What are the details of how neutrons are produced as a result of cosmic ray particles hitting our planet's atmosphere?
For instance, what is the pathway that creates the highest number of neutrons from cosmic ray particles?
The article "Single event upset" states:
An SEU happens due to cosmic particles which collide with atoms in the atmosphere, creating cascades or showers of neutrons and protons. At deep sub-micrometre geometries, this affects semiconductor devices at sea level.
But it does not describe the mechanism.
The Wikipedia article on the neutron states something similar:
Cosmic radiation interacting with the Earth's atmosphere continuously generates neutrons that can be detected at the surface.
What are the processes, in detail?