How to get information of the scattering nuclei?

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Geant4 Version: 11.0.3
Operating System: CentOS7
Compiler/Version: gcc 11.2.0
CMake Version: 3.24.1

Hi all,
I’m trying to collect information of alpha scattering process in Geant4. In this work I simulated some alpha particles with energy ~MeV in my material. And I want to know which nuclides it
inelastic scattered with. This information is important to realize the physical process, but by collecting information in following methods, I can only get the track information shown in the figure. I would like to ask is there any reconmended way to do this?

auto aTrack = aStep->GetTrack();
const std::vector<const G4Track*>* secondaries = aStep->GetSecondaryInCurrentStep();

image

Thank you!