Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session B6: Building the Elements: 50 Years of B2FH Nucleosynthesis I |
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Sponsoring Units: FHP DAP Chair: Robert V. Wagoner, Stanford University Room: Hyatt Regency Jacksonville Riverfront Grand 7 |
Saturday, April 14, 2007 10:45AM - 11:21AM |
B6.00001: The Cosmic Abundance Distribution Decoded Invited Speaker: Fifty years ago E. M. Burbidge, G. Burbidge, W. A. Fowler, and F. Hoyle, and separately A. G. W. Cameron, made fundamental efforts in interpreting the abundance patterns in stars and meteorites in terms of thermonuclear processes in stars and supernova explosions. These ideas will be reviewed and compared to modern observations and theory. [Preview Abstract] |
Saturday, April 14, 2007 11:21AM - 11:57AM |
B6.00002: Big-Bang Nucleosynthesis from B$^2$FH to 21st-Century Cosmology Invited Speaker: In majestically laying out the case for element synthesis in stars, B${}^2$FH deliberately avoided primordial nucleosynthesis; nevertheless, they identified stellar sources and sinks for the lightest elements and presciently laid out issues which have remained at the center of big-bang nucleosynthesis (BBN) through to the the present. We will briefly review the theory of cosmological nucleosynthesis (to which Hoyle and Fowler made pivotal contributions) and its broad concordance with observed light element abundances; this agreement not only marks a great success for the hot big bang, but also measures the cosmic baryon density. BBN takes a changing but still central role in the dawning era of precision cosmology: measurements of the cosmic baryon density by WMAP and large-scale structure observations provide an independent test of BBN and cosmology. The status of this test will be discussed, as will implications for dark matter and dark energy. [Preview Abstract] |
Saturday, April 14, 2007 11:57AM - 12:33PM |
B6.00003: Nucleosynthesis in Supernovae Invited Speaker: Since B$^{2}$FH outlined both the processes and sites of element production, it has been known that the explosive outbursts from the final hurrah of the life of a massive star would be one of the prime sites for the formation of heavy elements. Until the last decade, most studies of these nucleosynthetic yields used simplistic 1-dimensional models. But in the last decade, scientists have begun to move beyond this spherically symmetric picture, introducing asymmetries in the explosion and incorporating state-of-the-art understanding of the explosion mechanism. We review this recent progress for a variety of core-collapse explosions and discuss how these new insights will shape our understanding of nucleosynthesis in the coming years. [Preview Abstract] |
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