Physics – Nuclear Physics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..dnp.be002b&link_type=abstract
American Physical Society, 2007 Annual Meeting of the Division of Nuclear Physics, October 10-13,2007, abstract #BE.002
Physics
Nuclear Physics
Scientific paper
Recent halo star abundance observations exhibit the presence of a consistent r-process pattern between the second, A 130, and third, A 195, peaks. This universal pattern is known as the ``main'' r-process. Using the neutrino-driven wind of the core-collapse supernova as our guide, we explore fission cycling and steady-β flow as the driving mechanisms behind production of this ``main'' r-process. These mechanisms robustly produce the general structure of the ``main'' r-process. In the core-collapse supernova environment, neutrinos play an important role as they facilitate the explosion mechanism and influence the elemental composition of the outflow. As conditions must be more neutron-rich than current wind models predict for both fission cycling and steady-β flow to occur, we examine wind environments under a variety of neutrino luminosities and effective temperatures. We find a reduction in the electron neutrino luminosity is necessary to allow for both fission cycling and steady-β flow. This reduction may result from active-sterile neutrino oscillations or other new physics.
Beun Joshua
Hix Raph
McLaughlin Gail
Surman Rebecca
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