G Ramachandran
Articles written in Pramana – Journal of Physics
Volume 9 Issue 2 August 1977 pp 119-127 Nuclear And Particle Physics
Neutrino scattering on polarized deuterons
M V N Murthy G Ramachandran K V L Sarma
The possible presence of an
Volume 10 Issue 6 June 1978 pp 559-562 Nuclear And Particle Physics
Magnetic contributions to high energy inverse bremsstrahlung process
G Ramachandran R S Keshavamurthy
Magnetic contribution to inverse bremsstrahlung is estimated at high energies. It begins to dominate over the Coulomb contribution in the ratio
Volume 15 Issue 4 October 1980 pp 357-369 Optics
SU(3) representation for the polarisation of light
G Ramachandran M V N Murthy K S Mallesh
A new mathematical representation for discussing the state of polarisation of an arbitrary beam of partially polarised light is described which makes use of the generators of the group SU(3). This representation is sufficiently general to describe not only physical photons which are transverse but also virtual photons. The correspondence between our representation and the conventional Stokes parameter representation is established and this leads to an equivalent geometrical description of partially polarised light in terms of diametrically opposite points on a Poincarè sphere with radius equal to the degree of polarisation. The connection with the spherical tensor representation is also discussed and this leads to a simple geometrical interpretation of the bounds on the parameters characterizing an arbitrary beam of partially polarised light.
Volume 17 Issue 4 October 1981 pp 337-352 Nuclear And Particle Physics
G Ramachandran R S Keshavamurthy K Venkatesh
The state of polarization of the recoil nucleus in
Volume 20 Issue 3 March 1983 pp 221-244 Particle Physics
Weak neutral current effects in elastic electron deuteron scattering
M V N Murthy G Ramachandran S K Singh
We study the effect of weak neutral currents in elastic electron deuteron scattering on both unpolarized and polarized deuteron targets. Theoretical expressions have been derived for the polarized electron asymmetry, polarized target asymmetry and recoil deuteron vector polarization within the framework of impulse approximation. We show that these polarization parameters can give vital information on the space-time and isospin structure of the hadronic weak neutral current. In particular, our numerical estimates show that a measurement of polarized target asymmetry is sensitive to the isoscalar axial vector piece in the hadronic neutral current which, though zero in the Weinberg-Salam model, is not completely ruled out by the data.
Volume 24 Issue 6 June 1985 pp 813-816 Quantum Mechanics
Photon emission from non-oriented spin systems
A method is suggested to determine experimentally whether the state of a spin system is oriented or non-oriented by measuring the angular distribution,
Volume 26 Issue 1 January 1986 pp 43-53 Nuclear Physics
Polarization parameters in systems with spin-spin interactions
The spin-spin interaction of two arbitrary spin systems is considered in some detail. The temporal evolution of the polarization parameters and the correlation parameters has been worked out. Applications of the formalism and the interpretation of the results to processes such as heavy-ion interactions, muon and nuclear repolarization and depolarization in muonic atoms and interactions of multilevel systems are outlined.
Volume 26 Issue 4 April 1986 pp 337-353 Nuclear Physics
Inelastic scattering of pions on^{7}Li
The recent experimental results of Gibson and coworkers, for inelastic scattering of pions on^{7}Li, leading to the first five excited states of^{7}Li are analyzed using a shell model description including configuration admixtures and representing the transition nucleon densities following Helm model, used extensively in the context of inelastic scattering of electrons. With the transition radii for protons and neutrons chosen to be 3.9 fm and 4.1 fm respectively, good fits to the experimental cross sections are obtained. In contrast to the distorted wave Born approximation (
Volume 35 Issue 1 July 1990 pp 67-80
On π
A theoretical study is made of the advantages to be gained in polarizing a deuteron target by applying an external electric quadrupole field with non-zero asymmetry parameter for carrying out
Volume 42 Issue 2 February 1994 pp 97-105
Photon polarisation asymmetries in (
A R Usha Devi A Sudha Rao G Ramachandran
The Stokes parameters characterising the polarization of the photon in the
Volume 45 Issue 4 October 1995 pp 319-326
G Ramachandran A R Usha Devi N S Saandeep Kannada Vardhana
Following the recent work of Chandler
Volume 59 Issue 2 August 2002 pp 175-179
Spin squeezing and quantum correlations
KS Mallesh Swarnamala Sirsi Mahmoud AA Sbaih PN Deepak G Ramachandran
We discuss the notion of spin squeezing considering two mutually exclusive classes of spin-
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