Romero Fernandez, Jorge 
ORCID: 0000-0002-7845-5254
(2023)
Development of the MARA-LEB Facility.
PhD thesis, University of Liverpool.
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Abstract
The Mass Analyzing Recoil Apparatus Low-Energy Branch (MARA-LEB) is a new facility under development at the Accelerator Laboratory of the University of Jyväskylä, Finland, that has been designed to obtain isotopically pure radioactive beams of exotic nuclei and perform high-precision experiments to study their nuclear structure. The design of MARA-LEB is discussed, delineating the similarities and inspirations from other nuclear research facilities around the world, along with the unique set of components that differentiates it from other devices. The elements that comprise the facility are outlined in terms of their design concepts and their role in the experimental objectives of the MARA-LEB scientific programme. Simulations and preliminary tests of instruments are presented. Namely, the MARA-LEB gas cell is characterised in depth via window material simulations and gas flow simulations and experiments, including investigation on both transport efficiency and evacuation time. Simulations of the ion-optical transport and acceleration system are also shown, focused on obtaining preliminary working settings and investigating the transmission efficiency through the beamline. Experiments performed at both the IGISOL and MARA facilities are showcased. At the IGISOL facility, in-gas-cell resonance laser ionisation of natural tin isotopes was performed with the MARA-LEB gas cell. A characterisation of the resonant lineshapes and their response to different buffer gas pressures is reported. Two experiments performed using the MARA separator served as a source of information on production rates for different nuclei in the nuclear regions of interest for MARA-LEB. Yields of actinide elements via multiucleon transfer reactions at MARA are shown for the first time. Data on reaction product dispersion at the MARA focal plane was also collected, informing design aspects of the gas cell entrance window, which are also presented.
| Item Type: | Thesis (PhD) |
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| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 13 Feb 2024 16:31 |
| Last Modified: | 13 Feb 2024 16:32 |
| DOI: | 10.17638/03178038 |
| Supervisors: |
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| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3178038 |
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