High resolution powder neutron diffraction at a low-flux reactor

Complete text of publication follows. The high resolution powder neutron diffractometer, PUS, was installed at the 2 MW JEEP II reactor at Institute for Energy Technology, Kjeller in 1997. Flexibility and optimisation of the relationship between intensity (signal/noise ratio) and resolution were keywords for the design of the instrument [1]. Wavelengths in the range 0.7 - 2.6 A are available from the focussing composite Ge monochromator. Different Soller slit collimators in the incident neutron beam allow either a high resolution or a high intensity mode. The detector system consists of two units position units, each covering 20 deg in 2Θ, and a complete 120 degrees powder pattern are collected from measurements with the detector-units in three different positions. The presentation focus is on some selected examples, like crystal and magnetic structures of metal hydrides, high TC-superconductors and perovskite related oxides, to show the potential of high resolution powder neutron diffraction at a low-flux reactor, like the JEEP II reactor at Kjeller. (author) [1] B.C. Hauback, H. Fjellvag, O. Steinsvoll, K. Johansson, O.T. Buset and J. Jorgensen, to be submitted (1999)