Gamow-Teller Strength in Ca48 and Ni78 with the Charge-Exchange Subtracted Second Random-Phase Approximation

D. Gambacurta, M. Grasso, and J. Engel
Phys. Rev. Lett. 125, 212501 – Published 20 November 2020

Abstract

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.

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  • Received 10 July 2020
  • Revised 29 September 2020
  • Accepted 19 October 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.212501

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

D. Gambacurta1, M. Grasso2, and J. Engel3

  • 1INFN-LNS, Laboratori Nazionali del Sud, 95123 Catania, Italy
  • 2Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
  • 3Department of Physics and Astronomy, CB 3255, University of North Carolina, Chapel Hill, North Carolina 27599-3255, USA

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Issue

Vol. 125, Iss. 21 — 20 November 2020

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