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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. Tungate, Garry Colleges (2008 onwards) > College of Engineering & Physical Sciences School of Physics and Astronomy A paper based on this thesis is available at / QC Physics University of Birmingham 802
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