Double Beta Decay
Double beta (ββ) decay is a rare transition between two nuclei with the same mass number that changes the nuclear charge number by two units. It has been long recognized as a powerful tool for the study of lepton conservation in general and of neutrino properties in particular. Because the lifetimes of ββ decay are so long, the experimental study of ββ decay is particularly challenging and has spawned a whole field of experiments requiring very low background.
© 1994 Annual Reviews. We would like to thank Boris Kayser for explanations concerning Equation 15. This work was supported by the US Department of Energy under contracts DE-FG03-91ER40679 and DE-FG03-88ER40397.