الخلاصة

In this paper , 170-176 Yb isotopes have been studied by using interacting boson model (IBM-1) to determine energy levels and it was classified in two bands the ground state and bata band addition, the square of rotational energy and the moment of inertia values for 170-176 Yb were calculated and compared with the experimental data. The obtained results for 170-176 Yb were reasonably in good agreement with the experimental data .The attestations refer to this isotopes belong to the rotational limit SU(3)