Studies on the exotic structure of neutron-rich nuclei via direct reactions

Abstract

Direct reaction is particularly useful in studying the nuclear structure of neutron-rich nuclei. By the use of the recoiled proton tagging technique, knockout reaction was developed into a clean spectroscopic probe and was applied to the study of the exotic structures of 6He and 8He. The most accurate parameters and related spectroscopic factor was obtained for the ground state of 7He. The Multi-neutron detection technique was also implemented, with which the resonant states of 8He and the corresponding neutron-neutron correlation function were measured. The cluster structure of 12Be was studied via inelastic excitation followed by coincidently recording the decay products, and molecular-like resonant states were observed for α -8He and 6He-6He decaying channels. These states are part of the molecular rotational bands and therefore clearly support the highly clustering structure of 12Be.