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We study for the first time the internal structure of 140Te through thebeta-delayed gamma-ray spectroscopy of 140Sb. The very neutron-rich 140Sb, Z =51 and N = 89, ions were produced by the in-flight fission of 238U beam on a9Be target at 345 MeV per nucleon at the Radioactive Ion Beam Factory, RIKEN.The half-life and spin-parity of 140Sb are reported as 124(30) ms and (4-),respectively. In addition to the excited states of 140Te produced by thebeta-decay branch, the beta-delayed one-neutron and two-neutron emissionbranches were also established. By identifying the first 2+ and 4+ excitedstates of 140Te, we found that Te isotopes persist their vibrator characterwith E(4+)/E(2+) = 2. We discuss the distinctive features manifest in thisregion, such as valence neutron symmetry and asymmetry, revealed in pairs ofisotopes with the same neutron holes and particles with respect to N = 82.

Nuclear structure of 140Te with N = 88: Structural symmetry and asymmetry in Te isotopes with respect to the double-shell closure Z = 50 and N = 82