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English

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Released

Journal Article

##### MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons37613

Heeck,  Julian
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30951

Rodejohann,  Werner
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

##### Fulltext (public)

1306.0580.pdf
(Preprint), 166KB

##### Supplementary Material (public)
There is no public supplementary material available
##### Citation

Heeck, J., & Rodejohann, W. (2013). Neutrinoless Quadruple Beta Decay. Europhysics letters, 103(3): 32001, pp. 1-6. doi:10.1209/0295-5075/103/32001.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-18F4-C
##### Abstract
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 processes, such as neutrinoless quadruple electron capture, are also possible. The expected lifetimes are extremely long, and experimental searches are challenging.