Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session 1WA: Frontiers of Nuclear Astrophysics 65 years after B2FH I |
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Chair: Catherine Deibel, Louisiana State University Room: Hyatt Regency Hotel Celestin D-E |
Thursday, October 27, 2022 9:00AM - 9:36AM |
1WA.00001: Prospects for Nuclear Astrophysics Studies with Stable Beams Invited Speaker: Manoel Couder Experimental nuclear astrophysics studies have been performed with stable beams for almost a century. Improved sensitivity, background mitigation techniques, inverse kinematics, indirect studies and more have allowed for experiments to deliver reaction rate estimates with reduced uncertainties. These rates are used to constrain stellar models, especially for quiescent burning scenarios, predicting observables, now including neutrino flux. This talk will present recent studies of stable beam induced nuclear reactions of astrophysics interest. The report on these exciting measurements will lay the ground to a discussion of examples of upcoming investigations with stable beams. |
Thursday, October 27, 2022 9:36AM - 10:12AM |
1WA.00002: Classical Novae and X-ray Bursts Invited Speaker: Wei Jia Ong Explosive hydrogen-rich events such as novae or x-ray bursts are powered by nuclear reactions that occur near or at the proton dripline. These phenomena are some of the most commonly observed explosive stellar events within the galaxy as well as extra-galactically, making them ideal for the comparison between observational data and theoretical models. Though their nucleosynthetic pathways are constrained by the relative proximity of the proton dripline to the valley of terrestrial stability, there are still many unknowns regarding the astrophysical conditions as well as nuclear energetics. In the past several decades, advancements in rare isotope beam production, projectile fragmentation in particular, have allowed the community to experimentally constrain the rates of reactions that occur in novae and x-ray bursts. Concurrently, the vast improvement in computational power has been a game-changer in terms of the fidelity and predictive power of astrophysical models of such events. I will discuss some major achievements in the study of novae and x-ray bursts, outline the current state of knowledge (and lack of knowledge), and present the prospects of the future. |
Thursday, October 27, 2022 10:12AM - 10:48AM |
1WA.00003: Comprehensive Modeling of Core-Collapse Supernovae Invited Speaker: William R Hix For most of its more than 50 year history, modeling of core-collapse supernovae has been focused on the hundreds of milliseconds around the collapse of the iron core, the birth of the proto-neutron star and the launching of the supernova shockwave. While the physics that occurs in this narrow window is essential to the explosion, most of the observations of these supernovae come hours to weeks to years later as the shockwave lifts the envelope of the star and propels this ejecta into the interstellar medium. Further, we are now finding that the final stages of stellar evolution, occurring minutes to hours before the collapse of the iron core, require multi-dimensional modeling as well. To compare our models to the full panoply of observations, and especially to fulfill the promise of multi-messenger astronomy, we need to build comprehensive models of core-collapse supernovae that stretch from the late days of stellar evolution through the explosion and onto the supernova and supernova remnant phases. I will present some preliminary steps toward this objective to illustrate the importance of spanning the entirety of each core-collapse supernova. |
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