Neutron separation energies at N=83 and the isomer position in I136

New experimental total beta-decay energies of Te-135,Te-136 and of the two isomers of I-136 have been obtained, giving much improved accuracy for the nuclear masses of these nuclides. The neutron separation energies at N=83 were deduced and are compared to recent theoretical and systematic predictions. The new results resolve the problem with the excitation energy of the isomeric state of I-136. Theoretical calculations of the isomer splitting of I-136 are in good agreement with the new data.