From the center of our galaxy, an enormous number of gamma quanta with a characteristic energy is emitted. Most likely, these gamma rays are produced by the annihilation of electrons and their antiparticles the positrons. Researchers discuss different theories to explain the origin of cosmic positron sources. PD Dr. Christoph Hugenschmidt from the Research Neutron Source Heinz Maier-Leibnitz (FRM II) produces positrons in laboratory in order to investigate defects in materials on an atomic scale. The annihilation of positrons with electrons gives information about the type and number of defects in a substance.

Date: 9. October 2012, 7 p.m.
Venue: Vereinsheim, Occamstr. 8 (near Münchner Freiheit)
Admission free

Further information:
www.cafe-und-kosmos.de

Contact:
Petra Riedel, press officer, Research Neutron Source Heinz Maier-Leibnitz (FRM II), Tel. +49 89 289 12141, E-Mail: petra.riedel@frm2.tum.de