نتایج جستجو برای: deformed shell model
تعداد نتایج: 2157451 فیلتر نتایج به سال:
In this talk, we would like to present a simple model in which a prominent shell structure emerges for a combination of quadrupole and octupole deformations. We shall then discuss the origin of such a new shell structure in terms of the periodic orbits and their bifurcations. Importance of shell effects for the occurrence of reflection-asymmetric deformed shapes have been lively discussed in va...
Abstract The quasi-SU(3) symmetry, as found in shell modelThe quasi-SU(3) symmetry, as found in shell model calculations [1], refers to the dominance of the single particle plus quadrupole quadrupole terms in the Hamiltonian used to describe well deformed nuclei, and to the subspace relevant in its diagonalization. It provides a very efficient basis truncation scheme. It is shown that a small n...
Introduction: Studies have shown that frictional forces in an acetabular component during the gait cycle may be a contributing factor to acetabular shell loosening.1,2 Recent publications have indicated that metal shell deformation can cause secondary forces attributed to insertion technique of press-fit components.3,4 In addition, it is also recognized that larger diameter femoral heads offer ...
Abstract This is the first part of a two-part article on hyperelastic extended Kirchhoff–Love shell model with out-of-plane normal stress. We present derivation new model, focus mechanics deformation. Accounting for stress distribution in direction affects accuracy calculating deformed-configuration position, and consequently nonlinear response shell. The improvement beyond what we get from acc...
Low-energy dipole (LED) excitations in $^{18}\mathrm{O}$ were investigated using a combination of the variation after $K$ projection framework antisymmetrized molecular dynamics with $\ensuremath{\beta}$ constraint generator coordinate method. We obtained two LED states, namely, ${1}_{1}^{\ensuremath{-}}$ state dominant shell-model structure and ${1}_{2}^{\ensuremath{-}}$ large $^{14}\mathrm{C}...
Acoustic backscattering measurements and associated scattering modeling were recently conducted on a type of benthic shelled animal that has a spiral form of shell (Littorina littorea). Benthic and planktonic shelled animals with this shape occur on the seafloor and in the water column, respectively, and can be a significant source of acoustic scattering in the ocean. Modeling of the scattering...
in this paper, the radial breathing mode (rbm) frequencies of multi-walled carbon nanotubes (mwcnts) are obtained based on the multiple-elastic thin shell model. for this purpose, mwcnt is considered as a multiple concentric elastic thin cylindrical shells, which are coupled through van der waals (vdw) forces between two adjacent tubes. lennard-jones potential is used to calculate the vdw forc...
A semiempirical shell-correction method including ellipsoidal deformations is used to determine binding energies of open-shell, unpolarized HeN clusters. Shell effects, shapes, and other ground-state properties ~like the chemical potential! are determined. HeN clusters are found to be substantially less deformed due to their relatively high surface energy as compared to that of alkali-metal clu...
Superheavy elements owe their existence exclusively to nuclear shell effects which stabilize them against spontaneous fission (SF). Theoretical predictions locate the center of stability at the hypothetical doubly-magic spherical nucleus with Z=114 and N=184 [1]. Calculations with the inclusion of higher orders of deformation [2] suggest the ground state shell correction energy of deformed nucl...
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