INFLUENCE OF COLLECTIVITY ON REDUCED HINDRANCE FACTOR OF K-ISOMERS IN TANTALUM AND HAFNIUM ISOTOPES.

The correlations of the reduced hindrance factor Fν of the K-isomers in Ta and Hf isotopes with respect to NpNn (the product of valence nucleons), EK − ER (the isomer excitation energy referred to a rigid rotor), and EK(Nn)−EK(Nn−max) (the energy difference between the same configuration at Nn and Nn−max (middle of a shell), at given spin and isotopic chain) have been re-examined. The analysis is performed in the valence regionsdivided into particle–particle (p–p), particle–hole (p–h), and hole–hole (h– h) regions, based on the NpNn phenomenology. The Ta and Hf isotopes are considered, given the availability of the same spin configuration in the different sectors of the valence regions. In our study, we observe that the parameter EK(Nn)−EK(Nn−max) shows a significant correlation with Fν, within an isotopic chain. [ABSTRACT FROM AUTHOR]