neutron-capture processes

Neutron-capture processes are how elements heavier than iron are formed in stars. They involve free neutrons being captured by existing atomic nuclei. In these processes, an atom absorbs a neutron, creates a heavier isotope, and may undergo radioactive decay or further captures, building up heavier elements over time. There are two main types: the slow process (s-process), occurring gradually in aging stars, and the rapid process (r-process), happening quickly during explosive events like supernovae. These processes are essential for creating many of the heavy elements found throughout the universe.