Neutrinoless Quadruple Beta Decay

@article{Heeck2013NeutrinolessQB,
  title={Neutrinoless Quadruple Beta Decay},
  author={Julian Heeck and Werner Rodejohann},
  journal={arXiv: High Energy Physics - Phenomenology},
  year={2013}
}
We point out that lepton number violation is possible even if neutrinos are Dirac particles. We illustrate this by constructing a simple model that allows for lepton number violation by four units only. As a consequence, neutrinoless double beta decay is forbidden, but neutrinoless quadruple beta decay is possible: $(A,Z) \to (A,Z+4) + 4 e^-$. We identify three candidate isotopes for this decay, the most promising one being Nd-150 due to its high $Q_{0\nu 4\beta}$-value of 2 MeV. Analogous… 

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