Two-proton high-K oblate structures in ¹⁹⁴Pb

Two regular dipole gamma -ray cascades have been observed in ¹⁹⁴Pb. A comprehensive level scheme related to these structures has been built and first members of rotational bands built on K=8 and K=11 two-proton oblate states have been identified. From the excitation energies, spin values, behaviours of the moments of inertia and alignments, and from the comparison with the isotone ¹⁹²Hg, multiparticle configurations can be attributed to three high-spin structures of ¹⁹⁴Pb built respectively on the 4966 keV, 4334 keV and 6198 keV levels: ( pi 9/2(505) pi 13/2(606))(vi13/2)², ( pi 9/2(505) pi 13/2(606))(vf5/2vi13/2), ( pi 9/2(505) pi 13/2(606)) (vf5/2(vi13/2)³). Within this interpretation, the regular dipole bands correspond to the presence of two or three i13/2 decoupled neutrons.