S Kumar
Articles written in Pramana – Journal of Physics
Volume 9 Issue 1 July 1977 pp 87-92 Atomic Physics
Glauber amplitudes for transitions from low lying states in hydrogen atom by charged particle impact
The Glauber amplitudes for the general transition
Volume 11 Issue 5 November 1978 pp 559-568 Statistical Physics
Scaling hypothesis, relativistic statistics and critical mass of dwarf stars
Assuming that field theoretic Green’s functions scale, expressions for correlation function, number density, pressure are obtained for a relativistic statistical many-body system. The scaling parameter is related to anomalous dimension and is a measure of interaction. The effect of this interaction on the critical mass of dwarf stars is studied and is not found to be insignificant. A mass radius relation is deduced. The Chandrasekhar limit is reproduced in the limit of non-interaction.
Volume 32 Issue 4 April 1989 pp 419-433 Nuclear Reactions
Clustering phenomena in radioactive and stable nuclei and in heavy-ion collisions
S S Malik S Singh R K Puri S Kumar Raj K Gupta
A theory for clustering formation in nuclei and in heavy-ion collisions has been worked out in terms of the quantum-mechanical fragmentation process. Treating the mass fragmentation and relative separation coordinates as weakly coupled, the spontaneous cluster-decay of radioactive nuclei has been considered as a two-step process of clustering formation and tunnelling of the confining nuclear interaction barrier. This model has also been applied to “stable” nuclei, lighter than lead. The effects of adding more and more neutrons to colliding
Volume 33 Issue 2 August 1989 pp 277-287 Particle Physics
Confinement of tensor gluons — a classical approach
We look at the confinement of tensor gluons (
Volume 33 Issue 2 August 1989 pp 289-296 Particle Physics
A confinement model of hadron with its constituent quarks bound in a strong gravitational field is presented. The gravitational field plays the role of a medium having, as if, space dependent permeabilities from a fixed centre. The massless Dirac equation modified by the gravitational field is solved. The solution for the wavefunction of the quarks obtained shows the characteristic features of confinement, i.e., (i) wavefunction with higher energy states lying closer to the centre, (ii) equispaced energy levels without continuum, (iii) the quark orbits lying within a distance ∼ 10^{−14} cm, the characteristic radius of a typical hadron.
Volume 35 Issue 1 July 1990 pp 35-48
Confinement model for quarks and gluons is formulated. An attempt has been made to derive the dielectric function starting from a Lagrangian that also determines the quark and gluon field equations. Deconfinement mechanism is also discussed.
Volume 67 Issue 5 November 2006 pp 849-860
Working group report: Flavor physics and model building
M K Parida Nita Sinha B Adhikary B Allanach A Alok K S Babu B Brahmachari D Choudhury E J Chun P K Das A Ghosal D Hitlin W S Hou S Kumar H N Li E Ma S K Majee G Majumdar B Mishra G Mohanty S Nandi H Pas M K Parida S D Rindani J P Saha N Sahu Y Sakai S Sen C Sharma C D Sharma S Shalgar N N Singh S Uma Sankar N Sinha R Sinha F Simonetto R Srikanth R Vaidya
This is the report of flavor physics and model building working group at WHEPP-9. While activites in flavor physics have been mainly focused on
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