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Using the method of weighted residuals, a detailed numerical study is made of the neutronics of spherical cold neutron sources composed of liquid hydrogen and liquid deuterium in reactor moderators of light water, heavy water and graphite, Particular attention is paid to the physical effects at the cold source boundary. The computations allow a number of conclusions to be made on the best designs of spherical cold source configurations. It is found that for small spherical sources there is little difference in neutron gain using either normal-hydrogen or para-hydrogen, and that the largest gains are obtainable from large deuterium-filled sources.

The autoionising levels of the sp2 configuration in Ga I , In I and TI I were investigated by photoionisation experiments using the monochromatised synchrotron radiation of the 800 MeV electron storage ring in Berlin (BESSY) and the atomic-beam technique. The widths of the autoionising lines are discussed with respect to the wavefunctions of the corresponding levels.

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