β-Decay Feeding Intensity Distribution of ⁹³Rb

Many astrophysical processes require as input beta-decay properties of exotic nuclei. In many cases, such as in the r-process, the relevant nuclei are not yet accessible by current facilities, and astrophysical models use theoretical calculations to describe the relevant beta decays. It is, therefore, critical to have complete measurements, where possible, that can be used to constrain theoretical calculations. In the present work we focus on the study of the beta-decay of the neutron-rich isotope 93Rb. A 93Rb beam was produced at the National Superconducting Cyclotron Laboratory (NSCL). 93Rb nuclei were implanted in a mylar tape. The electrons from the β decay were measured in a plastic scintillating barrel-shaped β detector, while the γ rays were detected in the Summing NaI(Tl) (SuN) detector. The β-decay strength function was measured with the technique Total Absorption Spectroscopy. The results are compared to beta-decay models commonly used in astrophysical calculations.