Kernphysik, or nuclear physics, is the branch of physics that studies atomic nuclei and their interactions. It explores the forces that hold the nucleus together, the behavior of protons and neutrons, and the processes of nuclear reactions. This field is essential for understanding phenomena such as radioactivity and nuclear fission, which are crucial for both energy production and medical applications. Research in Kernphysik has led to significant advancements, including the development of nuclear power plants and medical imaging techniques like PET scans. Scientists in this field also investigate the fundamental forces of nature, contributing to our understanding of the universe and the creation of elements in stars.