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The energy dependence of non-linear dynamical fluctuations in e+e− collisions at high energy is studied using the Monte Carlo method. The Lévy indices μ are measured, and the generalized fractal dimensions D( q) and multi-fractal spectrum f(α) are presented at various energies. It is found that the Lévy index μ distributes within 1 < μ < 2 in consistence with the Lévy stability. It takes approximately the central limit value (μ = 2) at √ s = 40 GeV and decreases with the increasing of the c.m. energy, departing farther and farther away from the central limit. The Rényi dimensions D( q) decrease with increasing q, lying in a narrow band for different energies. The multi-fractal spectrums are convex curves with maximum at q = 0. The maximum moves along the α-axis to the right with the increasing of energy. The fractal dimension D F , i.e. D( q = 0), almost does not change with energy, while the information dimension D I [ D( q = 1)] and the correlation dimension ν [ D( q = 2)] decrease with the increasing of the c.m. energy when √ s < 80 GeV and approach saturation when √ s > 80 GeV. [ABSTRACT FROM AUTHOR]

Temperature induced magnetic phase transition in the interstitial compound LaFe11.6Si1.4C0.2 was studied by zero-field Mössbauer spectroscopy. A paramagnetic doublet and a magnetically split sextet co-existed in the zero-field spectra in the temperature region of 213-218 K, and a thermal hysteresis was observed in the heating and cooling cycles. The spectra indicate that the magnetic phase transition induced by temperature is of first order for this sample. [ABSTRACT FROM AUTHOR]

The random bound mixed compound Fe(Br0.8I0.2)2has been investigated by magnetization and Mössbauer spectroscopy. The experimental results for Fe(Br0.8I0.2)2were compared with those of Fe(Br0.6I0.4)2studied previously. A magnetic structure below the magnetic transition temperature observed by Mössbauer spectroscopy has been suggested which shows a large distribution ofthe hyperfinefields. [ABSTRACT FROM AUTHOR]