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, 86Cu, and 90Ga. This study broadens our understanding of nuclear existence and paves the way for investigating the properties of neutron-rich medium-mass nuclei.