In-beam $\gamma $-ray spectroscopy of $^{94}$Ag
Résumé
A recoil-beta-tagging experiment has been performed to study the excited $T=0$ and $T=1$ states in the odd–odd $N=Z$ nucleus $^{94}$Ag, populated via the $^{40}$Ca($^{58}$Ni,1p3n)$^{94}$Ag reaction. The experiment was conducted using the MARA recoil separator and JUROGAM3 array at the Accelerator Laboratory of the University of Jyväskylä. Through correlating fast, high-energy beta decays at the MARA focal plane with prompt $\gamma $ rays emitted at the reaction target, a number of transitions between excited states in $^{94}$Ag have been identified. The timing characteristics of these transitions confirm that they fall within decay sequences that feed the short-lived $T=1$ ground state of $^{94}$Ag. The transitions are proposed to proceed within and between the sets of states with $T=0$ and $T=1$. Possible correspondence between some of these transitions from analog states in $^{94}$Pd has been discussed, and shell-model calculations including multipole and monopole electromagnetic effects have been presented, in order to enable predictions of the decay patterns between the $T=0$ and $T=1$ states and to allow a theoretical set of Coulomb energy differences to be calculated for the $A = 94T=1$ analog states.