Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.212501
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Funding
- European Union [654002]
- IN2P3-CNRS BRIDGE-EDF project
- U.S. Department of Energy (DOE), Office of Science [DE-FG02-97ER41019]
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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 Ca-48, the lightest double-beta emitter that could be used in an experiment, and in Ni-78, 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 Ca-48, as does the beta-decay rate in Ni-78. 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-beta decay in the same framework.
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