First measurements with the Munich 2D-ACAR spectrometer on Cr

Hubert Ceeh, Josef Weber, Christoph Hugenschmidt, Michael Leitner, Peter Böni

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The Munich 2D-ACAR spectrometer at the Maier-Leibnitz accelerator laboratory in Garching has recently become operational. In the present implementation a 2D-ACAR spectrometer is set up, with a baseline of 16.5 m, a conventional 22Na positron source and two Anger-type gamma-cameras. The positrons are guided onto the sample by a magnetic field generated by a normal conducting electromagnet. The sample can be either cooled by a standard closed-cycle-cryostat to low temperatures or heated by a resistive filament to temperatures up to 500 K. We present the key features of this new 2D-ACAR spectrometer and, in addition, discuss first measurements on the pure metal system Cr. The 2D-ACAR measurements have been performed on Cr at different temperatures: at 5 K and at room temperature in the anti-ferromagnetic phase and at 318K slightly above the paramagnetic phase transition.

Original languageEnglish
Article number012094
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - 2013
Event16th International Conference on Positron Annihilation, ICPA 2012 - Bristol, United Kingdom
Duration: 19 Aug 201224 Aug 2012


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