Dear All,

Can someone please give a bit details about the physics process “CoupledTransportation” particularly in hadronic interactions( high energetic neutron-induced reactions). Is it wise to kill the particle immediately if they interact via this process or it will bias the simulation outputs? Thank you so much in advance.

Best regards,

You have a parallel world in your geometry. CoupledTransportation is the {{Transportation}} process, with support for also handling volume boundaries in the parallel world.

Nothing “interacts” in Coupled Transportation. If you see that process as the “step limiting process” it just means that your track reached a volume boundary.

Dear @mkelsey , Thank you for the explanation. However, I see that there are influence of the CoupledTrasportation process on energy deposition spectra (different spectra in amplitude when we use this process or not reading the variable from tree). However, it just influences the amplitude, not the shape of the spectra. Can you please let me know how one can disable completely the inclusion of this process.
Thank you.

Have you read the section in the Application Developer’s Guide on physics processes?

When you look at a step and see which process limited the step, that is not the only process involved. For charged particles, there is also continuous energy loss (dE/dx) which is always applied. So you’ll see charged tracks with non-zero energy deposit even if they were limited by transportation.

Thank you for your pointers.