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Title: Collinear laser spectroscopy of scandium and yttrium isotopes at IGISOL IV
Author: Vormawah, L. J.
ISNI:       0000 0004 6495 8111
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2017
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This thesis presents the results of two separate collinear laser spectroscopy investigations; one of proton-neutron pairing correlations in the odd-odd self-conjugate nucleus 42Sc, and the other investigating the charge radii of neutron-rich Y isotopes and the sudden onset of nuclear deformation in the Z~40, N~60 region of the nuclear chart. For the first time, the 42g,42mSc isomer shift, and corresponding change in mean-square charge radius, has been studied via collinear laser spectroscopy at IGISOL IV. The result for the change in mean-square charge radius supports the qualitative prediction given by the intuitive picture of proton-neutron pairing, in which the nuclear charge radius should be greater for an I=0, T=1 nuclear state than an I≠0, T=0 state. This result is also, qualitatively speaking at least, in agreement with the results of previous proton-neutron pairing studies, namely studies of the charge radii of 38g,38mK and 50g,50mMn. In addition to this, new values of the atomic factors for the mass and field shift, F and M, have allowed for a recalibration of the Sc charge radii measured previously on the same atomic transition as used here. Spectroscopy has been performed on radioactive Y2+ ions for the first time. The motivation for this was to recalibrate previously measured charge radii for 86-90,92-102Y and isomeric states in 87-90,93,96,98Y, which were measured on the 363.3nm 5s2 S0 → 4d5p 1P1 transition occurring in the Y+ ion. The complexity of this transition hindered the ability to reliably calculate the atomic mass and field shift factors, which are necessary for extraction of nuclear charge radii.
Supervisor: Cheal, B. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral