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Poster Session I

4:30 pm – 6:30 pm, Tuesday October 14 Session DT4 COEX, Lobby E
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Excitation of helium by proton impact

Poster 4
Presenter: Liam H Scarlett (Curtin University of Technology)
Authors: Corey Plowman (Curtin University), Dmitry Fursa (Curtin Univ of Technology), Mark Zammit (Los Alamos National Laboratory (LANL)), Igor Bray (Curtin University of Technology)

Calculation of state-resolved excitation cross sections for proton-helium collisions has remained a challenge for many decades. Despite a significant amount of experimental work for some transitions, theory has only been available across limited energy ranges and with inconsistent accuracy. Furthermore, most measurements cover intermediate and high energies, but the data that is available for low energy collisions suggests that the cross sections can be significant in this region.

We have developed a semi-classical version of the Laguerre-based convergent close-coupling (CCC) approach to calculate a comprehensive dataset for excitation cross sections up to n<=5 in proton collisions with ground-state helium. Using a relatively large basis of 2586 target states we obtain convergence in both the state-resolved excitation and electron loss cross sections. The present results agree very well with experiment where available and provide significant improvement over previous calculations. Furthermore, our calculations accurately reproduce the Rosenthal oscillations seen in the experimental data, indicating a high level of accuracy in modelling the underlying physics.

Funding acknowledgement

This research was supported by the Australian Government through the Australian Research Council's Discovery Projects funding scheme (project DP240101184). L.H.S is the recipient of an Australian Research Council Discovery Early Career Researcher Award (project number DE240100176) funded by the Australian Government. M.C.Z would like to specifically acknowledge Los Alamos National Laboratory (LANL) ASC PEM Atomic Physics Project. LANL is operated by Triad National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under Contract No. 89233218NCA000001. This work was supported by resources provided by the Pawsey Supercomputing Centre with funding from the Australian Government and the Government of Western Australia.

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