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 , the lightest double- emitter that could be used in an experiment, and in , 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 , as does the beta-decay rate in . 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- decay in the same framework.
- Received 10 July 2020
- Revised 29 September 2020
- Accepted 19 October 2020
DOI:https://doi.org/10.1103/PhysRevLett.125.212501
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