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Strangeness production in AA collisions at SIS18 |
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| Authors: | Norbert Herrmann Yvonne Leifels |
| Institution: | 1. School of Engineering, the University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan 2. Department of Electric Engineering, Hosei University, Koganei, Tokyo, 184-8584, Japan 3. School of Science, the University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan 4. Department of Chemistry, Tokyo University of Science, Kagurazaka, Shinjyuku-ku, Tokyo, 162-8601, Japan |
| Abstract: | Aluminium oxides doped with 1% 57Fe were prepared by sol-gel method, and annealed for 3 hours at various temperatures between 550°C and 1100°C. Amorphous phases were obtained below 1000°C, and crystalline α–Al2O3 was formed at 1100°C. Although Al2O3 itself shows diamagnetism, the light doping of Fe ions into aluminium oxide induced a very weak ferromagnetism, but the ferromagnetism disappeared by longer annealing. M?ssbauer spectra were composed of paramagnetic Fe2?+? and Fe3?+? species for samples heated below 750°C, and of paramagnetic Fe3?+? above 850°C, in addition to a magnetic sextet and relaxation peaks of Fe3?+?. The magnetic and quadrupole interactions of the sextet and the relaxation peaks and the density functional calculations suggest that the lightly doped Fe3?+? ions are substituted at Al sites in the Al2O3 lattice. |
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