Spin-dependent empirical formula for the lowest excitation energies of   the natural parity states in even-even nuclei
  We present an empirical expression which holds for the lowest excitation energy of the natural parity states in even-even nuclei throughout the entire periodic table. This formula contains spin-dependent factors so that it is applied to different multipole states with the same model parameters in contrast to the recently proposed empirical expression where the model parameters had to be fitted for each multipole separately. 
Guanghao Jin, Dongwoo Cha and Jin-Hee Yoon