Overconstrained estimates of neutrinoless double beta decay within the QRPA

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dc.creatorFaessler, Amand
dc.creatorFogli, Gianluigi
dc.creatorLisi, Eligio
dc.creatorRodin, Vadim
dc.creatorRotunno, Anna Maria
dc.creatorSimkovic, Fedor
dc.date2007-11-26
dc.date2008-05-29
dc.date.accessioned2026-07-07T11:38:54Z
dc.date.available2026-07-07T11:38:54Z
dc.descriptionEstimates of nuclear matrix elements for neutrinoless double beta decay (0nu2beta) based on the quasiparticle random phase approximations (QRPA) are affected by theoretical uncertainties, which can be substantially reduced by fixing the unknown strength parameter g_pp of the residual particle-particle interaction through one experimental constraint - most notably through the two-neutrino double beta decay (2nu2beta) lifetime. However, it has been noted that the g_pp adjustment via 2\nu2βdata may bring QRPA models in disagreement with independent data on electron capture (EC) and single beta decay (beta^-) lifetimes. Actually, in two nuclei of interest for 0nu2beta decay (Mo-100 and Cd-116), for which all such data are available, we show that the disagreement vanishes, provided that the axial vector coupling g_A is treated as a free parameter, with allowance for g_A<1 (``strong quenching''). Three independent lifetime data (2nu2beta, EC, β^-) are then accurately reproduced by means of two free parameters (g_pp, g_A), resulting in an overconstrained parameter space. In addition, the sign of the 2nu2beta matrix element M^2nu is unambiguously selected (M^2nu>0) by the combination of all data. We discuss quantitatively, in each of the two nuclei, these phenomenological constraints and their consequences for QRPA estimates of the 0nu2beta matrix elements and of their uncertainties.
dc.descriptionRevised version (27 pages, including 10 figures), focussed on Mo-100 and Cd-116. To appear in J. Phys. G: Nucl. Phys. (2008)
dc.identifierhttps://arxiv.org/abs/0711.3996
dc.identifierhttp://arxiv.org/abs/0711.3996
dc.identifierJ.Phys.G35:075104,2008
dc.identifierdoi:10.1088/0954-3899/35/7/075104
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199731
dc.subjectNuclear Theory
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Experiment
dc.titleOverconstrained estimates of neutrinoless double beta decay within the QRPA
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