Study ofE 2 transitions from the 2+ state of the gamma-vibrational band

Abstract

B(E 2) values for the transitions from the 2+ state of the gamma-vibrational band to the 2+ and 0+ states of the ground-state rotational band and from the 2+ state to the 0+ state of the ground-state rotational band in the rare-earth and actinide regions of the even-even nuclei have been calculated by employing up-to-date lifetime data. The known experimentalB(E 2;2′+→ 2+)/B(E 2;2′+ → 0+),B(E 2;2′+→2+)/B(E 2;2+→0+),B(E 2; 2′+→ 0+)/B(E 2; 2+→ 0+),B(E 2; 2′+→ 0+) andB(E 2; 2′+→ 0+) values are compared with the corresponding theoretical estimates of asymmetric-rotor models. It has been observed that Davydov-Filippov model predictions are closer to the respective known experimental rates except those of1900s,1920s, Pt, Sm, Gd and Yb isotopes. An explanation for this disagreement is discussed. DF results for 2+→0+ transitions contradict Zawischa’s predictions for W, Hf, Er, Dy and Sm isotopes and confirm that low-lyingK π ≡ 2+ resonances are classical gamma-vibrations.