--- NEWS ---

World record: Unprecedented Intensity of Low-Energy Positrons at the Positron Beam Facility NEPOMUC ¹

At the beginning of 2008, a new in-pile Gamma-converter and Pt-moderator were installed at the neutron induced positron source NEPOMUC. The intensity of the 1 keV positron beam amounts to 9.0±0.8 · 10⁸ moderated positrons per second and is hence the world highest intensity of a mono-energetic positron beam reported so far. 

Up to now, no degradation of the positron source yield has been observed for several weeks of operation. Thus, the long-term stability of the positron beam enables experiments with high reliability. Presently, four spectrometers are connected to the high-intensity positron beam in order to perform a large variety of experiments in surface and solid state physics, materials science and nuclear physics.the 1 keV positron beam amounts to 9.0±0.8 · 10⁸ moderated positrons per second and is hence the world highest intensity of a mono-energetic positron beam reported so far.

[1] Unprecedented intensity of a low energy positron beam; C. Hugenschmidt, B. Löwe, J. Mayer, C. Piochacz, P. Pikart, R. Repper, M. Stadlbauer, and K. Schreckenbach; Nucl. Instr. Meth. A (2008), available online:doi:10.1016/j.nima.2008.05.038

NEPOMUC at FRM II:

NEPOMUC (Neutron induced Positron source Munich) is the worlds strongest source of mono-energetic positrons. The intensity of this positron source is up to four orders of magnitude higher than at lab-based positron beams. Besides the much lower measurement time this beam allows a new class of positron experiments with improved energy or time resolution. Therefore, new insights become realizable in a variety of experiments in solid state physics, material science, surface science and in fundamental physics of anti-matter.We encourage highly motivated students to work in our research group as diploma students. In order to get an overview about current topics in positron physics and open positions please visit our experiments and Open Positions or contact us by e-mail.