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- Behera, S N 4 (%)
- Bhiday, M R 4 (%)
- Bhoraskar, V N 4 (%)
- Gunye, M R 4 (%)
- Peraiah, A. 4 (%)

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## Preface

### Journal of Astrophysics and Astronomy (1980-09-01) 1: 1 , September 01, 1980

## The role of general relativity in astronomy: Retrospect and prospect

### Journal of Astrophysics and Astronomy (1980-09-01) 1: 33-45 , September 01, 1980

## Feynman diagram approach to atomic collisions

### Pramana (1980-09-01) 15: 291-307 , September 01, 1980

A quantum field theoretic formulation of atomic collision phenomena involving non-relativistic free and bound systems is developed and a calculational procedure in terms of Feynman diagrams is prescribed. Matrix elements of several atomic collision processes have been calculated. In most cases standard quantum mechanical results are reproduced. But in some cases new terms appear in the scattering matrix whose contribution though negligibly small in the low energy region, become important at higher energies.

## Helicon-phonon interaction for oblique propagation in potassium

### Pramana (1980-01-01) 14: 1-10 , January 01, 1980

The dispersion equation for oblique propagation of the wave in the*xy* plane for helicon-phonon interaction has been derived and numerical studies have been carried out on the nature of variation of the four different modes with the magnetic field and the inclination of the magnetic field with the direction of propagation.

## Decay characteristics of SrS:Nd phosphors

### Pramana (1980-07-01) 15: 91-95 , July 01, 1980

The phosphorescence decay of a series of strontium sulphide microcrystalline phosphors prepared with varying amounts of neodymium as an activator has been studied at room temperature. The decay obeys the relation*I* =*I*_{0}*t*^{−b} with*b* lying between 0·35 and 0·98. The trap depths have been evaluated by peeling off log*I-t* curves. The results show that the distribution of trap levels is likely to be quasi-uniform and the process of retrapping during luminescence is negligible.

## Coulomb effect in rotating nuclei in the Thomas-Fermi approach

### Pramana (1980-01-01) 14: 97-102 , January 01, 1980

The effect of nuclear Coulomb potential in rotating nuclei has been studied in the Thomas-Fermi approach. The numerical calculations of typical rotating nuclei show that Coulomb potential plays an important role in the rotational mass regions 150–190 and >224.

## A method for constructing radial wave packets with application to target distortion in electron-atom collisions

### Pramana (1980-03-01) 14: 191-199 , March 01, 1980

It has been shown that an analysis of radial stationary state wave functions of a particle in terms of their loops leads to such continuous, single-valued and finite functions which represent a practically convenient form of the radial wave packets of that particle at various positions. The radial wave packets have been used to investigate target distortion in electron-atom collisions. The distortion of the target is defined in terms of quantum-mechanical probabilities given by the wave packets. A closed expression which depends upon the position of the colliding electron, is obtained for the potential energy of the target in the field of the colliding electron.

## Charged particle orbits in Kerr geometry with electromagnetic fields as viewed from locally non-rotating frames

### Pramana (1980-02-01) 14: 113-118 , February 01, 1980

The charged particle orbits in electromagnetic fields on Kerr background as viewed from a locally non-rotating frame do not exhibit non-gyrating bound orbits, which was an essential feature in the earlier study of Prasanna and Vishveshwara, thus showing the non gyration to be due to the effect of dragging of inertial frames produced by the rotating black hole.