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- W1567470667 abstract "We calculate the nuclear matrix elements (NMEs) for neutrinoless double-beta decays of $pf$-shell nuclei using the shell model (SM) and energy density functional (EDF) methods. The systematic study of the decays of $mathrm{Ca}ensuremath{rightarrow}mathrm{Ti}$, $mathrm{Ti}ensuremath{rightarrow}mathrm{Cr}$ and $mathrm{Cr}ensuremath{rightarrow}mathrm{Fe}$ isotopes allows for a detailed comparison between the two nuclear structure many-body approaches. We observe that while the dominant Gamow-Teller part of the NME differs roughly by a factor of 2 between SM and EDF, when we restrict the calculations to spherical EDF states and seniority-zero SM configurations, the NMEs obtained by both methods are strikingly similar. This points out the important role of nuclear structure correlations for neutrinoless double-beta decay NMEs. We identify correlations associated with high-seniority components in the initial and final states of the decay as one of the reasons for the discrepancies between SM and EDF results. We also explore exact projection to good isospin, and conclude that it strongly reduces the Fermi contribution of the NMEs, but it has only a moderate effect in the Gamow-Teller part. This work opens up the door for NME benchmarks between different theoretical approaches, and constitutes a step forward towards more reliable estimations of the NMEs." @default.
- W1567470667 created "2016-06-24" @default.
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- W1567470667 date "2014-08-15" @default.
- W1567470667 modified "2023-10-18" @default.
- W1567470667 title "Correlations and neutrinoless<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>β</mml:mi><mml:mi>β</mml:mi></mml:mrow></mml:math>decay nuclear matrix elements of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>p</mml:mi><mml:mi>f</mml:mi></mml:mrow></mml:math>-shell nuclei" @default.
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- W1567470667 doi "https://doi.org/10.1103/physrevc.90.024311" @default.
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