Cosmic rays (CR) constitute high-energy particles that mainly originate outside our solar system. These primary CR interact with interstellar matter to produce secondary CR. The secondary nature of their origin is reflected in the higher abundance of light elements, such as boron (B), in secondary CR relative to the solar system.
Click here for original story, Researchers measure boron flux in high-energy cosmic rays with the CALorimetric Electron Telescope (CALET)
Source: Phys.org