[en] We optimize the nuclear parameterization for the description of Ne isotope in the deformed Skyrme–Hartree–Fock model, and succeed in providing an overall good description of the nuclear deformation in this model, which is consistent with the available experimental data and microscopic model results. The addition of a Λ hyperon, based on a realistic Nijmegen hyperon–nucleon potential, is found to have no large effect on the shape of the isotopic nuclei, indicating that the neon isotopic nuclei might not be good candidates for studying the deformation effect of hyperon in future experiments. (author)

[en] The interaction between background species and an underexpanded supersonic jet has been studied. The total species densities were measured using the electron beam fluorescence technique. The skimmed species flux was measured by mass spectrometry. The experimental flow conditions spanned the range from a molecular scattering regime to the near continuum limit. The technique was applied to an investigation of the separation of gas and isotopic mixtures, particularly neon isotopes

[en] A comprehensive study of the pressure dependence of the separation efficiency ratio for separating neon isotopes by gaseous diffusion through well-defined capillary and parallel plate geometries has been made. This study was made to investigate the accuracy of the Present and deBethune theory for binary gas separation by gaseous diffusion. The Knudsen number varied from about 50 to 0.1. The results show that the theory in its present form does not very accurately represent the data. However, an empirical modification has been made to account for real gas properties such as wall-scattering law deviations, flow rate pressure dependence, and geometry variations; this modification represents a fairly accurate interpolation equation for the data. There are also implications that the Clausing calculation for free molecule flow does not accurately represent the momentum transport at the wall

[en] Data from the annihilation of positrons (from a 22-Na source) in neon isotopes is presented. Experimental procedures are discussed

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[en] In a rotating neon plasma, centrifuging should produce separation of Ne20 and Ne22 isotopes. Isotope separation was measured by extracting a sample of gas from the plasma region, and analysing it using a mass spectrometer. The sample is extracted using a fast-acting gas valve which opens for 150 μsec. This allows time-resolution during the life of the plasma, which is of several milliseconds duration. The dependence of isotope separation on various parameters was investigated and changes in isotopic ratio of 20 per cent were observed. Results are compared with a simple equilibrium model based on observed electrical probe voltages and spectroscopic temperature measurements. As well as centrifugal separation, diffusive separation occurs in gas flow through the fast-acting valve, producing a small change in neon isotopic ratio. This effect is allowed for in isotope separation predictions. (author)

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[en] Short Communication