Selective laser ionization of very neutron-rich cadmium isotopes: Decay properties of ${}^{131}{\mathrm{Cd}}_{83}$ and ${}^{132}{\mathrm{Cd}}_{84}$

A chemically selective laser ion source has been applied in a decay study of the very neutron-rich isotopes ${}^{131}\mathrm{Cd}$ and ${}^{132}\mathrm{Cd}$ at CERN/ISOLDE. For the ${\beta }^{-}$ decay of the $N=83\mathrm{}$ nuclide ${}^{131}\mathrm{Cd}$ a surprisingly short half-life of $(68\mathrm{}\pm 3)$ ms and a weak delayed-neutron branch of $P_n=(3.5\mathrm{}\pm 1.0)\%$ were observed. For the $N=84\mathrm{}$ nuclide ${}^{132}\mathrm{Cd}$ a half-life of $(97\mathrm{}\pm 10)$ ms and a $P_n$ value of $(60\mathrm{}\pm 15)\%$ were obtained. Schematic features of both decay schemes are developed. We find that our new data are not reproduced by current global models used for ab initio calculations of $\beta$-decay properties without significant changes.