Spectroscopy of ¹⁶³,¹⁶⁵Os and ¹⁶⁴Ir

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:	Page, Robert Chartier, Marielle
URI:	https://livrepository.liverpool.ac.uk/id/eprint/13313