C S Warke
Articles written in Pramana – Journal of Physics
Volume 5 Issue 5 November 1975 pp 268-273 Nuclear And Particle Physics
Energy moments of scattering phase shift for partly non-local momentum dependent interaction
The phase shift sum rules recently derived by Puff are extended for a general partly non-local momentum dependent potential. In achieving this, one must use Fredholm determinant of the outgoing solution of the Schrodinger equation instead of the Jost function as was done by Puff. The constants appearing in the moment relations are explicitly defined in terms of the momentum representation of the interaction.
Volume 15 Issue 5 November 1980 pp 449-461 Nuclear And Particle Physics
Microscopic band-mixing calculations in^{154,156}Gd
S V Moholkar C S Warke M R Gunye
A many-body microscopic band-mixing formulation of variation after projection of angular momentum and conservation of nucleon number is used to study the yrast band and first excited
Volume 17 Issue 5 November 1981 pp 369-380 Nuclear And Particle Physics
Microscopic study of odd-
S V Moholkar C S Warke M R Gunye
The odd-proton nucleus^{155}Tb and odd-neutron nucleus^{155}Dy are studied along with doubly-even nucleus^{156}Dy using microscopic method of variation after projection of angular momentum and conservation of nucleon number in each projected state. The calculated energies of the ground band in^{156}Dy and the ground and excited bands in^{155}Dy and^{155}Tb are in good agreement with the corresponding experimental data. The role played by the
Volume 22 Issue 3-4 March 1984 pp 247-255 Particle Physics
Baryon number violating nuclear decay
The expressions for baryon number violating nuclear partial decay widths are derived from the interactions as predicted by grand unified theories. Theory predicts that the baryon number violating proton decay inside the nucleus is hindered relative to the free proton decay rate. In the case of closed shell nuclei, the meson spin-isospin dependence of the partial width is the same as that for the nucleon decay. The branching ratios of decay amplitudes depend on the nuclear binding energies. Nuclear structure introduces lepton energy spread of ±49.5 MeV for light closed shell nuclei, while it does not affect the back to back emission of lepton-meson pair.
Volume 23 Issue 2 August 1984 pp 165-174 Nuclear And Particle Physics
S V Moholkar C S Warke M R Gunye
The energy spectra of the even-parity (
Volume 24 Issue 1-2 January 1985 pp 69-76 Particle Physics
Isobaric degrees of freedom in nuclei as determined from nonrelativistic quark model
Isobaric degrees of freedom δδ in nuclei are determined from the quark cluster model of a nucleus. These additional degrees of freedom are brought in by the coloured quark exchange between different nucleon clusters present in nuclei. They are found to be important in the region of momentum transfer near 3.5 fm^{−1}. The mass dependence of these isobaric degrees of freedom in nuclei turns out to be
Volume 25 Issue 6 December 1985 pp 695-712 Atomic And Molecular Physics
Elastic-scattering cross-section for electrons and positrons from atomic hydrogen
V L Narasimham A S Ramachandran C S Warke
The differential cross-sections of atomic hydrogen for elastic scattering of electrons and positrons have been rederived with the help of a method using a single parameter-dependent unitary shift operator for the calculation of the direct contribution. When the parameter approaches zerc the new method leads to the well-known conventional Glauber results. The numerical calculations include polarization effects and the exchange corrections obtained according to alternative approximation methods. Results calculated with Franco’s exchange show a definite improvement over the earlier results for medium energy electrons at large angles of scattering. Total elastic cross-sections have been calculated for 50 and 100eV electrons and positrons.
Volume 26 Issue 4 April 1986 pp 373-377 Liquids
Microscopic theory of soliton propagation in^{4}He films
A microscopic theory has been provided for propagation of solitons in superfluid^{4}He films at temperature
Volume 32 Issue 4 April 1989 pp 541-547 Sub-Nuclear Physics
Electric and magnetic polarizabilities of nucleon and QCD quark models
The experimental and theoretical work carried out on electric and magnetic polarizabilities of a nucleon is reviewed. The results of an exactly solvable one-dimensional chiral bag model predicts correct signs and order of magnitudes of polarizabilities supporting the approximations used in their realistic calculations.
Volume 38 Issue 1 January 1992 pp 37-49
Field localization and particle confinement effects on pair creation by Schwinger’s mechanism
Solutions of the Dirac equation in the presence of a static uniform electric field
Volume 39 Issue 1 July 1992 pp 27-35 Research Articles
Schwinger’s effective lagrangian from reflection and transmission amplitudes
The reflection and transmission amplitudes are defined from the asymptotic form of the solution of Dirac equation of a charged fermion in the presence of uniform time independent external electromagnetic field (
Volume 53 Issue 2 August 1999 pp 279-288
Nuclear magnetic moment: Relativistic mean field description
Valence nucleon effective mass, which is almost constant, is proposed within the relativistic mean field theories of finite nuclei (closed shell ± one nucleon). It acquires a slight spin-orbit splitting due to relativistic effects. The relativistic Dirac magnetic moment $$\vec \mu _{op} $$ is rewritten analytically in terms of angular momentum-Pauli spin coupled states and the effective mass. Introducing the nucleon effective charge, the iso-scalar and iso-vector corrections to the magnetic moment operator are extracted from the overall one parameter fit of the measured and the calculated values. The calculated values of magnetic moments are in overall fair agreement with the experiment as well as with the other detailed microscopic calculations.
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