S K Khosa
Articles written in Pramana – Journal of Physics
Volume 68 Issue 6 June 2007 pp 1013-1018 Brief Reports
A microscopic study of deformation systematics in 154−166Dy isotopes
Amita Dua Arun Bharti S K Khosa
The Hartree–Bogoliubov (HB) framework of calculations has been applied for calculating various nuclear structure quantities for 154−166Dy mass chains. In this framework, the intrinsic quadrupole moments, the low-lying yrast states ($E_{2}^{+}$ and $E_{4}^{+}$) and occupation numbers for various shell model orbits have been obtained. The calculated results indicate that the observed onset of deformation in going from 154Dy to 166Dy arises due to enhanced occupation of $(h_{11/2})_{\pi}$ orbit, increased polarization of $(d_{5/2})_{\pi}$ orbit and increase in the occupation of down-slopping $`k'$ components of $(i_{13/2})_{v} and $(h_{9/2})_{υ}$ orbits.
Volume 70 Issue 5 May 2008 pp 817-833 Research Articles
Microscopic insight in the study of yrast bands in selenium isotopes
Parvaiz Ahmad Dar Sonia Verma Rani Devi S K Khosa
The yrast bands of even-even selenium isotopes with $A = 68-78$ are studied in the framework of projected shell model, by employing quadrupole plus monopole and quadrupole pairing force in the Hamiltonian. The oblate and prolate structures of the bands have been investigated. The yrast energies, backbending plots and reduced $E2$ transition probabilities and 𝑔-factors are calculated and compared with the experimental data. The calculated results are in reasonably good agreement with the experiments.
Volume 73 Issue 4 October 2009 pp 657-668
Anil Chandan Suram Singh Arun Bharti S K Khosa
Variation-after-projection (VAP) calculations in conjunction with Hartree–Bogoliubov (HB) ansatz have been carried out for $A = 98–106$ strontium isotopes. In this framework, the yrast spectra with $J^{\Pi} \geq 10^{+}$ , $B(E2)$ transition probabilities, quadrupole deformation parameter and occupation numbers for various shell model orbits have been obtained. The results of the calculation for yrast spectra give an indication that it is important to include the hexadecapole–hexadecapole component of the two-body interaction for obtaining various nuclear structure quantities in Sr isotopes. Besides this, it is also found that the simultaneous polarization of $p_{3}/2$ and $f_{5}/2$ proton subshells is a significant factor in making a sizeable contribution to the deformation in neutron-rich Sr isotopes.
Volume 74 Issue 4 April 2010 pp 525-539 Research Articles
Structure of negative parity yrast bands in odd mass 125-131Ce nuclei
Arun Bharti Suram Singh S K Khosa
The negative parity yrast bands of neutron-deficient 125-131Ce nuclei are studied by using the projected shell model approach. Energy levels, transition energies and $B(M1)/B(E2)$ ratios are calculated and compared with the available experimental data. The calculations reproduce the band-head spins of negative parity yrast bands and indicate the multi-quasiparticle structure for these bands.
Volume 80 Issue 6 June 2013 pp 953-970
Microscopic study of positive-parity yrast bands of 224−234Th isotopes
The positive-parity bands in 224−234Th are studied using the projected shell model (
Volume 83 Issue 3 September 2014 pp 341-363
Study of neutron-rich Mo isotopes by the projected shell model approach
Gopal Krishan Rawan Kumar Rani Devi S K Khosa
The projected shell model (PSM) calculations have been performed for the neutron-rich even–even 102−110Mo and odd–even 103−109Mo isotopes. The present calculation reproduces the available experimental data on the yrast bands. In case of even–even nuclei, the structure of yrast bands is analysed and electromagnetic quantities are compared with the available experimental data. The 𝑔-factors have been predicted for high spin states. For the odd-neutron nuclei, the structures of yrast positive- and negative-parity bands are analysed and found to be in reasonable agreement with the experiments for ${}^{103−107}$Mo. The disagreement of the calculated and observed plots for energy staggering quantity clearly establishes the occurrence of sizable triaxiality in ${}^{103,105}$Mo and also predicts a decrease in the quantum of triaxiality with increasing neutron number and angular momentum for odd mass neutron-rich Mo isotopes.
Volume 96, 2022
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