Results 1 - 10 of 179
Results 1 - 10 of 179. Search took: 0.027 seconds
|Sort by: date | relevance|
[en] Approximation of description of non-axial hexadecapole deformations of heaviest nuclei, used for a long time in the past, is tested. A large, 5-dimensional deformation space is used for that. The analysis is done within a macro-micro approach. Two superheavy nuclei ("2"62"Sg and "2"8"4114), for which non-axial hexadecapole deformations are important, are considered. It is shown that the approximation is not good. The reason for its inadequacy is given. (author)
[en] A systematic study of the contribution of hexadecapole deformations to the enhancement of subbarrier fusion cross reactions is carried out. The analysis is based on calculations that cover the full range of values of hexadecapole deformations found in actual nuclear systems. The interplay of this shape degree of freedom with the presence of prolate quadrupole deformations is also contemplated. (Author)
[es]Se lleva a cabo un estudio sistematico de la contribucion de las deformaciones hexadecapolares nucleares en reacciones de fusion por debajo de la barrera coulombiana. El analisis esta basado en calculos que cubren todo el rango de valores de deformaciones hexadecapolares presentes en sistemas nucleares reales. Tambien se considera la relacion de este grado de libertad de forma con la presencia de deformaciones cuadripolares prolados. (Autor)
[en] Potential energy of the superheavy nucleus "2"8"4114 is analyzed in a 6-dimensional deformation space. This space includes two quadrupole, three hexadecapole and one multipolarity-6 deformation parameter. The energy is minimized simultaneously in all 6 degrees of freedom. The analysis is done within a macroscopic-microscopic approach. As in the studies of other superheavy nuclei, the result is found to be very individual for a given nucleus. A more general feature is a small effect of one (γ_4) of the hexadecapole deformation parameters on the energy of the nucleus. (author)
[en] We obtain the electronic quadrupole and hexadecapole moments of the Ni II ground state to be -0.493 au and 0.204 au using relativistic configuration interaction methodology. These results are in good agreement with available experimental results. Apparently this is the first time an electronic hexadecapole moment has been calculated for an atom.
[en] Recently, the power spectrum (PS) multipoles using the Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 12 (DR12) sample are analyzed . The based model for the analysis is the so-called TNS quasi-linear model and the analysis provides the multipoles up to the hexadecapole . Thus, one might be able to recover the real-space linear matter PS by using the combinations of multipoles to investigate the cosmology . We provide the analytic form of the ratio of quadrupole (hexadecapole) to monopole moments of the quasi-linear PS including the Fingers-of-God (FoG) effect to recover the real-space PS in the linear regime. One expects that observed values of the ratios of multipoles should be consistent with those of the linear theory at large scales. Thus, we compare the ratios of multipoles of the linear theory, including the FoG effect with the measured values. From these, we recover the linear matter power spectra in real-space. These recovered power spectra are consistent with the linear matter power spectra.
[en] The quantized Hamiltonian is derived from the general parametric form of the hexadecapole Vibration in the space of parameter, which maybe important to analyze properties of nuclear structure
[en] The α-cluster model of Brink is used as a variational function for Nilsson's Hamiltonian. The limit of zero cluster separation is shown to correspond to shell model configurations. Expressions for the form factor, quadrupole and hexadecapole moments are derived and compared with experiment. The cluster functions are expanded analytically in terms of deformed oscillator functions. The results indicate the existence of a certain degree of α clustering in the intrinsic ground state of 20Ne. (author)
[en] In Hartree-Fock calcualtions using nonrelativistic and relativistic models we see a change in sign from positive to negative of the hexadecapole moment with mass number around A=170. Analysis of Hartree-Fock orbitals shows that a group of neutron orbits with large negative hexadecapole moments occur together at the Fermi surface near N=100 and are responsible for the shape change