A multinucleon transfer reaction between a thin self-supporting 78 198 Pt target and an 850 MeV 54 136 Xe beam has been used to populate and study the structure of the N = 80 isotone 56 136 Ba. Making use of time-correlated ␥-ray spectroscopy, evidence for an I = ͑10 + ͒ isomeric state has been found with a measured half-life of 91± 2 ns. Prompt-delayed correlations have also enabled the tentative measurement of the near-yrast states which lie above the isomer. Shell-model calculations suggest that the isomer has a structure which can be assigned predominantly as ͑h 11/2 ͒ 10 + −2 . The results are discussed in terms of standard and pair-truncated shell-model calculations, and compared to the even-Z N= 80 isotones ranging from 50 130 Sn to 68 148 Er. A qualitative explanation of the observed dramatic decrease in the B͑E2:10 + → 8 + ͒ value for the N = 80 isotones at 136 Ba is given in terms of the increasing single-hole energy of the h 11/2 neutron configuration as the proton subshell is filled. The angular momentum transfer to the binary fragments in the reaction has also been investigated in terms of the average total ␥-ray fold versus the scattering angle of the recoils.
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