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Title: Spectroscopy of excited states in ²⁵²No
Author: Parr, Edward John Eric
ISNI:       0000 0004 2729 0108
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2011
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A spectroscopic study of excited states in ²⁵²No was carried out to gain experimental evidence of the energies, orderings and assignments for the single particle levels in the region around the deformed shell gaps at N = 152 and Z = 100. Some of these energy levels are of particular interest as they lie close to the Fermi surface in the spherical region around the predicted next magic numbers. The ²⁵²No nuclei were produced at the accelerator laboratory in Jyväskylä, Finland, using the fusion evaporation reaction ²⁰⁶Pb(⁴⁸Ca,2n)²⁵²No and separated with the RITU gas filled separator. The JUROGAM and GREAT detector arrays were used for in-beam and focal plane spectroscopy respectively, allowing the recoils to be identified using recoil-decay tagging techniques. The previously identified $Kπ = 8⁻ K isomer was investigated, with in-beam γ-ray spectra of rotational band transitions above this state being observed for the first time and the level scheme up to Iπ = 19⁻ (and up to 22⁻ tentatively) being found. As the spectra produced were of low statistics, new approaches were required in their analysis to assign a single particle structural configuration to the excited state. Two methods are described which act to utilise the low statistics fully, the results of which provide strong indications that the 8⁻{7/2⁺[624]ν⊗9/2}⁻[734]ν} configuration is responsible for the isomer. These results are also compared with other excited states in nuclei around the deformed shell gaps to build up a picture of regional systematics. Their bearing on the predictions for the next spherical shell closures is also discussed.
Supervisor: Herzberg, Rolf-Dietmar Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
Keywords: QC Physics