MLZ is a cooperation between:

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MLZ (eng)

Lichtenbergstr.1
85748 Garching

Positrons

Low mass and adjustable kinetic energy makes the positron a probe perfectly suited to solid state research. As the anti-matter particle of the electron, positrons annihilate electrons with a characteristic lifetime. The emerging annihilation radiation provides detailed information of the local surroundings at the annihilation site. As an example, the positron life time is slightly larger in vacancy-like defects than in the unperturbed crystal lattice. In this way, vacancy concentrations as low as 1:107 can be detected.

The high intensity beam of positrons is generated by pair production from absorbed high-energy gamma-rays. This source is positioned in the cusp of the beam tube SR11, where these gamma-rays are produced by the absorption of neutrons in a cadmium layer. The pair-conversion itself occurs in proximate platinum foils. The positrons are extracted by means of electric and magnetic fields and guided to several experimental stations attached to the positron beam facility of NEPOMUC.

Instrument

Description

Operated by

NEPOMUC

Neutron induced positron source Munich

TUM, UniBW München

CDBS

Coincident Doppler-broadening spectrometer

TUM

PAES

Positron annihilation induced Auger-electron spectrometer

TUM

PLEPS

Pulsed low energy positron system

UniBW München

SPM

Scanning positron microscope

TUM, UniBW München

Where are the instruments?

MLZ Instrument Suite MLZ Instrument Suite MLZ Instrument Suite

MLZ is a cooperation between:

Technische Universität München> Technische Universität MünchenHelmholtz-Zentrum Geesthacht> Helmholtz-Zentrum GeesthachtForschungszentrum Jülich> Forschungszentrum Jülich