Ratio B(E2, 4\rightarrow2)/B(E2, 2\rightarrow 0) in Even-Even   Nuclei:Apparent Anomalous Behavior of the Chromium Isotopes
  We consider the ratio RE4 = B(E2,4\rightarrow2)/B(E2,2\rightarrow 0) for the lowest 2^{+} and 4^{+} states in even-even nuclei. In the rotatonal and vibrational models and the shell model calculations here considered, RE4 is greater than one, however empirically, using adopted values from NNDC for ^{48}Cr and ^{50} Cr this ratio is less than one. 
Daniel Hertz-Kintish, Larry Zamick
nucl-th nucl-ex