New low-spin states of ¹²²Xe observed via high-statistics β-decay of ¹²²Cs

¹ University of Guelph, Guelph, ON, Canada
² Simon Fraser University, Burnaby, BC, Canada
³ TRIUMF, Vancouver, BC, Canada
⁴ University of British Columbia, Vancouver, BC, Canada
⁵ Georgia Institute of Technology, Atlanta, GA, USA
⁶ University of Kentucky, Lexington, KY, USA

^a e-mail: bjigmedd@uoguelph.ca
^b Present Address: McMaster University, Hamilton, ON, Canada
^c Present Address: University of Surrey, Guildford, UK
^d Present Address: Lund University, Lund, Sweden
^e Present Address: Lawrence Berkeley National Laboratory, USA
^f Present Address: Tennessee Technological University, TN, USA
^g Present Address: Chalk River Laboratories, ON, Canada
^h Present Address: Albion College, Michigan, USA

Published online: 16 May 2018

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.