Radiative α capture on ³⁴S has been shown to have an impact on nucleosynthesis in hot and explosive astrophysical environments, including stellar (core and shell) oxygen burning, Type II supernovae, and Type Ia supernovae. However, there exist discrepancies in the literature for the resonance strengths of two strong resonances within the Gamow window for oxygen burning temperatures (which ranges from ECM = 2.286 - 4.080 MeV at 2.2 GK). Previous measurements suffered from systematic uncertainties inherent in the experimental technique employed. Furthermore, there are several states in ³⁸Ar lying within the Gamow window for oxygen burning temperatures which no ³⁴S + α resonance strength/energy measurements have been performed. The strengths of these resonances could significantly impact the astrophysical reaction rate at oxygen burning temperatures. The present measurement was performed in inverse kinematics at the DRAGON electromagnetic mass separator. DRAGON's experimental technique allows direct measurement of quantities such as stopping power and resonance energy, alleviating the need for external inputs and reducing uncertainty in many cases. The results of the present measurement agree well with existing Hauser-Feshbach statistical models of the astrophysical reaction rate for ³⁴S (α,γ) ³⁸Ar in the temperature range of interest. Additionally, in order to increase the science reach of the DRAGON experiment, within this thesis a new type of scattering chamber was designed to allow for the high precision measurement of charged particle elastic scattering cross sections in inverse kinematics with radioactive beams. The chamber was designed and fabricated at CSM and for the first time tested in beam.
Copyright of the original work is retained by the author.
The export option will allow you to export the current search results of the entered query to a file. Different
formats are available for download. To export the items, click on the button corresponding with the preferred download format.
By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.
To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export.
The amount of items that can be exported at once is similarly restricted as the full export.
After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.