J. A. Sheikh

Triaxial projected shell model approach

The projected shell model analysis is carried out using the triaxial Nilsson+BCS basis. It is demonstrated that, for an accurate description of the moments of inertia in the transitional region, it is necessary to take the triaxiality into account and perform the three-dimensional angular-momentum projection from the triaxial Nilsson+BCS intrinsic wavefunction.

Fission Barriers of Compound Superheavy Nuclei

The dependence of fission barriers on the excitation energy of the compound nucleus impacts the survival probability of superheavy nuclei synthesized in heavy-ion fusion reactions. In this work, we investigate the isentropic fission barriers by means of the self-consistent nuclear density functional theory. The relationship between isothermal and isentropic descriptions is demonstrated. Calculations have been carried out for 264Fm, 272Ds, ;{278}112, ;{292}114, and ;{312}124. For nuclei around ;{278}112 produced in cold-fusion reactions, we predict a more rapid decrease of fission barriers with excitation energy as compared to the nuclei around ;{292}114 synthesized in hot-fusion experiments. This is explained in terms of the difference between the ground-state and saddle-point temperatures. The effect of the particle gas is found to be negligible in the range of temperatures studied.

Triaxial projected shell model study of chiral rotation in odd-odd nuclei

Abstract Chiral rotation observed in 128 Cs is studied using the newly developed microscopic triaxial projected shell model (TPSM) approach. The observed energy levels and the electromagnetic transition probabilities of the nearly degenerate chiral dipole bands in this isotope are well reproduced by the present model. This demonstrates the broad applicability of the TPSM approach, based on a schematic interaction and angular-momentum projection technique, to explain a variety of low- and high-spin phenomena in triaxial rotating nuclei.

Exploring the Origin of Nearly Degenerate Doublet Bands in Ag 106

The lifetimes of the excited levels for the two nearly degenerate bands of

Systematic Study of Fission Barriers of Excited Superheavy Nuclei

^{106}mathrm{Ag}

Quadrupole collective inertia in nuclear fission: Cranking approximation

have been measured using the Doppler-shift attenuation method. The deduced

Multi-phonon γ-vibrational bands in odd-mass nuclei studied by triaxial projected shell model approach

B(E2)

Temperature-induced pair correlations in clusters and nuclei

and

Isospin-invariant Skyrme energy-density-functional approach with axial symmetry

B(M1)

Investigation of doublet-bands in 124,126,130,132Cs odd–odd nuclei using triaxial projected shell model approach

rates in the two bands are found to be similar, except around the band crossing spin, while their moments of inertia are quite different. This is a novel observation for a nearly degenerate doublet band.