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Type of Document Dissertation Author Couture, Aaron Joseph URN etd-12152005-144632 Title 19F(p,g)20Ne and the Stellar CNO Burning Cycle Degree Doctor of Philosophy Department Physics Advisory Committee
Advisor Name Title J. Daniel Gezelter Committee Chair Ani Aprahamian Committee Member John Losecco Committee Member Michael Wiescher Committee Member Philippe Collon Committee Member Keywords
- CNO Cycle
- Fluorine-19
- Stellar Hydrogen Burning
Date of Defense 2005-12-07 Availability unrestricted Abstract A new measurement of the 19F(p,g) breakout reaction to CNOcycle has been completed at the University of Notre Dame,
covering energies from 200-800 keV. The sensitivity
of the measurement is a significant improvement over past measurements,
including measurements of sufficient accuracy to observe previously
unmeasured interference terms. As part of the development for
the measurements, an particle accelerator of nuclear astrophysics
was refurbished and installed in the Nuclear Structure Laboratory
at the University of Notre Dame. A gamma-ray detector system
was designed for isolating high Q-value reactions in a strong gamma-ray
background.
The new measurements decreased the resonance strengths for the
19F(p,g) reaction which decrease the stellar reaction rate
by a factor of four. As 19F(p,g) represents the only
possible breakout path from the cold CNO cycle, this confirmed that
the CNO cycle is closed in typical stellar burning scenarios.
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