Double beta (ββ) decay is a rare transition between two nuclei with same mass number that changes the nuclear charge number by two . It has been long recognized as a powerful tool for the study of conservation in general and of neutrino properties in particular. the lifetimes of ββ decay are so long, the experimental study ββ decay is particularly challenging and has spawned a whole field experiments requiring very low background.
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Moe et al. (1994) studied this question.
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