Summary
Preliminary results are reported of an experimental search on doublenegatron decay, electron capture plus positron emission and double-electron capture to ground and excited levels of various nuclei. No evidence has been found for any type of neutrinoless process, and upper limits ranging from 10−2 to 10−4 have been obtained on the fraction of right-handed currents.
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Bellotti, E., Fiorini, E., Liguori, C. et al. An experimental investigation on lepton number conservation in double-beta processes. Lett. Nuovo Cimento 33, 273–283 (1982). https://doi.org/10.1007/BF02725993
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DOI: https://doi.org/10.1007/BF02725993