Abstract
The electric reduced transition probabilities B(E2)down arrow of even-neutron-rich Te120-126 nuclei by means of interacting boson model-1 (IBM-1) are calculated. The R-4/2 values of the first 4(+) and 2(+) levels are also calculated and the U(5) symmetry for these nuclei is indicated. The transition rate R = B(E2: L+-> (L-2)(+))/ B(E2: 2(+) -> 0(+)) of a few lowlying quadrupole collective states is studied systematically and compared with the experimental data. The electric reduced transition probabilities of even Te120-126 nuclei of gamma transition states of 8(+)-> 6(+), 6(+)-> 4(+), 4(+) -> 2(+) and 2(+)-> 0(+) are studied and compared with the experimental values. In addition, the systematic B(E2) values, intrinsic quadrupole moments and deformation parameters of even neutrons of N= 68-74 in Te isotopes are also studied. All the computed values from the present study are in good agreement with the experimental data. The IBM-1 formula for the reduced transition probabilities B(E2) is analytically deduced in U(5) limit for a few ground-state transitions in even Te120-126 isotopes.