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Favored neutrinoless double beta decay mechanisms and associated nuclear matrix elements

Fedor Simkovic (Comenius University and JINR Dubna Bratislava, Slovakia)

The recent progress in theoretical description of the 0νββ-decay is shortly reviewed. The 0νββ-decay with the inclusion of the right-handed leptonic and hadronic currents and by assuming exchange of both light and heavy neutrinos is revisited. The possibility to discriminate between different 0νββ-decay mechanisms by using data on 0νββ-decay half-lives of different nuclei is addressed. Subject of interest are the accuracy and reliability of calculated NMEs associated with different 0νββ-decay mechanisms. 

The present-day results of the calculation of the 0νββ-decay NMEs are discussed. A possible progress in the calculation of the double beta decay NMES within the QRPA approached is outlined and supported by the studies performed within schematic models. An impact of the quenching of the axial-vector coupling constant on double-beta decay processes is investigated and possibility to determined quenched value of gA is proposed. A connection between the 2νββ-decay and 0νββ-decay matrix elements is analyzed. The importance of charge-exchange reactions, double-charge exchange reactions and charge exchange of pion on nuclei for determining 0νββ-decay NMEs is discussed.

"CNNP 2017 - Conference on Neutrino and Nuclear Physics" (Catania, 15-21 October 2017)

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