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Browsing by Author "Das, B. P"

Browsing by Author "Das, B. P"

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  • Lifetimes of the metastable D3/2, 5/22 states in Ca+ , Sr+ , and Ba+ 
    Sahoo, B. K; Md. Islam, R; Das, B. P; Chaudhuri, R. K; Mukherjee, D (The American Physical Society, 2006-12)
    Atomic properties involving the low-lying excited D3/2,5/22 states in alkaline-earth-metal ions are of current interest in many different applications ranging from tests of physics beyond the standard model to astrophysics. ...
  • Magnetic dipole hyperfine interactions in 137Ba+ and the accuracies of the neutral weak interaction matrix elements 
    Sahoo, B. K; Gopakumar, G; Chaudhuri, R. K; Das, B. P; Merlitz, H; Mahapatra, U. S; Mukherjee, D (The American Physical Society, 2003-10)
    The relativistic coupled-cluster method is applied to calculate the magnetic dipole hyperfine constant “A” of the 6s1/2, 6p1/2, 6p3/2, and 5d3/2 states of singly ionized barium. After the inclusion of two-body correlation ...
  • Many-body effects in hyperfine interactions in 205Pb+ 
    Sonjoy, M; Sahoo, B. K; Chaudhuri, R. K; Das, B. P; Mukherjee, D (EDP Sciences, 2007-03)
    Ab initio calculations have been carried out to study the magnetic dipole and electric quadrupole hyperfine structure constants of 205Pb+. Many-body effects have been considered to all orders using the relativistic ...
  • Many-body theory of the electric dipole moment of atomic ytterbium 
    Dilip, A; Das, B. P; Perger, W. F; Samal, M. K; Geetha, K. P (Institute of Physics, 2001-08)
    The existence of the permanent electric dipole moment (EDM) of an atom implies the simultaneous violation of parity and time-reversal symmetries. Two experiments based on laser cooling have been proposed to search for the ...
  • Mean-field analysis of quantum phase transitions in a periodic optical superlattice 
    Dhar, A; Singh, Manpreet; Rai, R. V; Das, B. P (American Physical Society, 2011-09)
    We analyze the various phases exhibited by a system of ultracold bosons in a periodic optical superlattice using the mean-field decoupling approximation. We investigate for a wide range of commensurate and incommensurate ...
  • Mercury monohalides: suitability for electron electric dipole moment searches 
    Srinivasa Prasannaa, V; Vutha, A. C; Abe, M; Das, B. P (The American Physical Society, 2015-05)
    Heavy polar diatomic molecules are the primary tools for searching for the T-violating permanent electric dipole moment of the electron (eEDM). Valence electrons in some molecules experience extremely large effective ...
  • A new formulation of the relativistic many-body theory of electric dipole moments of closed shell atoms 
    Latha, K. V. P; Angom, D; Chaudhuri, R. K; Das, B. P; Mukherjee, D (Institute of Physics, 2007-09)
    The electric dipole moments of closed-shell atoms are sensitive to the parity and time-reversal violating phenomena in the nucleus. The nuclear Schiff moment is one such property, it arises from the parity and time reversal ...
  • Nuclear structure effects in parity non-conservation in heavy ions 
    Panda, P. K; Das, B. P (Indian Association for the Cultivation of Science, 2010-07)
    We calculate the binding energy, charge radii in ,129Ba-143Ba and 214Ra-228Ra using the relativistic mean field theory which includes scalar and vector mesons. We then evaluate the nuclear structure corrections to the ...
  • Nuclear-spin-dependent parity-nonconserving transitions in Ba/sup+ and Ra/sup+ 
    Geetha, K. P; Singh, A. D; Das, B. P; Unnikrishnan, C. S (The American Physical Society, 1998-07)
    An experiment to observe parity nonconservation using the \|5p/Sup66s>1/2-->\|5p/Sup65d>3/ 2 transition in Ba/Sup +has been proposed [N. Fortson, Phys. Rev. Lett., 70, 2383 (1993)]. We have carried out relativistic ...
  • Optical frequency standard with Sr+: a theoretical many-body approach 
    Sur, S; Latha, K. V. P; Chaudhuri, R. K; Das, B. P; Mukherjee, D (World Scientific Publishing Co, 2007)
