Abstract
Excited states of 122Xe were studied via the β+/EC decay of 122Cs with the 8π γ-ray spectrometer at the TRIUMF-ISAC facility. Compton-suppressed HPGe detectors were used for measurements of γ-ray intensities, γγ coincidences, and γ-γ angular correlations. Two sets of data were collected to optimize the decays of the ground (21.2 s) and isomeric (3.7 min) states of 122Cs. The data collected have enabled the observation of about 505 new transitions and about 250 new levels, including 51 new low-spin states. Spin assignments have been made for 58 low-spin states based on the deduced β-decay feeding and γ-γ angular correlation analyses.
Highlights
It is known that nuclei in the Z > 50, N < 82 region exhibit a very smooth evolution of collectivity
Recent work on 124Xe [2] has refined the B(E2) values and established that nearly identical quadrupole collectivity exists for the 0+3 band and the ground state band, and suggested that the 0+3 band may represent a significant fragment of the proton pairing vibration
The high-statistics 122Cs β+/EC decay experiment was performed at the TRIUMF-ISAC facility located in Vancouver, BC, Canada
Summary
It is known that nuclei in the Z > 50, N < 82 region exhibit a very smooth evolution of collectivity. Proton sub-shell gaps were suggested in 124−132Xe isotopes [1] based on very strong population of excited 0+3 states in (3He,n) reactions. The spin of the 0+3 state in 122Xe was suggested based on energy systematics in Ref.
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