Volume 29, Issue 5
November 1987, pages 1-521
pp 1- November 1987 Rapid Communications
Josephson effects have been observed in bulk samples of Y-Ba-Cu-O. The magnitude of the zero-voltage current is found to change systematically with externally applied small magnetic fields of a few mG. It is also found to vary when samples are irradiated with microwaves. These observations suggest the presence of inter-grain Josephson junctions.
pp 437-453 November 1987 Quantum Mechanics
The unitary representations of the Euclidean and Poincaré groups are analysed, using viewpoints suggested by the method of sections, as applied to the monopole problem, and by the method of induced representations.
pp 455-460 November 1987 Quantum Mechanics
The impact broadening by charged electron gas is calculated. A proper account of the Debye screening has been taken as also the curvilinearity of the perturber’s trajectories. The results have been given in the form of graphs for a ready comparison with earlier results.
pp 461-467 November 1987 Statistical Physics
Using laser transmission, the characteristics of hydrodynamic turbulence is studied following one of the recently developed technique in nonlinear dynamics. The existence of deterministic chaos in turbulence is proved by evaluating two invariants viz. dimension of attractor and Kolmogorov entropy. The behaviour of these invariants indicates that above a certain strength of turbulence the system tends to more ordered states.
pp 469-483 November 1987 Particle Physics
The hyperon form factors obtained by using lattice quantum chromodynamics have been used in the Chou-Yang model in conjunction with the proton form factor obtained by parametrization of the experimental data including the most recent results to obtain differential cross-sections of hyperon-proton elastic reactions. The agreement with available experimental data verifies lattice QCD results at low momentum transfers.
pp 485-490 November 1987 Nuclear Physics
A simple experimental technique has been described for measuring range and energy-loss of any heavy ion in any complex medium with the help of a sensitive solid state nuclear track detectors (SSNTDs). In this paper we present the results obtained from our measurements of ranges and energy-loss of 16.34 MeV/u238U in Makrofol-N using CR-39 track detector. Experimental ranges are compared with the corresponding theoretical values. The significance and scope of the present work are discussed.
pp 491-496 November 1987 Molecular Physics
The redundancy-free internal valence force field (RFIVFF) of acetonitrile is reported using CNDO/force method. The initial force field is set up by taking the interaction and bending force constants from CNDO force field and transferring stretching force constants from the force fields of chemically related molecules. The final force field is obtained by refining the initial force field using vibrational harmonic frequencies of CH3CN,13CH3CN, CH313CN, CH3C15N, CD3CN and CD313CN. The final force field thus obtained is found to be excellent on the basis of frequency fit and potential energy distribution.
pp 497-507 November 1987 Molecular Physics
Following a sequential two-photon excitation, fluorescence is observed from several selectively excited single rotational-vibrational energy levels of theE3π0g+ state of molecular iodine. The re-emittedE →B fluorescence spectrum from each of the populated rovibrational level of theE state consists of a series of sharp lines terminating on the various discrete ro-vibrational levels of theB state and a few broad lines due to transitions taking place on to the continuum of theB state. The point of transition from sharp lines to broad features in the fluorescence spectrum has been utilized to determine theB state dissociation limit. This method of obtaining the dissociation limit of the molecular electronic states appears to be quite simple and straightforward.
pp 509-516 November 1987 Condensed Matter Physics
The spin-correlation length is used to set up a RG analysis of the Hubbard model (within RPA). We demonstrate that an identical critical behaviour is obtained by performing the macroscopic renormalization group analysis with the antisymmetric Landau interaction parameter. The beta functions for the half-filled and quarter-filled band cases have been evaluated.
pp 517-521 November 1987 Condensed Matter Physics
Mössbauer experiments have been carried out on natural crystals of staurolite at room temperature. The spectrum has been resolved into four doublets. From the intensity ratios of the quadrupole split doublets, the angles of the direction cosines of the electric field gradient for every site are determined when the gamma rays are parallel toa, b andc-axis of the crystal.
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