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Browsing by Author "Ramachandran, G"

Browsing by Author "Ramachandran, G"

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  • Phase matrices for higher multipoles of scattering in external magnetic fields 
    Oo, Y. Y; San, P. P; Sampoorna, M; Nagendra, K. N; Ramachandran, G (Astronomical Society of the Pacific, 2009-06)
    Scattering phase matrices for forbidden lines are derived, in the presence of an external magnetic field, using the quantum electrodynamical approach. The particular case of 0 -> 2 -> 0 M2 transitions are considered and ...
  • Photodisintegration of polarized deuterons at astrophysical energies 
    Ramachandran, G; Oo, Y. Y; Shilpashree, S. G (IOP Publishing, 2006-05)
    A model independent irreducible tensor formalism, developed earlier for np fusion, is extended to discuss photodisintegration of the deuteron at astrophysical energies. It is shown that target analyzing powers at teta = ...
  • Photon polarization in np fusion 
    Ramachandran, G; Deepak, P. N; Kumar, S. P (Institute of Physics Publishing Ltd., 2003-06)
    A model-independent irreducible tensor formalism is developed to discuss photon polarization in np fusion. It is shown that photon polarization arising out of the interference of the dominant isovector M1 amplitude at ...
  • Polarization of line radiation in the presence of external electric quadrupole and uniform magnetic fields 
    Oo, Y. Y; Nagendra, K. N; Ananthamurthy, S; Vijayashankar, R; Ramachandran, G (Elsevier B.V., 2004-02)
    The polarization of emission lines formed in a medium immersed in external electric and magnetic fields is studied. The electric field is assumed to be quadrupolar in nature, while the magnetic field is uniform. We show ...
  • Polarization of line radiation in the presence of external electric quadrupole and uniform magnetic fields: II. Arbitrary orientation of magnetic field 
    Oo, Y. Y; Nagendra, K. N; Ananthamurthy, S; Sirsi, S; Vijayashanka, R; Ramachandran, G (Elsevier B.V., 2005-02)
    In continuation of our earlier investigation (referred to hereafter as part I) where we considered the mathematically simple case of magnetic field orientation along the Z-axis of the principal axes frame (PAF) of the ...
  • Radiative Capture of Polarized Neutrons by Polarized Protons 
    Ramachandran, G; Deepak, P. N (World Scientific Publishing, 2004-06)
    A model-independent irreducible tensor approach is presented for the np fusion reaction. Appropriate spin-observables are identified to determine empirically the initial spin singlet and triplet contributions to the ...
  • Scattering polarization in the presence of magnetic and electric fields 
    Oo, Y. Y; Sampoorna, M; Nagendra, K. N; Ananthamurthy, S; Ramachandran, G (Elsevier Ltd, 2007-11)
    The polarization of radiation by scattering on an atom embedded in combined external quadrupole electric and uniform magnetic fields is studied theoretically. Limiting cases of scattering under Zeeman effect, and Hanle ...
  • Singlet and triplet differential cross sections for pp-->ppπ0 
    Deepak, P. N; Ramachandran, G (The American Physical Society, 2002-02)
    The singlet and triplet differential cross sections for pp-->ppπ0 have been estimated for the first time at 325, 350, 375, and 400 MeV using the results of the recent experimental measurements [Phys. Rev. C 63, 064002 ...
  • Spin squeezing and quantum correlations 
    Mallesh, K. S; Sirsi, S; Sbaih, M. A. A; Deepak, P. N; Ramachandran, G (Indian Academy of Sciences, 2002-08)
    We discuss the notion of spin squeezing considering two mutually exclusive classes of spin-s states, namely, oriented and non-oriented states. Our analysis shows that the oriented states are not squeezed while non-oriented ...
  • Spin-Dependence of Meson Production in NN Collisions 
    Deepak, P. N; Hanhart, C; Ramachandran, G; Vidya, M. S (World Scientific Publishing Company, 2005-01)
    We present here a model-independent irreducible tensor approach to meson production in NN collisions, which leads to a spin-structure of the T-matrix valid at all energies together with exact partial-wave expansions for ...
  • Squeezing of a coupled state of two spinors 
    Devi, A. R. U; Mallesh, K. S; Sbaih, M. A. A; Nalini, K. B; Ramachandran, G (Institute of Physics Publishing Ltd., 2003-05-16)
    The notion of spin squeezing involves a reduction in the uncertainty of a component of the spin vector vecS below a certain limit. This aspect has been studied earlier (Mallesh et al 2000a <A article="0305-4470/33/4/310">J. ...
  • Tensor polarization of ω produced at threshold in p–p collisions 
    Ramachandran, G; Balasubramanyam, J; Shilpashree, S. P; Padmanabha, G (Institute of Physics, 2007-04)
    It is shown that the dominant decay mode of \vec\omega \to \pi^+ \pi^- \pi^0 can be employed to determine the Fano statistical tensor t20 of \vec \omega with respect to the quantization axis normal to the decay plane. ...
  • Unified approach to photo- and electro-production of mesons with arbitrary spins 
    Ramachandran, G; Vidya, M. S; Balasubramanyam, J (Indian Academy of Sciences, 2007-01)
    A new approach to identify the independent amplitudes along with their partial wave multipole expansions, for photo- and electro-production is suggested, which is generally applicable to mesons with arbitrary ...
  • ω production in pp collisions 
    Ramachandran, G; Vidya, M. S; Deepak, P. N; Balasubramanyam, J; Venkataraya (The American Physical Society, 2005-09)
    A model-independent irreducible tensor formalism that was developed earlier to analyze measurements of p→p→→ppπ° is extended to present a theoretical discussion of p→p→→ppω and of ω polarization in pp→ppω→ and in pp→→ppω→. ...

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