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SiPM-based veto detector for the pion beam at FOPI |
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| Authors: | Gamal Ahmed Pual Bühler Olaf Hartmann Johann Marton Ken Suzuki Johann Zmeskal |
| Institution: | 1. School of Physics, University of KwaZulu-Natal, Durban, 4041, South Africa 2. School of Physics, University of the Witwatersrand, WITS, Johannesburg, 2050, South Africa 3. iThemba LABS, Somerset West, 7129, Western Cape, South Africa 4. Institue of Solid State Physics, University of Jena, 07743, Jena, Germany 5. Department of Physics and Astronomy, Aarhus University, 8000, Aarhus, Denmark |
| Abstract: | Conversion electron M?ssbauer Spectroscopy measurements have been made on ZnO single crystals implanted with 60?keV 57Fe to 4 and 8 at.% peak concentrations, and annealed up to 800°C. The spectra show quite strong changes with annealing, but no evidence of magnetic components, thus precluding the formation of large sized precipitates or secondary phases. Above an annealing temperature of 650°C, the dominant spectral component is a doublet with hyperfine parameters typical of Fe3?+?, which is attributed to Fe3?+? ions in nano-precipitates ～5?nm in size. |
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