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Band Structures Extending to Very High Spin in $^{126}$Xe

Abstract : High 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.
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Contributor : Michel Lion <>
Submitted on : Friday, April 13, 2007 - 2:28:08 PM
Last modification on : Wednesday, September 16, 2020 - 4:17:31 PM
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C. Rønn Hansen, G. Sletten, G.B. Hagemann, B. Herskind, D.R. Jensen, et al.. Band Structures Extending to Very High Spin in $^{126}$Xe. Physical Review C, American Physical Society, 2007, 76, pp.034311. ⟨10.1103/PhysRevC.76.034311⟩. ⟨in2p3-00141618⟩



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