Speaker
Description
Nuclei at and beyond 78Ni were studied by means of the RIKEN BigRIPS facility and BRIKEN 3He-based beta-delayed neutron array and Ge clovers [1]. The search for the 3s1/2 neutron orbital down-sloping towards 2d5/2 neutron 81Zn ground state was among the goals. Such 3s1/2 state may trigger halo-like structure in even-Z, odd-N neutron-rich isotopes beyond 78Ni. This halo-like state would eventually originate from loosely bound s-neutron creating an isomeric state at low energy. The beta-delayed neutron decay of 82Cu most likely populates such state in N=51 81Zn, and ultimately the beta-delayed neutron decay of 80Co can populate 3s1/2 state in 79Ni. These s-states would decay to the respective d-ground states with gamma and/or conversion electron emission. The nuclei 82Cu and 80Co were produced and identified in our experiment [1]. I'll discuss the search for N=51 81mZn including recent Isolde attempts.
Supported through the DOE Office of Science grant DOE-AC05-00OR22725
[1] Y. Shimizu, K. Rykaczewski et al. for BRIKEN collaboration “Exploration of neutron-rich isotopes around N = 50 via the in-flight fission of a 345-MeV/nucleon 238U beam”, Progress of Theoretical and Experimental Physics, 033D06, 2026.