Hybrid random-phase-approximation–cluster model for the dipole strength function ofLi11

Role of the pygmy resonance in the synthesis of heavy elements with radioactive beams

“…, the case in "Li. The pygmy resonance in this latter nucleus is found to occur at =2 MeV [5,6]. A pure cluster model supplies slightly different results from those of Ref.…”

Pigmy resonances, transfer, and separable potentials

“…Fancy density functional models are now being used to describe collective states in nuclei such as the timedependent superfluid local density approximation [5,6,7] and pigmy resonances are often being studied using mean field theories [8,9,10,11,12,13,14]. Slight modifications of the linear response theory allows the prediction of a considerable concentration of the excitation strength in neutron-rich nuclei at low energies [15,16]. The theoretical prediction of the fraction of the sum rule exhausted by pigmy resonances depends on the use of non-relativistic or relativistic mean field approaches, pairing properties, and other physical phenomena [11,12,13,14,15,16,17].…”

Excitation of soft dipole modes in electron scattering

“…those based on random phase approximation (RPA) calculations [51,52] are necessary to tackle this problem. The halo nucleons have to be treated in an special way to get the response at the right energy position, and with approximately the right width [49,52]. The problem remains if the peak in figure 5 is due to a direct transition to the continuum, weighted by the phase space of the fragments, or if it proceeds sequentially via a soft dipole collective state.…”

“…Better microscopic models, e.g. those based on random phase approximation (RPA) calculations [59,60] are necessary to study pigmy resonances. The halo nucleons have to be treated in an special way to get the response at the right energy position, and with approximately the right width [57,60].…”

“…those based on random phase approximation (RPA) calculations [59,60] are necessary to study pigmy resonances. The halo nucleons have to be treated in an special way to get the response at the right energy position, and with approximately the right width [57,60]. Electron scattering will provide a unique opportunity to clarify this issue due to its better resolution over Coulomb excitation.…”