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Spectroscopy of neutron-rich oxygen and fluorine nuclei via single-neutron knockout reactions

Pietras, Ben (2009) Spectroscopy of neutron-rich oxygen and fluorine nuclei via single-neutron knockout reactions. Doctoral thesis, University of Liverpool.

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At the limits of nuclear stability, increasing proton-neutron asymmetry leads to a shifting of orbitals from nuclear shell model predictions. In turn this leads to a weakening of shell gaps such as at N = 20, and the emergence of new gaps at N = 14 and 16. To observe this evolution of the structure as the neutron dripline is approached, single-nucleon removal reactions have been employed for oxygen and fluorine isotopes. These reactions are an excellent way of probing the nuclear wavefunction to reveal information on the single-particle content in the wavefunction. Cross sections have been measured, both inclusive and exclusive, and partial production cross sections calculated. This has allowed spectroscopic factors to be extracted and compared to theoretical predictions from shell model calculations. Longitudinal momentum distributions, both inclusive and exclusive, have also been measured. The orbital angular momentum of the removed nucleon has a pronounced effect on the momentum distribution of the surviving core, which can be compared to theoretical predictions based on eikonal theory. This gives a valuable insight into the configuration mixing for the ground and excited states of the nuclei of interest.

Item Type:Thesis (Doctoral)
Departments, Research Centres and Related Units:Academic Faculties, Institutes and Research Centres > Faculty of Science > Department of Physics
ID Code:3713
Deposited On:22 Jul 2011 14:39
Last Modified:22 Jul 2011 16:16

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