Drummond, Mark Christopher
Spectroscopy of ¹⁶³,¹⁶⁵Os and ¹⁶⁴Ir.
Doctor of Philosophy thesis, University of Liverpool.
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Abstract
Excited states in the neutron-deficient isotopes ¹⁶³Os and ¹⁶⁵Os were identified using Jurogam and GREAT spectrometers in conjunction with the RITU gas-filled separator. The ¹⁶³Os and ¹⁶⁵Os nuclei were populated via the ¹⁰⁶Cd⁶⁰(Ni,3n) and ⁹²Mo(⁷⁸Kr,2p3n) reactions at bombarding energies of 270 MeV and 357 MeV, respectively. Gamma-ray emissions from these nuclei have been established unambiguously using the recoil-decay tagging technique and a coincidence analysis has allowed level schemes to be established. These results suggest that the yrast states are based upon negative-parity configurations originating from the νf⁷/₂ and νh⁹/₂ orbitals. The neutron deficient odd-odd nucleus ¹⁶⁴Ir has been studied using the GREAT spectrometer in conjunction with the RITU gas-filled separator. The experiment was performed using the ⁹²Mo(⁷⁸Kr, p5n)¹⁶⁴Ir reaction at bombarding energies of 420-450 MeV for 12 days. An alpha decay has been observed for the first time with an energy of 6880 ± 10 keV and a branching ratio of 4.8 ± 2.2 % and assigned as the decay of the πh¹¹/₂ state of ¹⁶⁴Ir. The energy of the proton decay of the high-spin state has been measured to a higher precision as 1814 ± 6 keV. The half life of this state has been measured to be 70 ± 10 μs. The DSSDs of the GREAT spectrometer have been instrumented using digital electronics for the first time and a pulse shape analysis has been performed to observe particle emission within the dead time of the detector.
| Item Type: | Thesis (Doctor of Philosophy) |
|---|---|
| Additional Information: | Date: 2013-10 (completed) |
| Subjects: | ?? QC ?? |
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 10 Feb 2014 14:46 |
| Last Modified: | 16 Dec 2022 04:39 |
| DOI: | 10.17638/00013313 |
| Supervisors: |
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| URI: | https://livrepository.liverpool.ac.uk/id/eprint/13313 |
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