dorsal/arxiv
View SchemaExotic modes of excitation in atomic nuclei far from stability
| Authors | N. Paar, D. Vretenar, E. Khan, G. Colo |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0701081 |
| URL | https://arxiv.org/abs/nucl-th/0701081 |
| DOI | 10.1088/0034-4885/70/5/R02 |
| Journal | Rept.Prog.Phys.70:691-794,2007 |
Abstract
We review recent studies of the evolution of collective excitations in atomic nuclei far from the valley of $\beta$-stability. Collective degrees of freedom govern essential aspects of nuclear structure, and for several decades the study of collective modes such as rotations and vibrations has played a vital role in our understanding of complex properties of nuclei. The multipole response of unstable nuclei and the possible occurrence of new exotic modes of excitation in weakly-bound nuclear systems, present a rapidly growing field of research, but only few experimental studies of these phenomena have been reported so far. Valuable data on the evolution of the low-energy dipole response in unstable neutron-rich nuclei have been gathered in recent experiments, but the available information is not sufficient to determine the nature of observed excitations. Even in stable nuclei various modes of giant collective oscillations had been predicted by theory years before they were observed, and for that reason it is very important to perform detailed theoretical studies of the evolution of collective modes of excitation in nuclei far from stability. We therefore discuss the modern theoretical tools that have been developed in recent years for the description of collective excitations in weakly-bound nuclei. The review focuses on the applications of these models to studies of the evolution of low-energy dipole modes from stable nuclei to systems near the particle emission threshold, to analyses of various isoscalar modes, those for which data are already available, as well as those that could be observed in future experiments, to a description of charge-exchange modes and their evolution in neutron-rich nuclei, and to studies of the role of exotic low-energy modes in astrophysical processes.
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"abstract": "We review recent studies of the evolution of collective excitations in atomic\nnuclei far from the valley of $\\beta$-stability. Collective degrees of freedom\ngovern essential aspects of nuclear structure, and for several decades the\nstudy of collective modes such as rotations and vibrations has played a vital\nrole in our understanding of complex properties of nuclei. The multipole\nresponse of unstable nuclei and the possible occurrence of new exotic modes of\nexcitation in weakly-bound nuclear systems, present a rapidly growing field of\nresearch, but only few experimental studies of these phenomena have been\nreported so far. Valuable data on the evolution of the low-energy dipole\nresponse in unstable neutron-rich nuclei have been gathered in recent\nexperiments, but the available information is not sufficient to determine the\nnature of observed excitations. Even in stable nuclei various modes of giant\ncollective oscillations had been predicted by theory years before they were\nobserved, and for that reason it is very important to perform detailed\ntheoretical studies of the evolution of collective modes of excitation in\nnuclei far from stability. We therefore discuss the modern theoretical tools\nthat have been developed in recent years for the description of collective\nexcitations in weakly-bound nuclei. The review focuses on the applications of\nthese models to studies of the evolution of low-energy dipole modes from stable\nnuclei to systems near the particle emission threshold, to analyses of various\nisoscalar modes, those for which data are already available, as well as those\nthat could be observed in future experiments, to a description of\ncharge-exchange modes and their evolution in neutron-rich nuclei, and to\nstudies of the role of exotic low-energy modes in astrophysical processes.",
"arxiv_id": "nucl-th/0701081",
"authors": [
"N. Paar",
"D. Vretenar",
"E. Khan",
"G. Colo"
],
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"doi": "10.1088/0034-4885/70/5/R02",
"journal_ref": "Rept.Prog.Phys.70:691-794,2007",
"title": "Exotic modes of excitation in atomic nuclei far from stability",
"url": "https://arxiv.org/abs/nucl-th/0701081"
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