Beta-delayed neutron emission around doubly magic 78Ni

BRIKEN collaboration operates the world-largest beta-delayed neutron detection array at the BigRIPS fragment separator at RIKEN (Wako, Japan). Multiple experiments including the ones focused on the 78Ni region have been performed profiting from up to 4.3*10$^{\mathrm{11}}$ pps 238U beam at 345 MeV/u. For last experiment focused on 82Cu activity, BRIKEN array was modified to achieve larger gamma efficiency having fragment implantation and beta decay detectors of WASABI array complemented by a position sensitive YSO scintillator developed at the UTK. Isotopes between 61V-69V up to 95Br-97Br were produced and identified. The total rate of identified 78Ni ions during BRIKEN experiments was around 65,000, with about 41,000 ions implanted for decay study. Together with new beta-delayed (multi) neutron branching ratios and half-lives, new data on beta-neutron-gamma correlations help us to analyze the nuclear structure evolution at and beyond N$=$50 shell closure.