Neutrinoless decay mediated by the exchange of light and heavy neutrinos: The role of nuclear structure correlations
arXiv:1804.02105 · doi:10.1088/1361-6471/aa9bd4
Abstract
Neutrinoless decay nuclear matrix elements calculated with the shell model and energy-density functional theory typically disagree by more than a factor of two in the standard scenario of light-neutrino exchange. In contrast, for a decay mediated by sterile heavy neutrinos the deviations are reduced to about 50\%, an uncertainty similar to the one due to short-range effects. We compare matrix elements in the light- and heavy-neutrino-exchange channels, exploring the radial, momentum transfer and angular momentum-parity matrix element distributions, and considering transitions that involve correlated and uncorrelated nuclear states. We argue that the shorter-range heavy-neutrino exchange is less sensitive to collective nuclear correlations, and that discrepancies in matrix elements are mostly due to the treatment of long-range correlations in many-body calculations. Our analysis supports previous studies suggesting that isoscalar pairing correlations, which affect mostly the longer-range part of the neutrinoless decay operator, are partially responsible for the differences between nuclear matrix elements in the standard light-neutrino-exchange mechanism.
arXiv comment20 pages, 8 figures, published version
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