Nuclear physics of non-standard 0νβ β-decay
Kotila, J.; Graf, L.; Deppisch, F. F.; Iachello, F. (2019). Nuclear physics of non-standard 0νβ β-decay. In Civitarese, Osvaldo; Stekl, Ivan; Suhonen, Jouni (Eds.) MEDEX'19 : Workshop on Calculation of Double-Beta-Decay Matrix Elements, AIP Conference Proceedings, 2165. American Institute of Physics, 020017. DOI: 10.1063/1.5130978
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The observation neutrinoless double beta (0νβ β) decay remains crucial for understanding lepton number violation. In view of the difficulties to observe the mass mechanism of 0νβ β-decay, investigations of other mechanisms are in order. These non-standard mechanisms can be divided into short-range and long-range mechanisms. Recently, we have started systematic study for all possible short-range and long-range non-standard mechanisms. The aim of this study is twofold: I) to provide explicit formulas for the nuclear matrix elements (NMEs) and phase-space factors (PSFs) from which the decay rate for one or a combination of mechanisms operating at the same time can be calculated; II) to provide numerical values of the NMEs and PSFs obtained by making use of the microscopic interacting boson model (IBM-2) for the NMEs and of exact Dirac wave functions for the PSFs.