Abstract
Adopted values for the reduced electromagnetic transition probability, B(E2)ex, from the ground to the first-excited 2+-state of even-even nuclei are given in Table I. Values of β2, the quadrupole deformation parameter, and of T, the mean life of the 2+ state, are also listed there. Table II presents the data on which Table I is based, namely the experimental results for B(E2)ex values with quoted errors. The literature has been covered to January 1965. The ratio of the value of β2 to values expected from the single-particle model is presented graphically as a function of neutron number. As an indication of the extent of collective features in nuclear structure, this ratio seems a better measure than the value of β2 itself.
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