Nuclear structure of122Xe studied via high-statisticsβ+/EC-decay

B Jigmeddorj,M Moukaddam,G Hackman,U Rizman,P Voss,T Bruhn,C Andreoiu,John L Wood ,P E Garrett ,C E Svensson ,A B Garnsworthy ,Z.M Wang,J Park,M M Rajabali ,G C Ball ,D S Cross ,B Hadinia,A J Radich ,E T Rand ,J L Pore ,S W Yates

doi:10.1051/epjconf/201610703014

Abstract

The nuclear structure of 122 Xe has been investigated with measurements of the β + /EC decay of 122 Cs with the 8 π γ -ray spectrometer at the TRIUMF-ISAC facility. The data collected have enabled the determination of relative B(E2) values of some low-energy transitions, and the in-band transitions of the excited 0+ bands have been observed. As a result, the 2+ rotational band members for the 0+ 2 and 0+ 3 states have been firmly identified.

Highlights

Nuclei in the Z > 50, N < 82 region exhibit a very smooth evolution of collectivity; collectivity in this region is poorly characterized because of a general lack of high-quality spectroscopic data for low-spin states
The strongly populated 0+ states, which are candidates for the main fragments of the proton pairing vibration, appear to have a similar deformation as the ground state band based on the similarity of the spacing of their possible rotational band members
In order to provide detailed spectroscopic data, especially of weak lowenergy decay branches and possible key E2 transitions, a high-statistics 122 Cs β+ /EC-decay experiment was performed at the TRIUMF-ISAC facility

Summary

Introduction

Nuclei in the Z > 50, N < 82 region exhibit a very smooth evolution of collectivity; collectivity in this region is poorly characterized because of a general lack of high-quality spectroscopic data for low-spin states. The excited 0+3 states in 124−132 Xe isotopes [1] are very strongly populated in (3 He, n) reactions, suggesting that there are important proton subshell gaps influencing the low-lying structure of these isotopes.

Results

Conclusion