Shape transition and collective excitations in neutron–rich 170-178Yb Nuclei

Energy levels, B(E2) values and potential energy surface for even-even 170-178Yb isotopes have been calculated using the IBM-1. The predicted energy levels, B(E2) values and intrinsic quadrupole moments Q0 results were reasonably consistent with the experimental data. The contour plot of the potential energy surfaces shows all interest nuclei were deformed and have rotational characters

Structure and electronic properties of substitutionally doped Cycloheptane molecule using DFT

AbstractA density functional theory (DFT) has been carried out of the calculation molecular structure of Cycloheptane molecule (C7H14) with Gaussian 09 and Gaussian view 5.08 programs. The effects of the substitution Silicon atom in place of the Carbon atom and substituting the one Hydrogen atom by one hydroxyl (OH) were performed using DFT at B3LYP level with CC-PVDZ basis set. The optimized structure, ionization potential, electron affinity, energy gap, electronegativity, total energies, force constant, reduces mass, Raman spectral, electrostatic potential surface and electron density surface were calculated. The results showed decrease in energy gaps, increases in the electron affinity, and discusses the effect of the substitution for all properties

Description of energy levels and decay properties in 158Gd nucleus

In this paper, IBM-1 and IBM-2 with a SU(3) limit are used to describe the 158Gd isotope. The calculations of energy levels in the ground state, beta-, and gamma-bands are made up, which account for 15 energy levels. However, we found that the energy states of the same spin of the beta- and vibrational bands become degenerate states. In breaking the SU(3) dynamical symmetry by introducing a value of pairing interaction, the degeneracy is lifted and the energy levels are brought up to the same order as the experimental ones

A correspondence between IBA-1 and IBA-2 Models of even isotopes of Sm

The level scheme of the 148,150,152,154,156,158Sm isotopes have been investigated using both IBA-1 and IBA-2 versions of Interacting Boson Approximation Model. IBA-1 and IBA-2 Hamiltonian parameters are obtained as well as the extraction of the energy levels. Also, the electric quadrupole transition probabilities ( 2 : ) i f B E J → J of the Sm isotopes were calculated. In calculations, the theoretical energy levels and the electric quadrupole transition probabilities have been obtained by using PHINT code. Good agreement was found from comparison between the calculated energy levels and the electric quadrupole transition probabilities B(E2) of the Sm isotopes with the experimental data

Determination of the 108-112Pd isotopes identity using interacting boson model

Energy levels, B(E2) transition probabilities and potential energy surface for palladium isotopes with proton number Z = 46 and neutron numbers (n) between 62 and 66 have been calculated through the interacting boson model. The set of parameters used in these calculations are the best approximation that has been carried out so far. The ratio of the excitation energies of the first 4+1 and the first 2+1 excited states, R = E4+1/E2+1, is also calculated and an achievable degree of agreement has been investigated in O(6) symmetry for 108-112Pd nuclei. The comparison between the calculated energy levels and the transition probabilities B(E2) with those of the experimental show that it is a good agreement. The contour plot of the potential energy surfaces shows all nuclei of interests are deformed and have γ-unstable-like characters

Low–lying states of 184W and 184Os nuclei

The energy levels, transition energy, B(E2) values, intrinsic quadrupole moment Q0 and potential energy surface for even-even 184W and 184Os nuclei were calculated using IBM-1. The predicted energy levels, transition energy, B(E2) values and intrinsic quadrupole moment Q0 results are reasonably consistent with the experimental data. A contour plot of the potential energy surfaces shows that two interesting nuclei are deformed and have rotational characters

Low–lying states of odd nuclei in the south–west 204Pb region

Binding energy of the ground state, energy levels and the B(E2) values of both positive and negative parities for 203,205Au, 203,205Hg, 203-207Tl and 203-207Pb isotopes have been calculated through shell model calculations using the shell model code OXBASH for Windows by employing the Modified Kuo-Herling interaction (khhe) for neutron and proton hole orbits in 208Pb. The binding energy calculations were in good agreement with experimental data. The predicted low-lying levels (energies, spins and parities) and B(E2) values results were reasonably consistent with the available experimental data

Shell model calculations on even nuclei near 208Pb

Binding energy of the ground state, energy levels and the B(E2) values of both positive and negative parities for 202,204Au, 202-206Hg, 202-206Tl and 202-206Pb isotopes have been calculated through shell model calculations using the shell model code OXBASH for Windows employing the Modified Kuo-Herling interaction (khhe) for neutron and proton hole orbits in 208Pb. The binding energy calculations were in good agreement with experimental data. The predicted low-lying levels (energies, spins and parities) and B(E2) values results were reasonably consistent with the available experimental data. Truncation model space was applied on the 202Au isotope, where πg7/2 and νh9/2 kept filling as well as νh9/2 for 202Hg and 202Tl

Correspondence between phenomenological and IBM-1 models of even isotopes of Yb

Energy levels and the reduced probability of E2– transitions for ytterbium isotopes with proton number Z = 70 and neutron numbers between 100 and 106 have been calculated through phenomenological (Ph.M.) and interacting boson (IBM-1) models. The predicted low-lying levels (energies, spins and parities) and the reduced probability for E2– transitions results are reasonably consistent with the available experimental data. The predicted low-lying levels (gr–, β1– and γ1– band) by produced in the Ph.M. are in good agreement with the experimental data comparison with those by IBM-1 for all nuclei of interest. In addition, the phenomenological model was successful in predicted the β2–, β3–, β4–, γ2– and 1+– band while it was a failure with IBM-1. Also, the 3+– band is predicted by the IBM-1 model for 172Yb and 174Yb nuclei. All calculations are compared with the available experimental data