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Isomer spectroscopy of heavy neutron-rich nuclei beyond the N=126 closedshell has been performed for the first time at the Radioactive Isotope BeamFactory of the RIKEN Nishina Center. New millisecond isomers have beenidentified at low excitation energies, 985.3(19) keV in 213Tl and 874(5) keV in215Tl. The measured half-lives of 1.34(5) ms in 213Tl and 3.0(3) ms in 215Tlsuggest spins and parities 11/2- with the single proton-hole configurationh11/2 as leading component. They are populated via E1 transitions by the decayof higher-lying isomeric states with proposed spin and parity 17/2+,interpreted as arising from a single s1/2 proton hole coupled to the 8+seniority isomer in the (A+1)Pb cores. The lowering of the 11/2- states isascribed to an increase of the h11/2 proton effective single-particle energy asthe second g9/2 orbital is filled by neutrons, owing to a significant reductionof the proton-neutron monopole interaction between the h11/2 and g9/2 orbitals.The new ms-isomers provide the first experimental observation of shellevolution in the almost unexplored N>126 nuclear region below doubly-magic208Pb.

First Exploration of Monopole-Driven Shell Evolution above the N = 126 shell closure: new Millisecond Isomers in 213Tl and 215Tl