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Comparison with predictions for $\beta\beta 2\nu$ decay.

Quite firm predictions based on QRPA for $\beta\beta 2\nu$ half lives in various nuclei have been obtained by a group at Caltech. The agreement between measured and calculated half-lives in 76Ge, 82Se, 100Mo, in which $\beta\beta 2\nu$ has been observed directly, is quite good, within a factor 2 or 3. The agreement is also reasonable in 128Te and 130Te, for which geochemical data are available. The Strasbourg-Madrid group has performed realistic shell model calculations for 76Ge and 82Se. They too are in reasonable agreement with measured values. Shell model predictions for 48Ca, a nucleus which is particularly simple to describe, also reproduce well the measured value.

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