Analyses of 248 Cm fission product ␥-ray coincidence data recorded at Gammasphere have yielded additional information about ␥-ray cascades in Nϭ82 isotones 134 Te and 135 I. New-yrast and near-yrast states in both nuclei have been identified, and they are interpreted as specific shell model excitations.

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The tunnel transitions and capture processes in Ni doped Ge tunnel junctions are investigated. From a comparison of the experimental values for excess current with the theory of tunnelling and capture, the capture cross sections of multi‐charged Ni centres in Ge are determined at 77 °K. Capture cross sections for electrons and holes by negatively charged Ni centres, and for electrons by neutral Ni centres, are found. The values agree satisfactory with those obtained from recombination studies.

The electron effective masses in n‐type GaAs with different concentrations have been determined from Faraday effect measurements at T = 99 and 300°K. The experimentally obtained increase of the electron effective mass with increasing concentration may be interpreted in terms of the non‐parabilicity of the conduction band. Using the experimental values of the electron effective mass and concentration, the electron effective mass at the bottom of the band was calculated. The obtained results are discussed in comparison with the theory and with the results of other authors. The variation of the electron effective mass with temperature is found to be a few per cent and is mainly determined by the temperature variation of the energy gap.

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