Neutrinoless quadruple beta decay

@article{Heeck2013NeutrinolessQB,
  title={Neutrinoless quadruple beta decay},
  author={Julian Heeck and Werner Rodejohann},
  journal={Europhysics Letters},
  year={2013},
  volume={103}
}
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: . We identify three candidate isotopes for this decay, the most promising one being 150Nd due to its high -value of . Analogous processes, such as neutrinoless quadruple electron… 
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