科研之友
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摘要
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) -> (A, Z + 4) + 4e(-). 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 2MeV. Analogous processes, such as neutrinoless quadruple electron capture, are also possible. The expected lifetimes are extremely long, and experimental searches are challenging.
- 出版日期2013-8
