A new expression for nuclear rotational spectra

A new formula, which is derived from a deformed rotor model for describing nuclear rotational spectra, is analyzed. The ground band of most even-even rare-earth and actinide nuclei are accurately reproduced using a damped non linear least-square fitting procedure for determining parameters of the the ory. The results show that energy spectra obtained from a deformed rotor mo del are more accurate than those from a three-parameter formula based on pe rturbation theory.