|
|
Type of Document Dissertation Author Ugalde, Claudio Author's Email Address cugalde@nd.edu URN etd-07222005-162211 Title The 19F(a,p)22Ne reaction and the nucleosynthesis of fluorine Degree Doctor of Philosophy Department Physics Advisory Committee
Advisor Name Title Michael Wiescher Committee Chair Mitchell Wayne Committee Member Philippe Collon Committee Member Umesh Garg Committee Member Keywords
- experimental
- AGB stars
- R-matrix
- nuclear astrophysics
- fluorine
Date of Defense 2005-07-05 Availability restricted Abstract The 19F(a,p)22Ne reaction is considered to be the main source of fluorine depletion during the Asymptotic Giant Branch and Wolf-Rayet phases in stars. The reaction rate still retains large uncertainties due to the lack of experimental studies available. The yields for both the ground p0 and first excited state p1 exit channels of 22Ne have been measured with the University of Notre Dame KN van de Graaff accelerator. Several resonances were found in the energy range Elab=792-1990 keV and their energies and reduced width amplitudes have been determined in the context of the R-matrix theory of nuclear reactions. A new reaction rate is provided and the impact the new rate has for thenucleosynthesis of fluorine in stellar environments is discussed.
Files
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access UgaldeC072005.pdf 1.70 Mb 00:07:52 00:04:03 00:03:32 00:01:46 00:00:09 indicates that a file or directory is accessible from the campus network only.