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

The transitional nuclei ¹³²Xe and ¹³³Xe are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in ¹³⁶Xe+²⁰⁸Pb MNT reactions employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (ii) in the ¹³⁶Xe+¹⁹⁸Pt MNT reaction employing the GAMMASPHERE spectrometer in combination with the gas-detector array CHICO, and (iii) as an evaporation residue after a ¹³⁰Te(α ,x n )^{134 -x n}Xe fusion-evaporation reaction employing the HORUS γ -ray array at the University of Cologne. The high-spin level schemes are considerably extended above the J^π=(7^-) and (10⁺) isomers in ¹³²Xe and above the 11 /2^- isomer in ¹³³Xe. The results are compared to the high-spin systematics of the Z =54 as well as the N =78 and N =79 chains. Furthermore, evidence is found for a long-lived (T_{1 /2}≫1 μ s ) isomer in ¹³³Xe which closes a gap along the N =79 isotones. Shell-model calculations employing the SN100PN and PQM130 effective interactions reproduce the experimental findings and provide guidance to the interpretation of the observed high-spin features.