Collective vibrations in nuclei

Green, A M

doi:10.1088/0034-4885/28/1/305

Cited by 30 publications

(2 citation statements)

References 173 publications

(41 reference statements)

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“…The collectivity of the Giant Dipole Resonance (GDR), one of the most robust modes observed in all nuclei [6], is very well captured in such descriptions [7][8][9]. As a consequence of the repulsive particle-hole residual interaction, the energy peak gets closer to the empirical mass parametrization, E GDR = 80A −1/3 , at almost twice the value associated with the distance between two major shells ω 0 = 41A −1/3 .…”

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confidence: 99%

Collectivity of the pygmy dipole resonance within schematic Tamm-Dancoff approximation and random-phase approximation models

et al. 2015

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Within schematic models based on the Tamm-Dancoff Approximation and the Random-Phase Approximation with separable interactions, we investigate the physical conditions which may determine the emergence of the Pygmy Dipole Resonance in the E1 response of atomic nuclei. We find that if some particle-hole excitations manifest a weaker residual interaction, an additional mode will appear, with an energy centroid closer to the distance between two major shells and therefore well below the Giant Dipole Resonance (GDR). This state, together with the GDR, exhausts all the transition strength in the Tamm-Dancoff Approximation and all the Energy Weighted Sum Rule in the Random-Phase Approximation. Thus, within our scheme, this mode, which could be associated with the Pygmy Dipole Resonance, is of collective nature. By relating the coupling constants appearing in the separable interaction to the symmetry energy value at and below saturation density we explore the role of density dependence of the symmetry energy on the low energy dipole response.

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confidence: 99%

Collectivity of the pygmy dipole resonance within schematic Tamm-Dancoff approximation and random-phase approximation models

et al. 2015

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“…Despite the merits of this method, it has now been superseded by the RP A approximation or related methods (5,7,(61)(62)(63)(64)(65)(66)(67)(68)(69)(70)(71)(72)(73)(74)(75)(76)(77)(78) . Choosing from the many der ivations of the RP A equations, we follow J ancovici & Schiff (70) .…”

Section: Residual Interaction and Collective Vibrationsmentioning

confidence: 99%