Dipole oscillation modes in lightα-clustering nuclei

Abstract

The α cluster states are discussed in a model frame of extended quantum molecular dynamics. Different alpha cluster structures are studied in details, such as 8 Be two-α cluster structure, 12 C triangle structure, 12 C chain structure, 16 O chain structure, 16 O kite structure, and 16 O square structure. The properties studied, include as the width of wave packets for different α clusters, momentum distribution, and the binding energy among α clusters. It is also discussed how the α cluster degree of freedom affects nuclear collective vibrations. The cluster configurations in 12 C and 16 O are found to have corresponding characteristic spectra of giant dipole resonance (GDR), and the coherences of different α clusters's dipole oscillation are described in details. The geometrical and dynamical symmetries of α-clustering configurations are responsible for the number and centroid energies of peaks of GDR spectra. Therefore, the GDR can be regarded as an effective probe to diagnose different α cluster configurations in light nuclei.

Direct photon emission and influence of dynamical wave packets in an extended quantum molecular dynamics model

“…On the other hand, the α-clustering phenomenon as a novel nuclear structure has received great attention in recent years. An extended quantum molecular dynamics model [21], as one of a few microscopic transport models which can give α-clusters with a nice computation performance, has succeeded in describing multifragmentation [22], giant dipole resonance [23][24][25][26], photonuclear reactions [27] as well as collective flow and shear viscosity etc [28,29] at Fermi energy. In comparison with the traditional QMD-type model and its many applications [30][31][32][33][34][35][36][37][38][39][40][41], the EQMD model has been improved in some aspects.…”

Anisotropy fluctuation and correlation in central α -clustered C12+Au197 collisions

“…Details about the methodology applied for the initialization of the collision system can be found in Refs. [39,40]. Figure 1 shows the comparison of the normalized nucleon radial density distributions initialized with Woods-Saxon and triangular α-clustering configurations of 12 C in this study.…”

“…The nuclear cluster is one of the essential features of a nuclear system. Systematic studies on the α cluster in light nuclei have been performed for more than 40 years [36][37][38][39][40][41][42][43][44]. Recent studies suggest that the intrinsic structure of light nuclei can be captured by the "snapshots" made in relativistic nuclear collisions by colliding light nucleus on the heavy nuclei target [45].…”

Functional field integral approach to quantum work

“…In this section, we study the SSH model which was originally proposed for electronic transport in polyacety- lene with spontaneous dimerization 54 . Despite its simplicity, the SSH model exhibits a variety of exotic phenomena, such as topological soliton excitation, fractional charge and nontrivial edge states, and has attracted extensive interest in past decades [55][56][57][58][59] . The model Hamiltonian can be written as…”