The electron-neutrino angular-correlation coefficient was determined by measuring the shape o f the proton recoil spectrum from free-neutron decay. The protons leaving a highly evacuated tangential reactor beam tube were analyzed by a spherical condenser spectrometer and counted in an ion-electron converter detector. The design of the apparatus, the possible disturbing influences, and the measures to reduce their effects are discussed. The remaining corrections were either calculated or determined by auxiliary measurements and applied to the spectral shape. The sources of systematic errors are considered and included in the final results. We obtained a = -0.1017 +0.0051 giving /g,/g,l = 1.259 + 0.017.-

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Diffuse neutron scattering in fl-PdD x (for x = 0.710, 0.742, 0.754 and 0.780) was observed around the 1 1 0X* ,~, j point in reciprocal space in the temperature range between 50 and 150 K. The detailed shape of the diffuse pattern is dependent on the deuterium concentration for x between 0.71 and 0.742 and nearly independent for higher concentrations. An increase of the diffuse intensities was found when cooling down the samples to 50 K and was associated with the anomaly of the resistivity. During an annealing treatment in PdD0.780 at 70 and 75 K, superlattice reflections appeared at tt47,7,2 ,,Jn~* and equivalent positions whose intensity after 53 h was 2% of the intensity of the 200 Bragg reflection of the sublattice.

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