Which secondary particles from cosmic rays can reach sea level?

When primary cosmic rays collide with nuclei in Earth's atmosphere, they produce secondary particles that can be observed at sea level. These secondary particles include:1

• Neutrons: Fragments resulting from the collision of primary particles with atmospheric nuclei.12
• Muons: Short-lived subatomic particles created from the energy of these collisions. Some muons possess such high energy that they can penetrate deep into the Earth.13
• Electrons and Photons: These are also produced as part of extensive air showers (EASs) generated by very high-energy primary particles.2

While primary cosmic rays themselves are not directly observed at the surface, these secondaries reach ground level, where they can be detected by various instruments.123