator laboratory of the University of Jyväskylä. The data were taken using collinear laser spectroscopy of bunched beams. Optical pumping from the ground state to populate metastable atomic states in the ion beam cooler allowed efficient spectroscopy of the ionic system that would otherwise be inaccessible due to a lack of suitable ground state resonance lines. The measurements of the hyperfine structure and the isotope shifts contribute valuable nuclear information to the understanding of the \(A\) ~ 100 region which displays a sudden onset of deformation that cannot be explained by the single particle shell model. It was possible to confirm the spin assignments for \(^{99}\)Nb, \(^{101}\)Nb and \(^{103}\)Nb as \(I\) = 9/2, \(I\) = 5/2 and \(I\) = 5/2 respectively. The extracted information on the mean square charge radii, \(\delta\big<r^2\big>\), the magnetic dipole moments, \(\mu\), and the electric quadrupole moments, \(Q\), confirm a shape change of nuclei at \(N\) = 60 from soft and oblate (for \(N\)< 60) to more rigid and strongly prolate shapes (for \(N\geq\)60).

Type of Work:Ph.D. thesis.
Supervisor(s):Tungate, Garry
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Physics and Astronomy
Additional Information:

A paper based on this thesis is available at /

Subjects:QC Physics
Institution:University of Birmingham
ID Code:802
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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