## SEARCH

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- Tata Institute of Fundamental Research 15 (%)
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#### Author

##### ( see all 239)

- Khanna, M P 5 (%)
- Ramamurthy, V S 4 (%)
- Verma, Ramesh C 4 (%)
- Choudhury, R K 3 (%)
- Kapoor, S S 3 (%)

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## Charged particle trajectories in a magnetic field on a curved space-time

### Pramana (1977-04-01) 8: 395 , April 01, 1977

## Hadronic final states and sum rules in deep inelastic processes

### Pramana (1977-09-01) 9: 249-256 , September 01, 1977

In order to get maximum information on the hadronic final states and sum rules in deep inelastic processes, we use Regge phenomenology and quarks parton model. The unified picture for the production of hadrons of type*i* as a function of Bjorken and Feynman variables with only one adjustable parameter is formulated. The results of neutrino experiments and the production of charm particles are discussed in sum rules.

## Timelike and null geodesics in the Nordström field

### Pramana (1977-07-01) 9: 71-77 , July 01, 1977

The timelike and null geodesics are investigated in the Nordström geometry and it is found that incoming geodesics always encounter a turning point at a finite radial distance. The limits for escape, bound and stable orbits are obtained and they are closer to the source as compared to their counterparts in the Schwarzschild’s field.

## Cuspidal edges for elastic wave surfaces for cubic crystals

### Pramana (1977-04-01) 8: 348-362 , April 01, 1977

The paper deals with a detailed numerical study of the sections of the inverse and ray velocity surfaces for cubic crystals. The figures for the sections of the inverse and ray surfaces by the (001) and (110) planes have been plotted for over 65 crystals and from these, the nature of the cuspidal edges has been discussed. Typical graphs of the inverse and ray surfaces have been given. The parameters characterising the dimensions of the cusps have been tabulated. It is shown that the A-15 compounds exhibit very unusual and interesting wave surfaces at temperatures below superconducting critical temperatures.

## Velocity gradient driven flute instabilities in plasmas

### Pramana (1977-03-01) 8: 205-213 , March 01, 1977

The effect of velocity gradient across the magnetic field on the low frequency flute modes is examined in detail, using the normal mode analysis. It is shown that some new type of instabilities driven primarily by the velocity*gradient* arise and these excited modes eventually attain the convective saturation. The onset of plasma turbulence due to these instabilities may possibly be one of the major contributors for anomalous heating process and enhanced plasma resistivity.

## A quark-parton description of the deep inelastic scattering processes

### Pramana (1977-08-01) 9: 141-147 , August 01, 1977

A consistent description of various deep inelastic processes in a quark-parton model is presented. The valence quark probability distribution and the form of core quark probability distribution is fixed from the deep inelastic electroproduction data. Langacker and Suzuki prescription is used to fix the*p* and*n* quark core distribution. The differential excitation of quark currents similar to the Harari model of*e*^{+}*e*^{−} annihilation process is invoked in deep inelastic electroproduction and neutrino reactions. An effective phenomenological form of the weak currents associated with new quarks and the associated nucleon structure is determined.

## Neutrino scattering on polarized deuterons

### Pramana (1977-08-01) 9: 119-127 , August 01, 1977

The possible presence of an*I*=0 axial vector piece in the hadronic neutral current may be detected by looking for an asymmetry in the emission of the recoil deuterons in elastic scattering of neutrinos or antineutrinos on polarized deuterons. It is estimated that this asymmetry could be about 40% with the incident neutrinos in the energy range of tens of MeV.

## Anisotropic ferromagnet with biquadratic exchange

### Pramana (1977-03-01) 8: 286-291 , March 01, 1977

A formulation, using the double time Green’s function method, is presented for the anisotropic spin-one ferromagnetic system in the presence of Ising part of the biquadratic exchange and an expression is given for the critical temperature*T*_{c} in terms of two parameters. One is associated with the uniaxial anisotropy (treated exactly) and the other one corresponds to the biquadratic interaction (treated in RPA). The bilinear Heisenberg exchange term is treated in Callen’s approximation emphasizing the role of intersite correlation for small parameters. The prediction that*T*_{c} increases with the biquadratic exchange is found to be consistent with the recent calculation based on high temperature series expansion.

## Radiation effects in calcite

### Pramana (1977-03-01) 8: 266-275 , March 01, 1977

Calcite single crystals on neutron bombardment change their colour to pale red, red and deep red, as the duration of irradiation increases. The irradiated surface becomes rugged and on etching, a large number of micropits are observed. Using Vicker’s hardness indenter, it is observed that the hardress of the irradiated crystal increases with the increase in the total dosage. From Laue x-ray diffraction studies of irradiated crystals, distortion of lattice is observed. Absorption spectra in the visible region show an extra peak for irradiated samples which is absent for radiated ones. The radiation effects are annealed to a considerable extent on heat treatment. The implications are discussed.

## An approximation method for evaluating centrifugal distortion constants in XY2 bent symmetric nonhydride molecules

### Pramana (1977-02-01) 8: 114-116 , February 01, 1977

An approximation method is preser ted for an easier evaluation of centrifugal distortion constants τ_{αβγδ} in XY_{2} bent symmetric ronhydride molecules, employing the known extremal properties of the intramolecular force constants. The formulas for τ_{αβγδ} thus obtained involve only atomic masses, geometry and normal vibrational frequencies of the molecule. The centrifugal distortion constants calculated under this approximation compare very well with experimental values obtained from the microwave spectrum.