intercomparison of different experimental techniques to obtain these data are outlined.

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A collaborative study by Brookhaven-McMaster-Central Michigan is underway to evaluate B(E2)↑ for 0 + 1 → 2 + 1 transitions. This work is a continuation of a previous USNDP evaluation and has been motivated by a large number of recent measurements and nuclear theory developments. It includes an extended compilation, data evaluation procedures and shell model calculations. The subset of B(E2)↑ recommended values for nuclei of relevance to the double-beta decay problem is presented, and evaluation policies of experimental data and systematics are discussed. Future plans for completion of the B(E2;0 + 1 → 2 + 1 ) evaluation project are also described.

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Using Grodzins formalism as modified by S. Raman et al., Phys. Rev. C 37 (1988) 805, and D. Habs et al., CERN Proposal INTC-P-156 (2002), we analyze systematics of our latest evaluated B(E2) data for all the eveneven nuclei in Z=2-104 range published in At. Data Nucl. Data Tables 107 (2016) 1. The analysis indicates a low predictive power of systematics for a large number of cases, and a strong correlation between B(E2) fit values and nuclear structure effects. These findings provide a strong rationale for introduction of individual or elemental (grouped by Z) fit parameters. The current estimates of quadrupole collectivities for systematics of even-even nuclei yield complementary values for comparison with experimental results and theoretical calculations. The lists of fit parameters and predicted B(E2) values are given and possible implications are discussed.

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