High-spin structures in ¹³²\mathrmXe and ¹³³\mathrmXe and evidence for isomers along the ℕ=79 isotones

The 50 � N,Z � 82 region of the Segre chart, spanning the nuclei “northwest” of doubly-magic 132Sn, is an intriguing study ground to test the suitability and predictive power of nuclear models at both low and high spins. Low-spin excited states in the nearly spherical nuclei near proton- and neutronshell closures are well described as anharmonic vibrations [1] with a gradual change to rotational structures further away from the closed shells. Further on, quasiparticleexcitations play a key role and are responsible for the presence of yrast-trap isomers. These long-lived states interrupt and fragment the decay flux in spectroscopic investigations. High- j couplingsinvolving the unique-parity h11/2 neutron-hole orbital give rise to a wealth of high-spin states with multi- quasiparticlecharacter. In particular, detailed knowledge of isomers is crucial to ascertain the active quasiparticleconfigurations in the specific nucleus.