Author/Authors :
James ، نويسنده , , M. and Nelson، نويسنده , , A. and Schulz، نويسنده , , J.C and Jones، نويسنده , , M.J. and Studer، نويسنده , , A.J. and Hathaway، نويسنده , , P.، نويسنده ,
Abstract :
A new neutron reflectometer has been built at Australiaʹs 10 MW HIFAR research reactor. The X172 reflectometer operates in a monochromatic, angular dispersive mode collecting reflectivity data as a function of angle. The incident neutron beam is monochromated by a pair of pyrolytic graphite crystals ( λ = 2.43 Å ) before being collimated using a pair of motorised sintered B4C slits. Detection of the reflected neutron beam is via a 10-atmosphere, helium-3, linear position sensitive detector. Examples of data collected using the X172 reflectometer at air-solid and solid-liquid interfaces are given. Neutron reflectivity values as low as 10−5 have been measured on this instrument.
Keywords :
Neutron reflectometer , Pyrolytic graphite monochromator , helium-3 detector , Bragg mirror , Plasma polymer
