C L Thaper
Articles written in Pramana – Journal of Physics
Volume 2 Issue 3 March 1974 pp 148-157 Liquids
Dynamics of liquid ammonia from cold neutron scattering
C L Thaper B A Dasannacharya P S Goyal
The scattering of 4.1 Å neutrons by liquid ammonia has been measured at 218 K in the angular range of 30–90° using the Trombay rotating crystal spectrometer. The experimental data, after correcting for multiple scattering, have been compared with model calculations, and it is shown that it is possible to get detailed information about the rotational correlation function on the basis of neutron experiments alone. The model assumes Langevin diffusion for translational motions. Rotational motions are described by means of an orientational correlation function which has a gaseous behaviour for times up to
Volume 2 Issue 4 April 1974 pp 179-188 Solids
B A Dasannacharya P K Iyengar R V Nandedkar K R Rao A P Roy C L Thaper
Phonon frequencies in beryllium along the principal symmetry directions have been determined by means of the slow neutron inelastic scattering technique. The data are analysed in terms of a six-neighbour force constant model and the force constants are evaluated. It is concluded that strong tensor forces are present in beryllium and the importance of this finding to basic theories of lattice dynamics is pointed out.
Volume 6 Issue 6 June 1976 pp 383-387 Liquids
Neutron scattering of cold neutrons from liquid silane at 137° K and 98°K is explained on the basis of a simple model. The rotational diffusion constant,
Volume 23 Issue 3 September 1984 pp 313-319 Instrumentation
High resolution measurement of bragg cut-off in beryllium
C L Thaper P S Goyal B A Dasannacharya
Bragg cut-off for$$(10\bar 10)$$ plane of polycrystalline beryllium of various lengths of 300 and 116 K has been measured with an energy resolution of 5 μeV. The natural width of the cut-off is 12.5±1.5 μeV, independent of temperature and length of beryllium and also of physical characteristics and certain metallurgical treatments of the powder. Such blocks of beryllium would be suitable for designing a Δ
Volume 23 Issue 5 November 1984 pp 559-571 Experimental Techniques
Δ
P S Goyal C L Thaper B A Dasannacharya
A high resolution neutron spectrometer making use of a Δ
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