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arXiv · 1602.08955

Dipole oscillation modes in light $α$-clustering nuclei

W. B. He·Y. G. Ma·X. G. Cao·X. Z. Cai·G. Q. Zhang
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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.

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W. B. He, Y. G. Ma, X. G. Cao, X. Z. Cai, G. Q. Zhang. 2016-06-11. Dipole oscillation modes in light $α$-clustering nuclei. https://doi.org/10.1103/physrevc.94.014301

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