Abstract
A correlation between the parameter β 2 and a half-life T 1/2 for oblate nuclei with sign β 2 < 0 and an anticorrelation for elongated nuclei sign β 2 > 0 are found. These analytical expressions for the function β 2 ( T 1/2 ) make it possible to calculate the shape parameters of β 2 nuclei if we know the half-lives T 1/2 for exotic nuclei for which this value is most accurately measured.