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.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:634449 |
| Date | January 2014 |
| Creators | Ali, Fuad Arif |
| Publisher | University of Liverpool |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://livrepository.liverpool.ac.uk/2002600/ |
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