20 research outputs found

    Structure of the icosahedral Ti-Zr-Ni quasicrystal

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    The atomic structure of the icosahedral Ti-Zr-Ni quasicrystal is determined by invoking similarities to periodic crystalline phases, diffraction data and the results from ab initio calculations. The structure is modeled by decorations of the canonical cell tiling geometry. The initial decoration model is based on the structure of the Frank-Kasper phase W-TiZrNi, the 1/1 approximant structure of the quasicrystal. The decoration model is optimized using a new method of structural analysis combining a least-squares refinement of diffraction data with results from ab initio calculations. The resulting structural model of icosahedral Ti-Zr-Ni is interpreted as a simple decoration rule and structural details are discussed.Comment: 12 pages, 8 figure

    A search for doubly charged higgs production in z0 decays

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    Contains fulltext : 124394.pdf (preprint version ) (Open Access

    Search for a scalar top quark using the OPAL detector

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    Contains fulltext : 124482.pdf (preprint version ) (Open Access

    Evidence for chain - like production of strange baryon pairs in jets

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    Contains fulltext : 124372.pdf (preprint version ) (Open Access

    Measurement of the B0 and B+ lifetimes

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    Contains fulltext : 124375.pdf (preprint version ) (Open Access

    A Study of the electric charge distributions of quark and gluon jets in hadronic Z0 decays

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    Contains fulltext : 124406.pdf (preprint version ) (Open Access

    Search for massive, unstable photinos that violate R-parity

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    Contains fulltext : 124384.pdf (publisher's version ) (Open Access

    Observation of exclusive decays of B mesons at LEP

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    Contains fulltext : 124480.pdf (preprint version ) (Open Access
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