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[en] The parameters of an electric-arc facility for the synthesis of fullerenes and endohedral metallofullerenes are optimized. The resistance of C_6_0 and C_7_0 fullerenes and C_6_0(OH)_3_0 and C_7_0(OH)_3_0 fullerenols against neutron irradiation is studied. It is established that the radiation resistance of the fullerenes is higher than that of the fullerenols, but the radiation resistance of the Gd@C_2_n endometallofullerenes is lower than that of the corresponding Gd@C_2_n(OH)_3_8 fullerenols. The radiation resistance of mixtures of Me@C_2_n(OH)_3_8 (Me = Gd, Tb, Sc, Fe, and Pr) endometallofullerenes with C_6_0(OH)_3_0 is determined. The factors affecting the radiation resistance of the fullerenes and fullerenols are discussed.
[en] This year sees the AINSE/ANBUG Neutron Scattering Symposium reach its tenth anniversary. It seems appropriate that this landmark occurs in the same year that the OPAL reactor reaches its fifth year in operation and allows the Australian neutron scattering community an opportunity to reflect on the remarkable achievements that have been made possible using the world-class facilities that we are so fortunate to have on our doorstep. The AANSS meetings are unique on the annual conference calendar. Rather than focus on a specific scientific discipline, these meetings highlight the diversity of science that can be carried out by firing neutral, sub-atomic particles at 'things'. It is the assortment of 'things' that we all place in the path of neutron beams that adds variety to these meetings and greatly broadens our appreciation of the techniques at our disposal. Talks this year cover topics from welding stress to electromagnons and from membrane fluidity to gas-storing materials. The meeting ensures that there is something for everyone but also allows us to explore areas with which we are much less familiar and broaden our horizons. As has now become normal for this meeting, the sessions are divided into distinct themes: Contrast for Biology, Materials - Oxides, Polymer and Self-Assembly, Chemistry, Biological Membranes, Instrument Concepts, Condensed Matter, Materials — Stress and Strain and Beamline Updates. The meeting also includes the award of the ANBUG prize and the ANBUG AGM which all members are encouraged to attend. The meeting encompasses a range of presenters from those who are well-established in the Australian (and global) neutron scattering community to students and ECRs who are just beginning their careers. What all of these talks and posters have in common is that they highlight excellent scientific achievements that have primarily resulted from OPAL and showcase the wide array of neutron scattering techniques and applications.
[en] The invention is concerned with a collimator for particle beams; its divergent aperture has a symmetry principal axis foreseen to be lined with a radiation source; it is characterized by a multiplicity of parallel layers of a material absorbing the radiation; the layers are adjacent each other along the principal symmetry axis; each layer is materialized by juxtaposition of a same number of mobile blocks, some edges of which are in contact each other and materialize in each layer a bit of the layer thickness characteristic is also the homothetic positioning of the corresponding edges of the homologous blocks of the different layers
[fr]Ce collimateur de faisceau neutronique est a encombrement axial reduit. Selon l'invention, le collimateur est compose d'une pluralite de couches paralleles formees respectivement d'un meme nombre de blocs delimitant entre eux une fenetre formant un troncon de l'epaisseur de l'ouverture totale du collimateur et les moyens d'actionnement des blocs sont agences pour que les dimensions et les positions des differentes fenetres conservent une homothetie par rapport a la source de rayonnement. Avec cet agencement, les plans de joint des blocs d'une couche sont masques par une couche voisine
[en] A curved neutron monochromator composed of 145 small Cu platelets is described. Focusing in the horizontal and vertical directions may be achieved. Compared with a flat monochromator an intensity gain of more than one order of magnitude is observed. A monochromator of this type is mainly used for diffuse scattering work. (author)
[en] We describe a completely adjustable, variable aperture neutron collimator that provides uniform shielding outside the aperture. This aperture can be adjusted smoothly from a square-to-rectangular cross section while maintaining either a uniform or diverging channel. (orig.)