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Benchmarking Atomic Collision Data for Kilonova Modeling Through a Joint Theoretical and Experimental Approach

Presentation #124.04 in the session Laboratory Astrophysics Division (LAD): iPosters.

Published onJul 01, 2023
Benchmarking Atomic Collision Data for Kilonova Modeling Through a Joint Theoretical and Experimental Approach

A neutron star merger event generates heavy elements via the r-process. Following the detection of a merger via gravitational wave interferometry in 2017, interest in using spectroscopy to detect and determine the abundances of heavy elements grew. Current atomic collision data used in models is often produced using semi-classical or semi-empirical methods, such as the van Regemorter approach. The current project aims to use modern theoretical tools (R-matrix or distorted-wave) with experimental benchmarking to produce a self-consistent set of high-resolution atomic data for use in the nebular phase of kilonova modeling.

The benchmarking results are presented for gold and platinum spectral emission from hollow cathode lamps collected with a resolving power ~10,000 over a wavelength range from 200-1500nm. These results are compared with measurements taken in the Compact Toroidal Hybrid plasma experiment at Auburn University as well as with recent R-matrix calculations via collisional-radiative modeling. There is a general trend in improved agreement with spectroscopic observations as one goes from van Regemorter, to distorted-wave, to the R-matrix data.

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