Abstract:
The exact nucleosynthesis processes and sites for heavy-element productions in our universe remain a mystery for decades. Heavy-element nucleosynthesis is normally expected to be associated with extreme astrophysical conditions involving compact objects, such as core-collapse supernovae or binary neutron star mergers (NSM) that are also multi-messenger events.
Here I will discuss works on probing the heavy-element nucleosynthesis in supernovae and neutron star mergers using the astrophysical observables of prompt electromagnetic emissions, long-lived abundance yields as well as live isotopes. First, we describe a possible NSM electromagnetic signal due to the MeV gamma rays produced from the decays of the r-process species synthesized as well as from a specific isotope Tl-208. Such a signal holds the promise to be a distinct signature of the production of heavy species. I will also summarize works on heavy-element nucleosynthesis abundance yields, discussing the possible impacts of neutrino interactions on the heavy-element nucleosynthesis yields in supernovae are explored both for the proton-rich side and neutron-rich side. Lastly, I will show our work on the calculation of the abundances of the live r-process radioisotopes produced from near-earth supernovae and neutron star mergers and the impact of the measurements of interesting isotopes, like Fe60, Pu244, etc., in constraining the possible near-earth r-process event.
Biography:
Xilu Wang is the associate professor at the Institute of High Energy Physics, Chinese Academy of Sciences. Her current research mainly focus on nuclear astrophysics and gamma-ray astronomy. She got the B.S. degree in physics from Wuhan University, China in 2011, and obtained her PhD in astronomy at University of Illinois at Urbana-Champaign. Then she worked as the N3AS (Network for Neutrinos, Nuclear Astrophysics, and Symmetries) Postdoctoral Fellow at the University of California, Berkeley and the University of Notre Dame. She joined the Institute of High Energy Physics in 2021 and was selected into the National young talents project in 2022.
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