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Mean-field effects on neutrinoless double beta decay
Institution:1. Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, India;2. Chemical Engineering Department, Indian Institute of Technology, Kharagpur 721302, India;1. University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014, Finland;2. INFN, Sezione di Torino, Via P. Giuria 1, I-10125 Torino, Italy;3. Department of Physics, Indian Institute of Technology, Roorkee 247667, India;1. Department of Chemical Engineering and Polymer Research Center, and Center for Life Sciences and Technologies, Bogazici University, 34342 Istanbul, Turkey;2. Department of Computational and Systems Biology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15260, USA;1. Department of Ethology and Social Biology of Insects, Schmalhausen-Institute of Zoology, B. Chmielnicki Street 15, 01601 Kiev, Ukraine;2. Department of Functional Morphology and Biomechanics, Christian-Albrechts-University of Kiel, Am Botanischen Garten 1-9, D-24098 Kiel, Germany;3. Institute for Evolutionary Ecology, Acad. Lebedev Street 37, 03143 Kiev, Ukraine;4. Department of Entomology, Biological Faculty, Lomonosov Moscow State University, 1-12 Leninskie Gory, 119991 Moscow, Russia;5. Department of Scientific Fundamental Collection, Schmalhausen-Institute of Zoology, B. Chmielnicki Street 15, 01601 Kiev, Ukraine;6. Department of Zoology, Dragomanov Pedagogical University, Pirogov Street 9, 01601 Kiev, Ukraine;7. Department of Zoology, Institute of Biology, National Shevchenko-University, Volodymirska Street, 64, 01601 Kiev, Ukraine
Abstract:Mean-field effects on the nuclear matrix elements involved in the neutrinoless double beta (0νββ) decay of several double-electron and double-positron emitters have been studied within the framework of the relativistic quark-confinement model and the quasiparticle random-phase approximation. The single-particle energies of the model space have been generated both by using the standard Woods-Saxon parametrization of the mean field and adjusting the quasiparticle spectra with the data from neutron- and proton-odd nuclei. The 0νββ rates are found to be much less affected by the energies of the mean-field orbitals than the rates of the two-neutrino double beta decay. The present study suggests that the extracted effective neutrino masses vary within a factor of two when using different realistic single-particle bases in the calculations.
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