Pygmy Quadrupole Resonance in Skin Nuclei

Details Pygmy Quadrupole Resonance in Skin Nuclei Pygmy Quadrupole Resonance in Skin Nuclei

2009-10-19

arxiv.org/abs/0910.3487v2

Phys.Lett.B695:174-180,2011

Physics

Nuclear Physics

Nuclear Theory

7 pages, 5 figures, updated figures

Scientific paper

10.1016/j.physletb.2010.11.002

The electric quadrupole response is investigated theoretically by HFB and QPM calculations along the Sn isotopic chain with special emphasis on excitations above the first collective state and below the particle threshold. Depending on the asymmetry, additional strength clustering as a group of states similar to the known PDR mode is found. The spectral distributions and electric response functions are discussed. The transition densities of these Pygmy Quadrupole Resonances (PQR) states are closely related to the neutron excess and showing special features being compatible with an oscillation of the neutron skin against the nuclear core. These features may indicate a new nuclear quadrupole mode connected to the skin configuration.

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