Sub-Barrier Coulomb excitation of 106Cd with the JANUS setup at ReA3

Describing the evolution of the B(E2;0⁺→2⁺) transition strength in Sn isotopes from A=130 to 104 is challenging for shell-model calculations [1], making measures of collectivity near N=Z=50 ¹⁰⁰Sn quite interesting. We explore collectivity in Z=48, N=58 ¹⁰⁶Cd via Coulomb Excitation. Experimental results for ¹⁰⁶Cd are contradictory: Recent lifetime measurements [2] disagree with NNDC values adopted from a 40 year old Coulomb excitation measurement [3]. B(E2) values derived from [2] disagree with large-scale shell model calculations, questioning the earlier good reproduction of quadrupole collectivity in ¹⁰⁶Cd within the shell model.

The results of a Coulomb excitation measurement of ¹⁰⁶Cd will be presented. The measurement will clarify collectivity in ¹⁰⁶Cd, extend the data to higher-lying states, and add understanding of collectivity towards N=Z=50 ¹⁰⁰Sn.

[1] V. M. Bader et al., Phys. Rev. C 88, 051301(R) (2013)

[2] N. Benczer-Koller et al., Phys. Rev. C 94, 034303 (2016)

[3] M. T. Esat et al., Nucl. Phys. A 274, 237 (1976)