Bulletin of the American Physical Society
76th Annual Gaseous Electronics Conference
Volume 68, Number 9
Monday–Friday, October 9–13, 2023; Michigan League, Ann Arbor, Michigan
Session GM1: Don Madison Memorial Workshop: Don H. Madison's Impact on the Field
9:00 AM–5:00 PM,
Monday, October 9, 2023
Room: Michigan League, Henderson
Chair: Allison Harris, Illinois State University; Sandra Quintanilla, University of North Texas; Mark Zammit, Los Alamos National Laboratory
Abstract: GM1.00003 : Fully Differential Study of Non-PCI Higher-Order Contributions to Ionization of Helium by Proton Impact*
9:40 AM–10:15 AM
Presenter:
Michael Schulz
(Missouri University of Science & Technol)
Author:
Michael Schulz
(Missouri University of Science & Technol)
The motivation for this project was to study higher-order effects other than PCI, those involving an interaction between the projectile and the target nucleus (PT interaction). We suppressed PCI by selecting electron energies of 1 and 75.4 eV, which are far from the velocity-matching.
At 1 eV we found that one of the PCI signatures, the forward peak, was absent in the FDCS, but at 75.4 eV it was strongly reduced compared to the velocity-matching regime, but a significant residue remained. The forward shift of the binary peak at 1 eV was as prominent as in the velocity-matching regime and even more pronounced than at 75.4 eV. However, earlier we pointed out that not every forward shift is indicative of PCI, but rather it can be caused by the PT interaction.
The data reveal two separate regimes, one at very small Ee and one in the velocity-matching regime and at large Ee. We interpret these regions as being caused by PCI (velocity-matching) and higher-order effects involving the PT interaction (small Ee), respectively. We thus conclude that at 1 eV the data are dominated by non-PCI higher-order contributions and by PCI at 75.4 eV.
*Work supported by NSF
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