## SEARCH

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- Tata Institute of Fundamental Research 13 (%)
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#### Author

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- Balakrishnan, V 3 (%)
- Bangre, B M 3 (%)
- Ingle, S G 3 (%)
- Jha, Sudhanshu S 3 (%)
- Rajasekaran, G 3 (%)

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## On the symmetries between neutrino and antineutrino-nucleon elastic scattering

### Pramana (1978-06-01) 10: 648 , June 01, 1978

## Interaction of a charged extended body with Magnetic field

### Pramana (1978-12-01) 11: 729-732 , December 01, 1978

It is shown that the conventional energy expressions need modification for the interaction of a charged extended body with a magnetic field. It is also shown that the correction term arises as a result of the rotation of the charged extended body about its centre of mass in a magnetic field. This can provide us with an additional source of energy that can be tapped with a suitable energy conversion device.

## Electrical conduction and size effect in bismuth films

### Pramana (1978-08-01) 11: 145-147 , August 01, 1978

The size effect on electrical conduction is observed in bismuth films in the region of film thickness above 2000 Å. Applying Fuchs-Sondheimer theory and assuming specularity parameter*p* = 0·8, the value of bulk resistivity and mean free path are obtained as 6·692 × 10^{4} ohm-cm and 6000 Å respectively.

## Interlattice displacements and elastic constants of the A-15 compounds V3Si, V3Ge and Nb3Sn

### Pramana (1978-03-01) 10: 311-317 , March 01, 1978

General expressions for the interlattice displacements of the A-15 structure compounds are obtained in terms of the strain components making use of the deformation theory. The nature of the interlattice displacements of all the 8 atoms in the unit cell is discussed. It is found that the interlattice displacements occur in such a way that the pair of atoms along any linear chain move in opposite directions with equal magnitudes. Expression for the strain energy of these compounds is developed using deformation theory and this is compared with the strain energy expression from continuum theory to obtain the elastic constants. The theoretical values of the elastic constants fairly agree with the experimental values for V_{3} Si, V_{3}Ge and Nb_{3} Sn.

## Infrared intensity analysis of some MXY2 type molecules

### Pramana (1978-02-01) 10: 207-212 , February 01, 1978

Infrared intensity analysis of MXY_{2} type molecules has been attempted. The dipole moment*μ* of C=O is obtained to be different for different molecules*viz.* for CH_{2}O, 1.9052; for COCl_{2}, 1.1517; for COF_{2}, 0.6340; and for COBr_{2}, 0.7687. Similarly in the case of CSF_{2} and CSCl_{2}*μ*_{C=S} it was found to be 0.2473 and 0.2983 respectively. This shows that the effect of the electro-negative halogen atoms is very important.

## A band-mixing Hartree-Fock model for62Zn

### Pramana (1978-04-01) 10: 375-386 , April 01, 1978

Energy levels and electromagnetic transitions in^{62}Zn have been calculated using band-mixing formalism in the framework of deformed Hartree-Fock theory. Matrix elements of Adjusted-Surface Delta Interaction (ASDI) and of Tabakin interaction have been used. Detailed structure of various nuclear states in terms of bands has been discussed. Although the calculated spectra for both the interactions are somewhat compressed as compared to the observed spectra, the ASDI results are in substantially better agreement with experiments. Several additional states of high spin (*J*>4) have been predicted.*B*(*E*2) transitions between inter-band as well as some of the intraband states are calculated to stimulate further experiments.

## On the alleged equivalence of certain field theories

### Pramana (1978-10-01) 11: 491-506 , October 01, 1978

We critically examine some recent claims that certain field theories with and without boson kinetic energy terms are equivalent. We point out that the crucial element in these claims is the finiteness or otherwise of the boson wavefunction renormalisation constant. We show that when this constant is finite, the equivalence proof offered in the literature fails in a direct way. When the constant is divergent, the claimed equivalence is only a consequence of improper use of divergent quantities.

## Negative muon capture in3He

### Pramana (1978-10-01) 11: 471-477 , October 01, 1978

We compute the partial capture rate of negative muons in^{3}He by following the analysis of Peterson to include the relativistic corrections and the exchange effects, for various values of the*g*_{p}/*g*_{A} ratio. We also calculate the total capture rate. The ground state of^{3}He is assumed to be spherical. The radial dependence of the ground state wave function is taken to be (a) one parameter Irving function, (b) a modified three-parameter Irving function and (c) a function having ‘soft-core’, whose parameters have been fixed in a variational calculation of the binding energy of the triton using a non-local momentum-dependent potential involving*p*^{2} terms. The calculated values of the capture rates are compared with the experimental data to find a value for the*g*_{p}/*g*_{A} ratio.

## A mean-field, effective medium theory of random magnetic alloys I: The random ising model

### Pramana (1978-08-01) 11: 223-232 , August 01, 1978

Starting from a physical RKKY interaction model for magnetic alloys and a valid probabilistic description of a random substitutional alloy, the possible phases have been studied in a mean field, effective medium theory. Most of the detailed objections raised against former treatments of these systems have been removed.

## Shape of spectrum with ensemble of 2-body random hamiltonians

### Pramana (1978-08-01) 11: 205-207 , August 01, 1978

Monte-Carlo calculations in*d-s* shell space have been done using two-body random interactions, to obtain ensemble-average*m*-particle scalar moments up to fourth order. A shift of the spectrum shape from semi-circle to Gaussian with respect to the increase in number of particles can be clearly seen in terms of the ensemble-averaged fourth moment.