The physics department is located on a separate campus, together with the department of Mathematics, near the main center of Siegen. Topics dealt with in theory include quantum chromodynamics, gauge theories, critical phenomena, and radiative corrections to electroweak processes. Cosmic ray research with the primary aim to measure the chemical composition of energetic primary cosmic rays and to study the propagation of cosmic rays in our galaxy. Closely related to the propagation of heavy cosmic ray primaries are Interactions of heavy ions with matter. Also problems like the radiation hazard for astronauts and of electronic circuits on long duration missions are investigated.
Nuclear physics is a subject of theoretical research.
The second category on applied research includes the following subjects Application of nuclear physics in medicine and material science. The primary aim of the investigation is to reduce the applied dose in medical diagnosis and treatment and at the same time to improve on spatial resolution, of particular importance for diagnosis in coronary diseases. Analysis of solar energy utilization and energy saving measures for industry and buildings. This includes problems of thermal building physics, development of simulation models as well as improvement and application of various measuring methods.