Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..ses.nb006s&link_type=abstract
American Physical Society, 75th Annual Meeting of the Southeastern Section of APS, October 30-November 1, 2008, abstract #NB.006
Physics
Scientific paper
The Optical-readout Timing Projection Chamber (O-TPC), operating with a CO2(80%)+N2(20%) gas mixure at 150 Torr, has been successfully commissioned at TUNL/HIγS with alpha-particles from a ^148Gd standard source. The O-TPC will be used to study the ^16O(γ,α)^12C reaction, the time-reversed reaction of the oxygen formation in stellar helium burning. This reaction is considered to be of major importance since it determines the C/O ratio that in turn determines the final state of a supernova (black hole or neutron star). While we studied this reaction at 9.55 MeV, on the 1^- resonance of ^16O, we also took an advantage of the powerful detection system to investigate the ^16O(γ,3α) reaction at 10.53, 10.84, and 11.16 MeV gamma energy from HIγS, spanning the 1^- resonance of ^12C located at 10.84 MeV which may or may not contribute to carbon formation during stellar helium burning. We will describe these two recent experiment and preliminary results from our data analysis that is in progress both at Yale and TUNL/Duke University.
Ahmed Mohammad W.
Breskin Amos
Bromberger Benjamin
Clinton E. R.
Dangendrof V.
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