dorsal/arxiv
View SchemaRelativistic description of exotic collective excitation phenomena in atomic nuclei
| Authors | N. Paar, T. Niksic, D. Vretenar, P. Ring |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0407064 |
| URL | https://arxiv.org/abs/nucl-th/0407064 |
| DOI | 10.1142/S0218301305002746 |
Abstract
The low-lying dipole and quadrupole states in neutron rich nuclei, are studied within the fully self-consistent relativistic quasiparticle random-phase approximation (RQRPA), formulated in the canonical basis of the Relativistic Hartree-Bogoliubov model (RHB), which is extended to include the density dependent interactions. In heavier nuclei, the low-lying E1 excited state is identified as a pygmy dipole resonance (PDR), i.e. as a collective mode of excess neutrons oscillating against a proton-neutron core. Isotopic dependence of the PDR is characterized by a crossing between the PDR and one-neutron separation energies. Already at moderate proton-neutron asymmetry the PDR peak is calculated above the neutron emission threshold, indicating important implications for the observation of the PDR in (gamma,gamma') scattering, and on the theoretical predictions of the radiative neutron capture rates in neutron-rich nuclei. In addition, a novel method is suggested for determining the neutron skin of nuclei, based on measurement of excitation energies of the Gamow-Teller resonance relative to the isobaric analog state.
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"abstract": "The low-lying dipole and quadrupole states in neutron rich nuclei, are\nstudied within the fully self-consistent relativistic quasiparticle\nrandom-phase approximation (RQRPA), formulated in the canonical basis of the\nRelativistic Hartree-Bogoliubov model (RHB), which is extended to include the\ndensity dependent interactions. In heavier nuclei, the low-lying E1 excited\nstate is identified as a pygmy dipole resonance (PDR), i.e. as a collective\nmode of excess neutrons oscillating against a proton-neutron core. Isotopic\ndependence of the PDR is characterized by a crossing between the PDR and\none-neutron separation energies. Already at moderate proton-neutron asymmetry\nthe PDR peak is calculated above the neutron emission threshold, indicating\nimportant implications for the observation of the PDR in (gamma,gamma\u0027)\nscattering, and on the theoretical predictions of the radiative neutron capture\nrates in neutron-rich nuclei. In addition, a novel method is suggested for\ndetermining the neutron skin of nuclei, based on measurement of excitation\nenergies of the Gamow-Teller resonance relative to the isobaric analog state.",
"arxiv_id": "nucl-th/0407064",
"authors": [
"N. Paar",
"T. Niksic",
"D. Vretenar",
"P. Ring"
],
"categories": [
"nucl-th"
],
"doi": "10.1142/S0218301305002746",
"title": "Relativistic description of exotic collective excitation phenomena in atomic nuclei",
"url": "https://arxiv.org/abs/nucl-th/0407064"
},
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