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Chandannagar, India

Ganguly S.,Chandernagore College | Dey A.,Variable Energy Cyclotron Center | Banerjee P.,Saha Institute of Nuclear Physics | Bhattacharya S.,Saha Institute of Nuclear Physics | And 4 more authors.
Brazilian Journal of Physics | Year: 2011

Excited states of 83Kr, populated in the 76Ge(11B, 3npγ) reaction at a beam energy of 50 MeV, have been studied. The ΔI = 1 band, built upon the 2,510.0 keV state, has been observed up to 5,639.4 keV with spin (27/2-). Mean lifetimes have been measured up to spin 23/2-- in ΔI = 1 band using the Doppler shift attenuation method. The B(M1) rates derived from the measured lifetimes decrease smoothly with spin indicating that the angular momentum belonging to this band are generated by the shears mechanism. © 2011 Sociedade Brasileira de Física. Source

We quantify multiparticle quantum entanglement in a system of N two-level atoms interacting with a squeezed vacuum state of the electromagnetic field. We calculate the amount of quantum entanglement present among one hundred such two-level atoms and also show the variation of that entanglement with the radiation field parameter. We show the continuous variation of the amount of quantum entanglement as we continuously increase the number of atoms from N = 2 to N = 100. We also discuss that the multiparticle correlations among the N two-level atoms are made up of all possible bipartite correlations among the N atoms. © 2016, Springer Science+Business Media New York. Source

Ghorai A.,Chandernagore College
Defect and Diffusion Forum | Year: 2012

A brief sketch of different models for the calculation of defect parameters in metals and alloys, comparison of data and limitations has been reviewed here; especially relaxations due to a vacancy type of point defect, its formation, migration, activation energies and related other parameters based upon the present experimental status. The models reviewed are the Bond model, Continuum model, Semi-discrete model, Jellium model, Thermodynamic model, Lattice Statics model, Atomistic Continuum model and Pseudopotential model. The main thrust concerns the last model. The Taylor, Vashishta and Singwi, Harrison, Kleinmann and King and Kutler form of exchange and correlation function are almost similar, give moderate results and may be trusted for better results. © (2012) Trans Tech Publications, Switzerland. Source

Banerjee P.,Saha Institute of Nuclear Physics | Ganguly S.,Chandernagore College | Pradhan M.K.,Saha Institute of Nuclear Physics | Sharma H.P.,Banaras Hindu University | And 3 more authors.
Physical Review C - Nuclear Physics | Year: 2011

The two ΔI=1 bands in In111, built upon the 3461.0 and 4931.8 keV states, have been studied. The bands were populated in the reaction Mo100(F19,α4nγ) at a beam energy of 105 MeV. Mean lifetimes of nine states, four in the first and five in the second band, have been determined for the first time from Doppler shift attenuation data. The deduced B(M1) rates and their behavior as a function of level spin support the interpretation of these bands within the framework of the shears mechanism. The geometrical model of Machiavelli has been used to derive the effective gyromagnetic ratios for the two bands. © 2011 American Physical Society. Source

Ganguly S.,Chandernagore College | Banerjee P.,Saha Institute of Nuclear Physics | Dey A.,Variable Energy Cyclotron Center | Bhattacharya S.,Saha Institute of Nuclear Physics
Pramana - Journal of Physics | Year: 2011

In the present work, the excited states of 113Sb were populated in the 100Mo(20Ne, p6n) reaction at a beam energy of 136 MeV. States only up to 59/2̄ were observed in the δJ = 2 band. Mean lifetimes for the five states (from 4460 to 7998 keV) were measured for the first time using Doppler shift attenuation method. An upper limit of the lifetime (0.14 ps) was estimated for the 9061 keV, 47/2̄ state. The B(E2) values, derived from the present lifetime results, correspond to a large quadrupole deformation of β2 = 0.32. The observed reduction in the experimental B(E2) values for the 918.4 keV (spin 39/2̄ → 35/2̄) and 985 keV (spin 43/2. → 39/2̄) transitions may be interpreted as due to the proton alignement in the g7/2 orbital. The dynamic moment of inertia was observed to be about half of the rigid body value at the highest observed frequency. © Indian Academy of Sciences. Source

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