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Individual Low-Energy Toroidal Dipole State in ^{24}Mg.

V O Nesterenko1, A Repko2, J Kvasil3

  • 1Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow region 141980, Russia.

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|May 19, 2018
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Researchers discovered a unique vortical toroidal state (TS) in magnesium-24 nuclei. This low-energy excitation offers a distinct experimental signature for studying nuclear flow in deformed nuclei.

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Area of Science:

  • Nuclear Physics
  • Quantum Mechanics
  • Atomic Physics

Background:

  • Low-energy dipole excitations in atomic nuclei are crucial for understanding nuclear structure.
  • Toroidal states (TS) represent a unique excitation mode with potential experimental signatures.
  • Skyrme quasiparticle random phase approximation (QRPA) is a theoretical framework for nuclear structure calculations.

Purpose of the Study:

  • To investigate low-energy dipole excitations in ^{24}Mg.
  • To identify and characterize vortical toroidal states (TS) in deformed nuclei.
  • To explore the relationship between TS and nuclear cluster structure.

Main Methods:

  • Utilizing the Skyrme quasiparticle random phase approximation (QRPA) for axial nuclei.
  • Employing the SLy6 Skyrme force parametrization for calculations.
  • Analyzing spectroscopic properties and comparing results across different Skyrme parametrizations (SLy6, SVbas, SkM*).

Main Results:

  • Identified the lowest I^{π}K=1^{-}1 excitation in ^{24}Mg as a vortical toroidal state (TS) at 7.92 MeV.
  • The TS is a vortex-antivortex realization of Hill's vortex within a deformed axial confinement.
  • The TS's low energy is attributed to the significant prolate axial deformation in ^{24}Mg.
  • This individual TS is experimentally more accessible than toroidal dipole resonances.

Conclusions:

  • The study confirms the existence of an individual vortical toroidal state (TS) in ^{24}Mg.
  • This TS provides a unique experimental probe for nuclear flow in highly prolate light nuclei.
  • Similar toroidal states may exist in other deformed light nuclei, offering new avenues for nuclear reaction studies.