Show simple item record

dc.contributor.advisorGreife, Uwe
dc.contributor.authorConnolly, Devin
dc.date.accessioned2015-12-16T16:38:18Z
dc.date.accessioned2022-02-03T12:52:40Z
dc.date.available2015-12-16T16:38:18Z
dc.date.available2022-02-03T12:52:40Z
dc.date.issued2015
dc.identifierT 7913
dc.identifier.urihttps://hdl.handle.net/11124/166666
dc.description2015 Fall.
dc.descriptionIncludes illustrations (some color).
dc.descriptionIncludes bibliographical references.
dc.description.abstractRadiative 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.
dc.format.mediumborn digital
dc.format.mediumdoctoral dissertations
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.relation.ispartof2015 - Mines Theses & Dissertations
dc.rightsCopyright of the original work is retained by the author.
dc.subjectastrophysics
dc.subjectgas targets
dc.subjectinverse kinematics
dc.subjection beams
dc.subjectradiative capture
dc.subjectscattering
dc.titleRadiative alpha capture on S34 at astrophysically relevant energies and design of a scattering chamber for high precision elastic scattering measurements for the DRAGON experiment
dc.typeText
dc.contributor.committeememberJensen, Mark
dc.contributor.committeememberSarazin, Frederic
dc.contributor.committeememberWiencke, Lawrence
thesis.degree.nameDoctor of Philosophy (Ph.D.)
thesis.degree.levelDoctoral
thesis.degree.disciplinePhysics
thesis.degree.grantorColorado School of Mines


Files in this item

Thumbnail
Name:
Connolly_mines_0052E_10872.pdf
Size:
6.856Mb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record