Exploration of neutron-rich isotopes around N = 50 via the in-flight fission of a 345-MeV/nucleon 238U beam

Abstract A search for new neutron-rich isotopes beyond Z = 28 and N = 50 was performed using a 345 MeV/nucleon 238U beam at RI Beam Factory in RIKEN Nishina Center. The BigRIPS separator and state-of-the-art radiation detectors were used to efficiently separate and identify the produced nuclei. For the first time, we have observed and determined the production cross sections for eight neutron-rich isotopes 72Cr, 74, 75Mn, 77Fe, 79, 80Co, 85Cu, and 90Ga. This study broadens our understanding of nuclear existence and paves the way for investigating the properties of neutron-rich medium-mass nuclei.