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Article Dans Une Revue Phys.Rev.C Année : 2020

Limits on assigning a shape to a nucleus

Alfredo Poves
  • Fonction : Auteur
Yoram Alhassid
  • Fonction : Auteur

Résumé

The interpretation of nuclear observables in the laboratory frame in terms of the intrinsic deformation parameters β and γ is a classical theme in nuclear structure. Here we use the quadrupole invariants, calculated within the framework of the configuration-interaction shell model, to clarify the meaning and limitations of nuclear shapes. We introduce a novel method that enables us to calculate accurately higher-order invariants and, therefore, the fluctuations in both β and γ. We find that the shape parameter β often has a non-negligible degree of softness and that the angle γ is usually characterized by large fluctuations, rendering its effective value not meaningful. Contrary to common belief, we conclude that doubly magic nuclei are not spherical, because the notion of a well-defined shape does not apply to them.

Dates et versions

hal-02165518 , version 1 (26-06-2019)

Identifiants

Citer

Alfredo Poves, Frederic Nowacki, Yoram Alhassid. Limits on assigning a shape to a nucleus. Phys.Rev.C, 2020, 101 (5), pp.054307. ⟨10.1103/PhysRevC.101.054307⟩. ⟨hal-02165518⟩
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