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To be published in Physical Review CHigh spin states in $^{126}$Xe have been populated in the $^{82}$Se($^{48}$Ca,4n)$^{126}$Xe reaction in two experiments, one at the VIVITRON accelerator in Strasbourg using the Euroball detector array, and a subsequent one with ATLAS at Argonne using the Gammasphere Ge-detector array. Levels and assignments made previously for $^{126}$Xe up to I = 20 have been confirmed and extended. Four regular bands extending to a spin of almost I = 60, which are interpreted as two pairs of signature partners with opposite parity, are identified for the first time. The α = 0 partner of each pair is connected to the lower-lying levels, while the two α = 1 partners remain floating. A peak-shape analysis of transitions in the strongest populated (π, α) = (-,0) band provides a value of $5.2 ^0.4 _0.5$ b for the transition quadrupole moment, which can be related to a minimum in the potential-energy surface calculated by the Ultimate Cranker cranked shell model code at ε ≈ 0.35 and γ ≈ 5 0. The four lowest bands calculated for this minimum compare well with the two signature pairs experimentally observed over a wide spin range. A sharp upbend at $\hbar$ω ∼1170 keV is interpreted as a crossing with a band involving the $j_15/2$ neutron orbital, for which pairing correlations are expected to be totally quenched. The four long bands extend to within ∼5 spin units of a crossing with an yrast line defined by calculated hyperdeformed transitions and will serve as important stepping stones into the spin region beyond 60 $\hbar$ for future experiments

physical review c

Band structures extending to very high spin in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Xe</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>126</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Band structures extending to very high spin inXe126