Incipient reflection asymmetry in ¹²⁷Xe

Excited states in 126,127,128Xe were populated via 122Sn(9Be, xn & gamma; ) fusion-evaporation reaction at a beam energy of 48 MeV. A positive parity rotational-like sequence of AI = 2 & gamma; -transitions, which is found to decay into the negative parity band via E1 transitions, is observed above I & pi; = 19/2+ state at 2307 keV in 127Xe. Such enhanced E1 & gamma; -transitions are also observed between the antimagnetic rotational (AMR) and longitudinal wobbling (LW) bands in this nucleus. These indicate the presence of simplex symmetry with s = & PLUSMN;i excitation in 127Xe. & COPY; 2023 Elsevier B.V. All rights reserved.