Isomers in the 123Cd and 125Cd decays and level schemes in 123In and 125In.

Abstract

Samples of $^{123}$,125Cd were obtained by on-line mass separator techniques applied to natural U fast-neutron fission products. Special emphasis was devoted to half-life measurements of the $^{123}$,125Cd decays and to the level schemes of $^{123}$,125In. Two half-lives of 2.12\ifmmode\pm\else\textpm\fi{}0.03 s and 1.81\ifmmode\pm\else\textpm\fi{}0.03 s have been measured for decays of $^{123}\mathrm{Cd}$. Also, for decays of $^{125}\mathrm{Cd}$ two half-lives of 0.68\ifmmode\pm\else\textpm\fi{}0.04 s and 0.48\ifmmode\pm\else\textpm\fi{}0.03 s were observed and measured. Four independent level schemes produced by the above-mentioned decays are proposed based upon the present results and previously reported data. The $^{123}\mathrm{In}$ and $^{125}\mathrm{In}$ level schemes are discussed within the hole-vibration coupling formalism, assuming a single hole coupled to the quadrupole surface vibrations of the corresponding $^{124}\mathrm{Sn}$ and $^{126}\mathrm{Sn}$ isotopes. The interaction between the hole and the vibrating core is treated perturbatively within the nuclear field theory formalism.