In-beam γ-ray coincidence spectroscopy for low-lying states of tellurium isotopes by using a natSn(α,2nγ) reaction

Low-lying states of 118,120,122Te isotopes were studied through the natSn(α,2nγ) fusion-evaporation reaction. The experiment was performed at a new beam line recently attached to the MC-50 cyclotron of the Korea Cancer Center Hospital. The 22-MeV α-beam was transported to the beam line and bombarded on a natural tin target. This was the first fusion-evaporation reaction ever made in Korea with such a beam energy as to overcome the Coulomb barrier for this medium-mass nucleus. To understand the interplay between the collective and the single-particle structures in transitional tellurium nuclei, we focused on examining the low-lying states that were populated and had an angular momentum of up to 8ℎ. Results obtained by interaction boson approximation and total routhian surface calculations are also presented