    Demands from several areas of science and technology have lead to a worldwide search for accurate optical clocks with an uncertainty of 1 part in $10^{18}$, which is $10^{3}$ times more accurate than the present day cesium ...
  • An overview of some experimental and theoretical aspects of fundamental symmetry violations in atoms 
    Budker, D; Sahoo, B. K; Angom, D; Das, B. P (Indian Academy of Sciences, 2010-12)
    We present some of the advances in our experimental and theoretical studies of violations in fundamental symmetries in atoms. A part of this work was performed under the auspices of a NSF{DST project. During this period, ...
  • Parity non-conservation in atomic Yb arising from the nuclear anapole moment 
    Singh, A. D; Das, B. P (Institute of Physics, 1999-10)
    The recent experimental observation of the nuclear anapole moment in atomic caesium has confirmed the existence of the nuclear spin-dependent parity non-conserving nucleus-electron interaction. Atomic ytterbium (Yb) is ...
  • Parity nonconservation in ytterbium ion 
    Sahoo, B. K; Das, B. P (American Physical Society, 2011-07)
    We consider parity nonconservation (PNC) in singly ionized ytterbium (Yb+) arising from the neutral current weak interaction. We calculate the PNC electric dipole transition amplitude (E1PNC) and the properties associated ...
  • Permanent electric dipole moment of strontium monofluoride as a test of the accuracy of a relativistic coupled-cluster method 
    Srinivasa Prasannaa, V; Abe, M; Das, B. P (The American Physical Society, 2014-11)
    The permanent electric dipole moment of the X2Σ+ electronic ground state of the strontium monofluoride molecule is calculated using a relativistic coupled-cluster method. Our result is compared with those of other calculations ...
  • Permanent electric dipole moments of alkaline-earth-metal monofluorides: Interplay of relativistic and correlation effects 
    Srinivasa Prasannaa, V; Sreerekha, S; Abe, M; Bannur, V. M; Das, B. P (The American Physical Society, 2016-04)
    The interplay of the relativistic and correlation effects in the permanent electric dipole moments of the X 2Σ+ electronic ground states of the alkaline-earth-metal monofluorides (BeF, MgF, CaF, SrF, and BaF) has been ...
  • Phase diagram of a bosonic ladder with two coupled chains 
    Sethi Luthra, M; Mishra, T; Pai, R. V; Das, B. P (American Physical Society, 2008-10)
    We study a bosonic ladder with two coupled chains using the finite size density matrix renormalisation group method. We show that in a commensurate bosonic ladder the critical on-site interaction ($U_C$) for the superfluid ...
  • Phase separation in a two species Bose mixture 
    Mishra, T; Pai Ramesh, V; Das, B. P (The American Physical Society, 2007-07)
    We study the ground state quantum phase diagram for a two species Bose mixture in a one-dimensional optical lattice using the finite size density matrix renormalization group(FSDMRG) method. We discuss our results for ...
  • Present status of the theory of atomic electric dipole moments 
    Das, B. P (World Scientific, 1995)
    A general introduction to the theory of atomic electric dipole moments is followed by a brief review of the present status of the relativistic many-body calculations. The implications for particle physics of the combined ...
  • Probing CP violation with the electric dipole moment of atomic mercury 
    Latha, K. V. P; Angom, D; Das, B. P; Mukherjee, D (The American Physical Society, 2009-08-21)
    The electric dipole moment of atomic Hg-199 induced by the nuclear Schiff moment and the tensor-pseudotensor electron-nucleus interactions are calculated. For this, we develop and employ a novel method based on the ...
  • Quantum phases of attractive bosons on a Bose-Hubbard ladder with three-body constraint 
    Singh, Manpreet; Mishra, T; Pai, Ramesh V; Das, B. P (The American Physical Society, 2014-07)
    We obtain the complete quantum phase diagram of bosons on a two-leg ladder in the presence of attractive onsite and repulsive interchain nearest-neighbor interactions by imposing the onsite three-body constraint. We find ...

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