Spectroscopy of Beta-delayed Neutron Emitters in the \textsuperscript{78}Ni Region using VANDLE

Beta-delayed neutron emission is a prevalent decay process for neutron-rich isotopes involved in the r-process, affecting the abundance patterns of the isotopes involved. An experiment was performed at the RIKEN Nishina Center aiming at the spectroscopy of the delayed neutron precursors around (27 $\geq$ Z $\geq$ 34) the doubly-magic \textsuperscript{78}Ni using VANDLE digital neutron array, and a segmented YSO based implant detector. The YSO detector has high beta-detection ($\sim$ 80 $\%$) efficiency, and good position and time resolution needed for the reliable time of flight measurements. The presentation will highlight the first results from the ongoing analysis process for the data about the decays of (N$>$50) Ga and Cu isotopes. The results will be compared to the predictions of neutron-emission probabilities (Pn) using a shell model for the strength distribution combined with the neutron-emission model as was done previously to explain the neutron-emission branching ratios for \textsuperscript{86, 87}Ga by Yokoyama et al., 2019.