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Low-lying dipole and quadrupole states

Are they new excitation modes?

  • Regular Article - Theoretical Physics
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Abstract.

We briefly review the main properties of the low-lying dipole states known as Pygmy Dipole Resonance trying to select the main one which could define this new excitation mode. A good candidate seems to be the isoscalar-isovector mixing. This mixing, more effective at the nuclear surface, has been proved by both theoretical and experimental investigations. On the other hand, the study of the low-lying quadrupole states does not seem to provide clear evidence for a new excitation mode. The theoretical approaches used to investigate the quadrupole response reach different conclusions and the experimental data can only clearly establish the multipolarities of the states and their one-phonon character. Moreover, cross section calculations are not sensitive enough to disentangle between quadrupole states which are considered, in one of the theoretical approach, as due to different excitation mode.

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Author information

Authors and Affiliations

  1. INFN Sezione di Catania, Catania, Italy

    E. G. Lanza & F. Catara

  2. Dipartimento di Fisica e Astronomia “Ettore Majorana”, Università di Catania, Catania, Italy

    E. G. Lanza & F. Catara

  3. School of Physics, University of the Witwatersrand, Johannesburg, South Africa

    L. Pellegri

  4. iThemba LABS, P.O. Box 722, 7129, Somerset West, South Africa

    L. Pellegri

  5. Departamento de FAMN, Facultad de Física, Sevilla, Spain

    M. V. Andrés

  6. Dipartimento di Fisica e Astronomia “Galileo Galilei”, Università di Padova, Padova, Italy

    A. Vitturi

  7. INFN Sezione di Padova, Padova, Italy

    A. Vitturi

Authors
  1. E. G. Lanza
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  2. L. Pellegri
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  3. M. V. Andrés
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  4. F. Catara
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  5. A. Vitturi
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Corresponding author

Correspondence to E. G. Lanza.

Additional information

Communicated by N. Alamanos

Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All data generated during this study are contained in this published article.]

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Lanza, E.G., Pellegri, L., Andrés, M.V. et al. Low-lying dipole and quadrupole states. Eur. Phys. J. A 55, 235 (2019). https://doi.org/10.1140/epja/i2019-12797-y

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  • DOI: https://doi.org/10.1140/epja/i2019-12797-y

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