4.5 Article

Coupling of pairing and triaxial shape vibrations in collective states of γ-soft nuclei

Journal

PHYSICAL REVIEW C
Volume 103, Issue 5, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.103.054322

Keywords

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Funding

  1. Tenure Track Pilot Programme of the Croatian Science Foundation
  2. Ecole Polytechnique Federale de Lausanne
  3. Project Exotic Nuclear Structure and Dynamics [TTP-2018-07-3554]
  4. Croatian-Swiss Research Programme
  5. QuantiXLie Centre of Excellence
  6. Croatian Government
  7. European Union through the European Regional Development Fund - the Competitiveness and Cohesion Operational Programme [KK.01.1.1.01]
  8. NSFC [11875225, 12005109, 11765015]

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This study addresses the long-standing problem of the simultaneous description of shape oscillations and pairing vibrations in deformed nuclei, using self-consistent mean-field calculations and the framework of the interacting boson approximation. Explicit coupling to pairing vibrations is taken into account, showing the importance of dynamical pairing degrees of freedom in low-energy excited states of gamma-soft and triaxial nuclei, as illustrated for Xe-128 and Xe-130.
In addition to shape oscillations, low-energy excitation spectra of deformed nuclei are also influenced by pairing vibrations. The simultaneous description of these collective modes and their coupling has been a long-standing problem in nuclear structure theory. Here we address the problem in terms of self-consistent mean-field calculations of collective deformation-energy surfaces, and the framework of the interacting boson approximation. In addition to quadrupole shape vibrations and rotations, the explicit coupling to pairing vibrations is taken into account by a boson-number nonconserving Hamiltonian, specified by a choice of a universal density functional and pairing interaction. An illustrative calculation for Xe-128 and Xe-130 shows the importance of dynamical pairing degrees of freedom, especially for structures built on low-energy 0(+) excited states, in gamma-soft and triaxial nuclei.

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