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Title: Shape coexistence in the proton-unbound nucleus ¹⁷⁷Au
Author: Ali, Fuad Arif
ISNI:       0000 0004 5351 2755
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2014
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Excited states of the proton-unbound nucleus ¹⁷⁷Au have been populated following the ⁹²Mo(⁸⁸Sr,2pn) reaction in an experiment performed at the University of Jyväskylä Accelerator Laboratory. Gamma rays detected in the JUROGAM spectrometer were correlated with the characteristic α decays of ¹⁷⁷Au detected following a recoil implantation in the GREAT spectrometer. A large number of transitions (~ 60 γ rays) have been assigned unambiguously to ¹⁷⁷Au and ordered into four collective band structures and other single-particle excitations. Several intruder configurations formed by single-proton excitations across the Z = 82 shell gap have been established. These have been interpreted as πi13/2, πf7/2 ⊕ h9/2 and πh9=2 prolate configurations. It has been established that the πi13/2 and πf7/2 ⊕ h9/2 bands have decay paths to both the positive-parity mixed (1/2⁺ ⊕ 3/2⁺) ground state and the negative-parity 11/2⁻ isomer, which is unusual in this mass region. Structures based on the coupling of the odd π h⁻¹ 11/2 proton hole to excitations of the ¹⁷⁸Hg core have been established in the excitation level scheme. An oblate πh⁻¹ 11/2 ⊗ ¹⁷⁸Hg(2⁺₁) state and a prolate strongly coupled band based on the πh⁻¹ 11/2 ⊗ ¹⁷⁸Hg(0⁺₂) configuration have been identified. The decay paths from the strongly coupled band and the search for evidence of electric monopole decays are discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available