Bulletin of the American Physical Society
2012 Fall Meeting of the APS Division of Nuclear Physics
Volume 57, Number 9
Wednesday–Saturday, October 24–27, 2012; Newport Beach, California
Session NA: r-Process Nucleosynthesis in Explosive Stellar Scenarios |
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Chair: George Fuller, University of California, San Diego Room: Plaza I |
Saturday, October 27, 2012 8:30AM - 9:06AM |
NA.00001: Probing r-process nucleosynthesis in neutron star mergers Invited Speaker: Daniel Kasen One possible site of r-process nucleosynthesis is the violent merger of two neutron stars, in which a small fraction of neutron rich material may be ejected at sub-relativistic speeds. The subsequently radioactive decay of the heavy nuclei should power transient optical emission similar to, but significantly dimmer than, an ordinary supernova. New astronomical surveys will be able to detect such transients, which would provide a remarkable opportunity to directly probe the properties of r-process nuclei soon after they were produced. We discuss the theory of r-process production in mergers, and present numerical simulations which estimate the brightness, duration, and spectroscopic properties of the associated transients. [Preview Abstract] |
Saturday, October 27, 2012 9:06AM - 9:42AM |
NA.00002: Collective neutrino oscillations and r-process nucleosynthesis in supernovae Invited Speaker: Huaiyu Duan Neutrinos can oscillate collectively in a core-collapse supernova. This phenomenon can occur much deeper inside the supernova envelope than what is predicted from the conventional matter-induced Mikheyev-Smirnov-Wolfenstein effect, and hence may have an impact on nucleosynthesis. The oscillation patterns and the r-process yields are sensitive to the details of the emitted neutrino fluxes, the sign of the neutrino mass hierarchy, the modeling of neutrino oscillations and the astrophysical conditions. The effects of collective neutrino oscillations on the r-process will be illustrated using representative late-time neutrino spectra and outflow models. [Preview Abstract] |
Saturday, October 27, 2012 9:42AM - 10:18AM |
NA.00003: New Observational Perspectives on r-process Nucleosynthesis Invited Speaker: Ian U. Roederer Elements heavier than the iron group can be found in nearly every star whose abundances have been studied in detail. More than 60 percent of the naturally-occurring elements between zinc and uranium have been detected in r-process enriched stars. Models of the r-process rely heavily on matching astronomical observations, so this is good news for studies of r-process nucleosynthesis. I will highlight some of what we've learned from three decades of studying r-process material in other stars, describe current efforts that use the Hubble Space Telescope to expand the chemical inventory in r-process environments beyond the Solar system, and note opportunities for complementary studies by the physics community. [Preview Abstract] |
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