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- W2981036256 abstract "A new model, based on the BCS approach, is specially designed to describe nuclear phenomena $(A,Z)rightarrow (A,Zpm 2)$ of double-charge exchange (DCE). After being proposed, and applied in the particle-hole limit, by one of the authors (F. Krmpoti'c [1]), so far it was never been applied within the BCS mean-field framework, nor has its ability to describe DCE processes been thoroughly explored. It is a natural extension of the pn-QRPA model, developed by Halbleib and Sorensen [2] to describe the single $beta$-decays $(A,Z)rightarrow (A,Zpm 1)$, to the DCE processes. As such, it exhibits several advantages over the pn-QRPA model when is used in the evaluation of the double beta decay (DBD) rates. For instance, i) the extreme sensitivity of the nuclear matrix elements (NMEs) on the model parametrization does not occur, ii) it allows to study NMEs, not only for the fundamental state in daughter nuclei, as the pn-QRPA model does, but also for all final $0^+$ and $2^+$ states, accounting at the same time their excitation energies and the corresponding DBD Q-values, iii) together with the DBD-NMEs it provides also the energy spectra of Fermi and Gamow-Teller DCE transition strengths, as well as the locations of the corresponding resonances and their sum rules, iv) the latter are relevant for both the DBD and the DCE reactions, since the involved nuclear structure is the same; this correlation does not exist within the pn-QRPA model. As an example, detailed numerical calculations are presented for the $(A,Z)rightarrow (A,Z+ 2)$ process in $^{48}$Ca $rightarrow ^{48}$Ti and the $(A,Z)rightarrow (A,Z- 2)$ process in $^{96}$Ru $rightarrow ^{96}$Mo, involving all final $0^+$ states and $2^+$ states." @default.
- W2981036256 created "2019-10-25" @default.
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- W2981036256 date "2020-04-21" @default.
- W2981036256 modified "2023-10-09" @default.
- W2981036256 title "Nuclear structure model for double-charge-exchange processes" @default.
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- W2981036256 doi "https://doi.org/10.1103/physrevc.101.044314" @default.
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