Gamow-Teller Strength in $^{48}$Ca and $^{78}$Ni with the Charge-Exchange Subtracted Second Random-Phase Approximation - IN2P3 - Institut national de physique nucléaire et de physique des particules Accéder directement au contenu
Article Dans Une Revue Phys.Rev.Lett. Année : 2020

Gamow-Teller Strength in $^{48}$Ca and $^{78}$Ni with the Charge-Exchange Subtracted Second Random-Phase Approximation

D. Gambacurta
  • Fonction : Auteur
Julien Engel

Résumé

We develop a fully self-consistent subtracted second random-phase approximation for charge-exchange processes with Skyrme energy-density functionals. As a first application, we study Gamow-Teller excitations in the doubly magic nucleus Ca48, the lightest double-β emitter that could be used in an experiment, and in Ni78, the single-beta-decay rate of which is known. The amount of Gamow-Teller strength below 20 or 30 MeV is considerably smaller than in other energy-density-functional calculations and agrees better with experiment in Ca48, as does the beta-decay rate in Ni78. These important results, obtained without ad hoc quenching factors, are due to the presence of two-particle–two-hole configurations. Their density progressively increases with excitation energy, leading to a long high-energy tail in the spectrum, a fact that may have implications for the computation of nuclear matrix elements for neutrinoless double-β decay in the same framework.

Dates et versions

hal-02908370 , version 1 (28-07-2020)

Identifiants

Citer

D. Gambacurta, M. Grasso, Julien Engel. Gamow-Teller Strength in $^{48}$Ca and $^{78}$Ni with the Charge-Exchange Subtracted Second Random-Phase Approximation. Phys.Rev.Lett., 2020, 125 (21), pp.212501. ⟨10.1103/PhysRevLett.125.212501⟩. ⟨hal-02908370⟩
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