First glimpse of the $N=82$ shell closure below $Z=50$ from masses of neutron-rich cadmium isotopes and isomers

We probe the $N=82$ nuclear shell closure by mass measurements of neutron-rich cadmium isotopes with the ISOLTRAP spectrometer at ISOLDE-CERN. The new mass of $^{132}$Cd offers the first value of the $N=82$, two-neutron shell gap below $Z=50$ and confirms the phenomenon of mutually enhanced magicity at $^{132}$Sn. Using the recently implemented phase-imaging ion-cyclotron-resonance method, the ordering of the low-lying isomers in $^{129}$Cd and their energies are determined. The new experimental findings are used to test large-scale shell-model, mean-field and beyond-mean-field calculations, as well as the ab initio valence-space in-medium similarity renormalization group.

Manea, V., Karthein, J., Atanasov, D., Bender, M., Blaum, K., Cocolios, T. E., ... Zuber, K.

Manea, V||Karthein, J||Atanasov, D||Bender, M||Blaum, K||Cocolios, TE||Eliseev, S||Herlert, A||Holt, JD||Huang, WJ||Litvinov, Yu A||Lunney, D||Menéndez, J||Mougeot, M||Neidherr, D||Schweikhard, L||Schwenk, A||Simonis, J||Welker, A||Wienholtz, F||Zuber, K

First glimpse of the $N=82$ shell closure below $Z=50$ from masses of neutron-rich cadmium isotopes and isomers Institutional Repository Document