Recent data on electric quadrupole transition probabilities or B(E2; 0⁺ → 2⁺) values.
New Evaluation: Tables of E2 transition probabilities from the first 2⁺ states in even-even nuclei, B. Pritychenko, M. Birch, B. Singh, M. Horoi, At. Data Nucl. Data Tables 107, 1 (2016).

Explanation of Tables:

Nuclide	The even Z, even N nuclide studied
Transition Energy	Energy of the first excited 2+ state in keV
Transition Rate Ratio	B(↑) = (2J + 1)B(↓)/(2J0+1), where J0 and J are spins of the lower and upper levels, respectively.
B(E2; 0+ → 2+)	Reduced electric quadrupole transition rate for the ground state to 2+ state transition in units of e2b2
W.U.	Weisskopf units are based on single-particle estimate for the λ-th multipole reduced electric transition probability and originally have been used for transitions from higher to lower states: Bw(Eλ)=(1/4π)(3/(λ+3))2(1.2)2λA2λ/3 e2fm2λ
	Weisskopf (single-particle) B(E2) value for 0+→2+ transition is given by: Bw(E2↑)=0.297xA4/3 e2fm4
τ	Mean lifetime of the state in ps τ = 40.81 x 1013E-5[B(E2↑)/e2b2]-1(1 + α)-1
β	Deformation parameter β = (4π/3ZR02)[B(E2↑)/e2]1/2, where R02 = (1.2 x 10-13 A1/3 cm)2 = 0.0144A2/3b
Q0	Intrinsic quadrupole moment in b Q0 = [16πB(E2↑)/5e2]1/2
Reference	Nuclear Science References Database Abstract
Global Best Fit	Global Best Fit for B(E2)↑ by S. Raman, C.W. Nestor and P. Tikkanen
Modified Grodzins rule	B(E2↑) = (2.57±0.45)E-1Z2A-2/3 β = (466±41)E-1/2A-1
null	No data available