Vidya Devi

Search for low-spin identical bands in light Xe-Gd nuclei

The excitation energies of ground and gamma bands belonging to F0 spin multiplets of Xe-Gd nuclei are found to be constant. The pair conjugates nuclei with the same F-spin and ?F0 values also have identical NpNn values. The smooth dependence of moment of inertia and function of valence proton and neutron number [f(NpNn)] give the existence of low-spin identical bands in this region. A correlation ansatz to identify such nuclei based on the concepts of NpNn and F-spin is also discussed.

Triaxial rotor model for the study of the nuclear structure and transition between different symmetries in nuclei for A = 120-200 mass region

The rigid triaxial rotor model used to search the dependence of and on the mixing effect of asymmetric parameter (γ) and mixing angle (τ). The dependence of γ and deformation parameter (β) on the energy ratio (R4/2) is discussed. It can be found that the calculated energy, B(E2) values have reasonable agreement with the experimental energy, B(E2) values and B(E2) ratios.

The odd-even staggering in 122–124Xe and 124–128Ba nuclei

The γ-band energy staggering in low-spin, low-energy spectra of even-even 122–124Xe and 124–128Ba nuclei are discussed. The energy levels of ground and gamma band are calculated by the Soft Rotor Formula (SRF). The staggering is a function of spin has been analyzed in order to derive the information on the type of triaxiality present in 122–124Xe and 124–128Ba nuclei. The staggering indices of γ-soft and triaxial nuclei are also calculated by this SRF formula. It is found that these staggering indices have opposite signs and provide clear distinction between γ-soft and triaxial nuclei.

Study of triaxiality in Xe-Hg nuclei

The β and γ0 deformation parameters of even-even, Xe-Hg nuclei have been calculated in the frame work of rigid triaxial rotor model of Davydov and Filipov. The deformation parameters β and γ0 follow the smooth trajectories against the p-factor (p=NpNn/(Np + Nn)). The smooth variation between deformation parameter and p-factor is shown by dividing the Xe-Hg nuclei i.e. Z=50-82, N = 82-126 in to four quadrants (Q) viz. quadrant I and III for p-p and h-h bosons, and II, IV are h-p and p-h bosons respectively.

Interacting boson model-1 calculations for even-even 122–132 Xe and 126–136 Ba nuclei

In this study, we present the calculations of energy levels and B(E2) values of 122–132 Xe and 126–136 Ba nuclei using the Interacting Boson Model (IBM-1). Using the best fitted values of the parameters in the Hamiltonian of the IBM-1 we have calculated energy levels and B(E2) values for a number of transitions in 122–132 Xe and 126–136 Ba nuclei. Results are compared with the experimental data and other theoretical models. It has turned out that the IBM is fairly reliable for the calculation of spectra in the entire set of 122–132 Xe and 126–136 Ba nuclei.

Two-parameter formula for ground-band energy spectra of A = 120-200 mass region nuclei

This paper presents a two-parameter formula which works best for an Anharmonic Vibrator (AHV), i.e., soft and rigid rotor nuclei in the A = 120-200 mass region. A comparison with the other two-parameter formulae, i.e., ab, Brentano Soft Rotor Formula (SRF), Ejiri and Variable Moment of Inertia (VMI) model, shows that this formula gives a better fit with the experimental data.